ipc.c 60.7 KB
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/*
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 * Copyright (c) 2006-2018, RT-Thread Development Team
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 *
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 * SPDX-License-Identifier: Apache-2.0
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 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-03-14     Bernard      the first version
 * 2006-04-25     Bernard      implement semaphore
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 * 2006-05-03     Bernard      add RT_IPC_DEBUG
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 *                             modify the type of IPC waiting time to rt_int32_t
 * 2006-05-10     Bernard      fix the semaphore take bug and add IPC object
 * 2006-05-12     Bernard      implement mailbox and message queue
 * 2006-05-20     Bernard      implement mutex
 * 2006-05-23     Bernard      implement fast event
 * 2006-05-24     Bernard      implement event
 * 2006-06-03     Bernard      fix the thread timer init bug
 * 2006-06-05     Bernard      fix the mutex release bug
 * 2006-06-07     Bernard      fix the message queue send bug
 * 2006-08-04     Bernard      add hook support
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 * 2009-05-21     Yi.qiu       fix the sem release bug
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 * 2009-07-18     Bernard      fix the event clear bug
 * 2009-09-09     Bernard      remove fast event and fix ipc release bug
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 * 2009-10-10     Bernard      change semaphore and mutex value to unsigned value
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 * 2009-10-25     Bernard      change the mb/mq receive timeout to 0 if the
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 *                             re-calculated delta tick is a negative number.
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 * 2009-12-16     Bernard      fix the rt_ipc_object_suspend issue when IPC flag
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 *                             is RT_IPC_FLAG_PRIO
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 * 2010-01-20     mbbill       remove rt_ipc_object_decrease function.
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 * 2010-04-20     Bernard      move memcpy outside interrupt disable in mq
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 * 2010-10-26     yi.qiu       add module support in rt_mp_delete and rt_mq_delete
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 * 2010-11-10     Bernard      add IPC reset command implementation.
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 * 2011-12-18     Bernard      add more parameter checking in message queue
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 * 2013-09-14     Grissiom     add an option check in rt_event_recv
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 * 2018-10-02     Bernard      add 64bit support for mailbox
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 */

#include <rtthread.h>
#include <rthw.h>

#ifdef RT_USING_HOOK
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extern void (*rt_object_trytake_hook)(struct rt_object *object);
extern void (*rt_object_take_hook)(struct rt_object *object);
extern void (*rt_object_put_hook)(struct rt_object *object);
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#endif

/**
 * @addtogroup IPC
 */

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/**@{*/
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/**
 * This function will initialize an IPC object
 *
 * @param ipc the IPC object
 *
 * @return the operation status, RT_EOK on successful
 */
rt_inline rt_err_t rt_ipc_object_init(struct rt_ipc_object *ipc)
{
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    /* init ipc object */
    rt_list_init(&(ipc->suspend_thread));
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    return RT_EOK;
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}

/**
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 * This function will suspend a thread to a specified list. IPC object or some
 * double-queue object (mailbox etc.) contains this kind of list.
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 *
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 * @param list the IPC suspended thread list
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 * @param thread the thread object to be suspended
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 * @param flag the IPC object flag,
 *        which shall be RT_IPC_FLAG_FIFO/RT_IPC_FLAG_PRIO.
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 *
 * @return the operation status, RT_EOK on successful
 */
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rt_inline rt_err_t rt_ipc_list_suspend(rt_list_t        *list,
                                       struct rt_thread *thread,
                                       rt_uint8_t        flag)
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{
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    /* suspend thread */
    rt_thread_suspend(thread);

    switch (flag)
    {
    case RT_IPC_FLAG_FIFO:
        rt_list_insert_before(list, &(thread->tlist));
        break;

    case RT_IPC_FLAG_PRIO:
        {
            struct rt_list_node *n;
            struct rt_thread *sthread;

            /* find a suitable position */
            for (n = list->next; n != list; n = n->next)
            {
                sthread = rt_list_entry(n, struct rt_thread, tlist);

                /* find out */
                if (thread->current_priority < sthread->current_priority)
                {
                    /* insert this thread before the sthread */
                    rt_list_insert_before(&(sthread->tlist), &(thread->tlist));
                    break;
                }
            }

            /*
             * not found a suitable position,
             * append to the end of suspend_thread list
             */
            if (n == list)
                rt_list_insert_before(list, &(thread->tlist));
        }
        break;
    }

    return RT_EOK;
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}

/**
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 * This function will resume the first thread in the list of a IPC object:
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 * - remove the thread from suspend queue of IPC object
 * - put the thread into system ready queue
 *
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 * @param list the thread list
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 *
 * @return the operation status, RT_EOK on successful
 */
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rt_inline rt_err_t rt_ipc_list_resume(rt_list_t *list)
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{
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    struct rt_thread *thread;
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    /* get thread entry */
    thread = rt_list_entry(list->next, struct rt_thread, tlist);
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    RT_DEBUG_LOG(RT_DEBUG_IPC, ("resume thread:%s\n", thread->name));
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    /* resume it */
    rt_thread_resume(thread);
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    return RT_EOK;
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}

/**
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 * This function will resume all suspended threads in a list, including
 * suspend list of IPC object and private list of mailbox etc.
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 *
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 * @param list of the threads to resume
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 *
 * @return the operation status, RT_EOK on successful
 */
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rt_inline rt_err_t rt_ipc_list_resume_all(rt_list_t *list)
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{
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    struct rt_thread *thread;
    register rt_ubase_t temp;

    /* wakeup all suspend threads */
    while (!rt_list_isempty(list))
    {
        /* disable interrupt */
        temp = rt_hw_interrupt_disable();

        /* get next suspend thread */
        thread = rt_list_entry(list->next, struct rt_thread, tlist);
        /* set error code to RT_ERROR */
        thread->error = -RT_ERROR;

        /*
         * resume thread
         * In rt_thread_resume function, it will remove current thread from
         * suspend list
         */
        rt_thread_resume(thread);

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);
    }

    return RT_EOK;
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}

#ifdef RT_USING_SEMAPHORE
/**
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 * This function will initialize a semaphore and put it under control of
 * resource management.
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 *
 * @param sem the semaphore object
 * @param name the name of semaphore
 * @param value the init value of semaphore
 * @param flag the flag of semaphore
 *
 * @return the operation status, RT_EOK on successful
 */
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rt_err_t rt_sem_init(rt_sem_t    sem,
                     const char *name,
                     rt_uint32_t value,
                     rt_uint8_t  flag)
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{
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    RT_ASSERT(sem != RT_NULL);
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    RT_ASSERT(value < 0x10000U);
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    /* init object */
    rt_object_init(&(sem->parent.parent), RT_Object_Class_Semaphore, name);
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    /* init ipc object */
    rt_ipc_object_init(&(sem->parent));
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    /* set init value */
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    sem->value = (rt_uint16_t)value;
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    /* set parent */
    sem->parent.parent.flag = flag;
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    return RT_EOK;
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}
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RTM_EXPORT(rt_sem_init);
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/**
 * This function will detach a semaphore from resource management
 *
 * @param sem the semaphore object
 *
 * @return the operation status, RT_EOK on successful
 *
 * @see rt_sem_delete
 */
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rt_err_t rt_sem_detach(rt_sem_t sem)
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{
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    /* parameter check */
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    RT_ASSERT(sem != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore);
    RT_ASSERT(rt_object_is_systemobject(&sem->parent.parent));
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    /* wakeup all suspend threads */
    rt_ipc_list_resume_all(&(sem->parent.suspend_thread));
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    /* detach semaphore object */
    rt_object_detach(&(sem->parent.parent));
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    return RT_EOK;
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}
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RTM_EXPORT(rt_sem_detach);
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#ifdef RT_USING_HEAP
/**
 * This function will create a semaphore from system resource
 *
 * @param name the name of semaphore
 * @param value the init value of semaphore
 * @param flag the flag of semaphore
 *
 * @return the created semaphore, RT_NULL on error happen
 *
 * @see rt_sem_init
 */
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rt_sem_t rt_sem_create(const char *name, rt_uint32_t value, rt_uint8_t flag)
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{
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    rt_sem_t sem;
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    RT_DEBUG_NOT_IN_INTERRUPT;
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    RT_ASSERT(value < 0x10000U);
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    /* allocate object */
    sem = (rt_sem_t)rt_object_allocate(RT_Object_Class_Semaphore, name);
    if (sem == RT_NULL)
        return sem;
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    /* init ipc object */
    rt_ipc_object_init(&(sem->parent));
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    /* set init value */
    sem->value = value;
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    /* set parent */
    sem->parent.parent.flag = flag;
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    return sem;
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}
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RTM_EXPORT(rt_sem_create);
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/**
 * This function will delete a semaphore object and release the memory
 *
 * @param sem the semaphore object
 *
 * @return the error code
 *
 * @see rt_sem_detach
 */
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rt_err_t rt_sem_delete(rt_sem_t sem)
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{
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    RT_DEBUG_NOT_IN_INTERRUPT;
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    /* parameter check */
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    RT_ASSERT(sem != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore);
    RT_ASSERT(rt_object_is_systemobject(&sem->parent.parent) == RT_FALSE);
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    /* wakeup all suspend threads */
    rt_ipc_list_resume_all(&(sem->parent.suspend_thread));
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    /* delete semaphore object */
    rt_object_delete(&(sem->parent.parent));
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    return RT_EOK;
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}
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RTM_EXPORT(rt_sem_delete);
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#endif

/**
 * This function will take a semaphore, if the semaphore is unavailable, the
 * thread shall wait for a specified time.
 *
 * @param sem the semaphore object
 * @param time the waiting time
 *
 * @return the error code
 */
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rt_err_t rt_sem_take(rt_sem_t sem, rt_int32_t time)
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{
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    register rt_base_t temp;
    struct rt_thread *thread;
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    /* parameter check */
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    RT_ASSERT(sem != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore);
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    RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(sem->parent.parent)));
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    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
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    RT_DEBUG_LOG(RT_DEBUG_IPC, ("thread %s take sem:%s, which value is: %d\n",
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                                rt_thread_self()->name,
                                ((struct rt_object *)sem)->name,
                                sem->value));
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    if (sem->value > 0)
    {
        /* semaphore is available */
        sem->value --;

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);
    }
    else
    {
        /* no waiting, return with timeout */
        if (time == 0)
        {
            rt_hw_interrupt_enable(temp);

            return -RT_ETIMEOUT;
        }
        else
        {
            /* current context checking */
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            RT_DEBUG_IN_THREAD_CONTEXT;
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            /* semaphore is unavailable, push to suspend list */
            /* get current thread */
            thread = rt_thread_self();

            /* reset thread error number */
            thread->error = RT_EOK;

            RT_DEBUG_LOG(RT_DEBUG_IPC, ("sem take: suspend thread - %s\n",
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                                        thread->name));
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            /* suspend thread */
            rt_ipc_list_suspend(&(sem->parent.suspend_thread),
                                thread,
                                sem->parent.parent.flag);
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            /* has waiting time, start thread timer */
            if (time > 0)
            {
                RT_DEBUG_LOG(RT_DEBUG_IPC, ("set thread:%s to timer list\n",
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                                            thread->name));
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                /* reset the timeout of thread timer and start it */
                rt_timer_control(&(thread->thread_timer),
                                 RT_TIMER_CTRL_SET_TIME,
                                 &time);
                rt_timer_start(&(thread->thread_timer));
            }
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            /* enable interrupt */
            rt_hw_interrupt_enable(temp);
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            /* do schedule */
            rt_schedule();
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            if (thread->error != RT_EOK)
            {
                return thread->error;
            }
        }
    }
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    RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(sem->parent.parent)));
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    return RT_EOK;
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}
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RTM_EXPORT(rt_sem_take);
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/**
 * This function will try to take a semaphore and immediately return
 *
 * @param sem the semaphore object
 *
 * @return the error code
 */
rt_err_t rt_sem_trytake(rt_sem_t sem)
{
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    return rt_sem_take(sem, 0);
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}
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RTM_EXPORT(rt_sem_trytake);
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/**
 * This function will release a semaphore, if there are threads suspended on
 * semaphore, it will be waked up.
 *
 * @param sem the semaphore object
 *
 * @return the error code
 */
rt_err_t rt_sem_release(rt_sem_t sem)
{
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    register rt_base_t temp;
    register rt_bool_t need_schedule;
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    /* parameter check */
    RT_ASSERT(sem != RT_NULL);
    RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore);

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    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(sem->parent.parent)));
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    need_schedule = RT_FALSE;
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    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
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    RT_DEBUG_LOG(RT_DEBUG_IPC, ("thread %s releases sem:%s, which value is: %d\n",
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                                rt_thread_self()->name,
                                ((struct rt_object *)sem)->name,
                                sem->value));
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    if (!rt_list_isempty(&sem->parent.suspend_thread))
    {
        /* resume the suspended thread */
        rt_ipc_list_resume(&(sem->parent.suspend_thread));
        need_schedule = RT_TRUE;
    }
    else
        sem->value ++; /* increase value */
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    /* enable interrupt */
    rt_hw_interrupt_enable(temp);
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    /* resume a thread, re-schedule */
    if (need_schedule == RT_TRUE)
        rt_schedule();
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    return RT_EOK;
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}
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RTM_EXPORT(rt_sem_release);
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/**
 * This function can get or set some extra attributions of a semaphore object.
 *
 * @param sem the semaphore object
 * @param cmd the execution command
 * @param arg the execution argument
 *
 * @return the error code
 */
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rt_err_t rt_sem_control(rt_sem_t sem, int cmd, void *arg)
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{
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    rt_ubase_t level;
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    /* parameter check */
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    RT_ASSERT(sem != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore);
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    if (cmd == RT_IPC_CMD_RESET)
    {
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        rt_ubase_t value;
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        /* get value */
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        value = (rt_ubase_t)arg;
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        /* disable interrupt */
        level = rt_hw_interrupt_disable();
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        /* resume all waiting thread */
        rt_ipc_list_resume_all(&sem->parent.suspend_thread);
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        /* set new value */
        sem->value = (rt_uint16_t)value;
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        /* enable interrupt */
        rt_hw_interrupt_enable(level);
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        rt_schedule();
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        return RT_EOK;
    }
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    return -RT_ERROR;
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}
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RTM_EXPORT(rt_sem_control);
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#endif /* end of RT_USING_SEMAPHORE */

#ifdef RT_USING_MUTEX
/**
 * This function will initialize a mutex and put it under control of resource
 * management.
 *
 * @param mutex the mutex object
 * @param name the name of mutex
 * @param flag the flag of mutex
 *
 * @return the operation status, RT_EOK on successful
 */
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rt_err_t rt_mutex_init(rt_mutex_t mutex, const char *name, rt_uint8_t flag)
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{
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    /* parameter check */
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    RT_ASSERT(mutex != RT_NULL);
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    /* init object */
    rt_object_init(&(mutex->parent.parent), RT_Object_Class_Mutex, name);
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    /* init ipc object */
    rt_ipc_object_init(&(mutex->parent));
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    mutex->value = 1;
    mutex->owner = RT_NULL;
    mutex->original_priority = 0xFF;
    mutex->hold  = 0;
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    /* set flag */
    mutex->parent.parent.flag = flag;
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    return RT_EOK;
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}
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RTM_EXPORT(rt_mutex_init);
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/**
 * This function will detach a mutex from resource management
 *
 * @param mutex the mutex object
 *
 * @return the operation status, RT_EOK on successful
 *
 * @see rt_mutex_delete
 */
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rt_err_t rt_mutex_detach(rt_mutex_t mutex)
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{
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    /* parameter check */
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    RT_ASSERT(mutex != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);
    RT_ASSERT(rt_object_is_systemobject(&mutex->parent.parent));
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    /* wakeup all suspend threads */
    rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
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    /* detach semaphore object */
    rt_object_detach(&(mutex->parent.parent));
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    return RT_EOK;
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}
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RTM_EXPORT(rt_mutex_detach);
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#ifdef RT_USING_HEAP
/**
 * This function will create a mutex from system resource
 *
 * @param name the name of mutex
 * @param flag the flag of mutex
 *
 * @return the created mutex, RT_NULL on error happen
 *
 * @see rt_mutex_init
 */
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rt_mutex_t rt_mutex_create(const char *name, rt_uint8_t flag)
590
{
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    struct rt_mutex *mutex;
592

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    RT_DEBUG_NOT_IN_INTERRUPT;
594

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    /* allocate object */
    mutex = (rt_mutex_t)rt_object_allocate(RT_Object_Class_Mutex, name);
    if (mutex == RT_NULL)
        return mutex;
599

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    /* init ipc object */
    rt_ipc_object_init(&(mutex->parent));
602

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    mutex->value              = 1;
    mutex->owner              = RT_NULL;
    mutex->original_priority  = 0xFF;
    mutex->hold               = 0;
607

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    /* set flag */
    mutex->parent.parent.flag = flag;
610

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    return mutex;
612
}
613
RTM_EXPORT(rt_mutex_create);
614 615 616 617 618 619 620 621 622 623

/**
 * This function will delete a mutex object and release the memory
 *
 * @param mutex the mutex object
 *
 * @return the error code
 *
 * @see rt_mutex_detach
 */
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rt_err_t rt_mutex_delete(rt_mutex_t mutex)
625
{
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    RT_DEBUG_NOT_IN_INTERRUPT;
627

628
    /* parameter check */
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    RT_ASSERT(mutex != RT_NULL);
630 631
    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);
    RT_ASSERT(rt_object_is_systemobject(&mutex->parent.parent) == RT_FALSE);
632

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    /* wakeup all suspend threads */
    rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
635

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    /* delete semaphore object */
    rt_object_delete(&(mutex->parent.parent));
638

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    return RT_EOK;
640
}
641
RTM_EXPORT(rt_mutex_delete);
642 643 644 645 646 647 648 649 650 651 652
#endif

/**
 * This function will take a mutex, if the mutex is unavailable, the
 * thread shall wait for a specified time.
 *
 * @param mutex the mutex object
 * @param time the waiting time
 *
 * @return the error code
 */
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rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t time)
654
{
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    register rt_base_t temp;
    struct rt_thread *thread;
657

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    /* this function must not be used in interrupt even if time = 0 */
    RT_DEBUG_IN_THREAD_CONTEXT;

661
    /* parameter check */
662
    RT_ASSERT(mutex != RT_NULL);
663
    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);
664 665 666

    /* get current thread */
    thread = rt_thread_self();
667

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    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
670

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    RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(mutex->parent.parent)));
672

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    RT_DEBUG_LOG(RT_DEBUG_IPC,
674 675
                 ("mutex_take: current thread %s, mutex value: %d, hold: %d\n",
                  thread->name, mutex->value, mutex->hold));
676

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    /* reset thread error */
    thread->error = RT_EOK;

    if (mutex->owner == thread)
    {
        /* it's the same thread */
        mutex->hold ++;
    }
    else
    {
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__again:
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        /* The value of mutex is 1 in initial status. Therefore, if the
         * value is great than 0, it indicates the mutex is avaible.
         */
        if (mutex->value > 0)
        {
            /* mutex is available */
            mutex->value --;

            /* set mutex owner and original priority */
            mutex->owner             = thread;
            mutex->original_priority = thread->current_priority;
            mutex->hold ++;
        }
        else
        {
            /* no waiting, return with timeout */
            if (time == 0)
            {
                /* set error as timeout */
                thread->error = -RT_ETIMEOUT;

                /* enable interrupt */
                rt_hw_interrupt_enable(temp);

                return -RT_ETIMEOUT;
            }
            else
            {
                /* mutex is unavailable, push to suspend list */
                RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_take: suspend thread: %s\n",
718
                                            thread->name));
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                /* change the owner thread priority of mutex */
                if (thread->current_priority < mutex->owner->current_priority)
                {
                    /* change the owner thread priority */
                    rt_thread_control(mutex->owner,
                                      RT_THREAD_CTRL_CHANGE_PRIORITY,
                                      &thread->current_priority);
                }

                /* suspend current thread */
                rt_ipc_list_suspend(&(mutex->parent.suspend_thread),
                                    thread,
                                    mutex->parent.parent.flag);

                /* has waiting time, start thread timer */
                if (time > 0)
                {
                    RT_DEBUG_LOG(RT_DEBUG_IPC,
738 739
                                 ("mutex_take: start the timer of thread:%s\n",
                                  thread->name));
740

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                    /* reset the timeout of thread timer and start it */
                    rt_timer_control(&(thread->thread_timer),
                                     RT_TIMER_CTRL_SET_TIME,
                                     &time);
                    rt_timer_start(&(thread->thread_timer));
                }

                /* enable interrupt */
                rt_hw_interrupt_enable(temp);

                /* do schedule */
                rt_schedule();

                if (thread->error != RT_EOK)
                {
756 757
                    /* interrupt by signal, try it again */
                    if (thread->error == -RT_EINTR) goto __again;
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                    /* return error */
                    return thread->error;
                }
                else
                {
                    /* the mutex is taken successfully. */
                    /* disable interrupt */
                    temp = rt_hw_interrupt_disable();
                }
            }
        }
    }

    /* enable interrupt */
    rt_hw_interrupt_enable(temp);

    RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mutex->parent.parent)));

    return RT_EOK;
778
}
779
RTM_EXPORT(rt_mutex_take);
780 781 782 783 784 785 786 787 788 789 790

/**
 * This function will release a mutex, if there are threads suspended on mutex,
 * it will be waked up.
 *
 * @param mutex the mutex object
 *
 * @return the error code
 */
rt_err_t rt_mutex_release(rt_mutex_t mutex)
{
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    register rt_base_t temp;
    struct rt_thread *thread;
    rt_bool_t need_schedule;
794

795 796 797 798
    /* parameter check */
    RT_ASSERT(mutex != RT_NULL);
    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);

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    need_schedule = RT_FALSE;
800

801 802
    /* only thread could release mutex because we need test the ownership */
    RT_DEBUG_IN_THREAD_CONTEXT;
803

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    /* get current thread */
    thread = rt_thread_self();

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    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
809

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    RT_DEBUG_LOG(RT_DEBUG_IPC,
811 812
                 ("mutex_release:current thread %s, mutex value: %d, hold: %d\n",
                  thread->name, mutex->value, mutex->hold));
813

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    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mutex->parent.parent)));

    /* mutex only can be released by owner */
    if (thread != mutex->owner)
    {
        thread->error = -RT_ERROR;

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);

        return -RT_ERROR;
    }

    /* decrease hold */
    mutex->hold --;
    /* if no hold */
    if (mutex->hold == 0)
    {
        /* change the owner thread to original priority */
        if (mutex->original_priority != mutex->owner->current_priority)
        {
            rt_thread_control(mutex->owner,
                              RT_THREAD_CTRL_CHANGE_PRIORITY,
                              &(mutex->original_priority));
        }

        /* wakeup suspended thread */
        if (!rt_list_isempty(&mutex->parent.suspend_thread))
        {
            /* get suspended thread */
            thread = rt_list_entry(mutex->parent.suspend_thread.next,
                                   struct rt_thread,
                                   tlist);

            RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_release: resume thread: %s\n",
849
                                        thread->name));
850

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            /* set new owner and priority */
            mutex->owner             = thread;
            mutex->original_priority = thread->current_priority;
            mutex->hold ++;
855

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            /* resume thread */
            rt_ipc_list_resume(&(mutex->parent.suspend_thread));
858

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            need_schedule = RT_TRUE;
        }
        else
        {
            /* increase value */
            mutex->value ++;
865

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            /* clear owner */
            mutex->owner             = RT_NULL;
            mutex->original_priority = 0xff;
        }
    }
871

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    /* enable interrupt */
    rt_hw_interrupt_enable(temp);
874

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    /* perform a schedule */
    if (need_schedule == RT_TRUE)
        rt_schedule();
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    return RT_EOK;
880
}
881
RTM_EXPORT(rt_mutex_release);
882 883 884 885 886 887 888 889 890 891

/**
 * This function can get or set some extra attributions of a mutex object.
 *
 * @param mutex the mutex object
 * @param cmd the execution command
 * @param arg the execution argument
 *
 * @return the error code
 */
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rt_err_t rt_mutex_control(rt_mutex_t mutex, int cmd, void *arg)
893
{
894 895 896 897
    /* parameter check */
    RT_ASSERT(mutex != RT_NULL);
    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);

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    return -RT_ERROR;
899
}
900
RTM_EXPORT(rt_mutex_control);
901 902 903 904 905 906 907 908 909 910 911 912 913
#endif /* end of RT_USING_MUTEX */

#ifdef RT_USING_EVENT
/**
 * This function will initialize an event and put it under control of resource
 * management.
 *
 * @param event the event object
 * @param name the name of event
 * @param flag the flag of event
 *
 * @return the operation status, RT_EOK on successful
 */
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rt_err_t rt_event_init(rt_event_t event, const char *name, rt_uint8_t flag)
915
{
916
    /* parameter check */
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    RT_ASSERT(event != RT_NULL);
918

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    /* init object */
    rt_object_init(&(event->parent.parent), RT_Object_Class_Event, name);
921

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    /* set parent flag */
    event->parent.parent.flag = flag;
924

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    /* init ipc object */
    rt_ipc_object_init(&(event->parent));
927

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    /* init event */
    event->set = 0;
930

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    return RT_EOK;
932
}
933
RTM_EXPORT(rt_event_init);
934 935 936 937 938 939 940 941 942 943

/**
 * This function will detach an event object from resource management
 *
 * @param event the event object
 *
 * @return the operation status, RT_EOK on successful
 */
rt_err_t rt_event_detach(rt_event_t event)
{
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    /* parameter check */
    RT_ASSERT(event != RT_NULL);
946 947
    RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event);
    RT_ASSERT(rt_object_is_systemobject(&event->parent.parent));
948

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    /* resume all suspended thread */
    rt_ipc_list_resume_all(&(event->parent.suspend_thread));
951

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    /* detach event object */
    rt_object_detach(&(event->parent.parent));
954

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    return RT_EOK;
956
}
957
RTM_EXPORT(rt_event_detach);
958 959 960 961 962 963 964 965 966 967

#ifdef RT_USING_HEAP
/**
 * This function will create an event object from system resource
 *
 * @param name the name of event
 * @param flag the flag of event
 *
 * @return the created event, RT_NULL on error happen
 */
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rt_event_t rt_event_create(const char *name, rt_uint8_t flag)
969
{
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    rt_event_t event;
971

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    RT_DEBUG_NOT_IN_INTERRUPT;
973

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    /* allocate object */
    event = (rt_event_t)rt_object_allocate(RT_Object_Class_Event, name);
    if (event == RT_NULL)
        return event;
978

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    /* set parent */
    event->parent.parent.flag = flag;
981

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    /* init ipc object */
    rt_ipc_object_init(&(event->parent));
984

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985 986
    /* init event */
    event->set = 0;
987

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    return event;
989
}
990
RTM_EXPORT(rt_event_create);
991 992 993 994 995 996 997 998

/**
 * This function will delete an event object and release the memory
 *
 * @param event the event object
 *
 * @return the error code
 */
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rt_err_t rt_event_delete(rt_event_t event)
1000
{
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    /* parameter check */
    RT_ASSERT(event != RT_NULL);
1003 1004
    RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event);
    RT_ASSERT(rt_object_is_systemobject(&event->parent.parent) == RT_FALSE);
1005

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    RT_DEBUG_NOT_IN_INTERRUPT;
1007

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    /* resume all suspended thread */
    rt_ipc_list_resume_all(&(event->parent.suspend_thread));
1010

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    /* delete event object */
    rt_object_delete(&(event->parent.parent));
1013

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    return RT_EOK;
1015
}
1016
RTM_EXPORT(rt_event_delete);
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
#endif

/**
 * This function will send an event to the event object, if there are threads
 * suspended on event object, it will be waked up.
 *
 * @param event the event object
 * @param set the event set
 *
 * @return the error code
 */
rt_err_t rt_event_send(rt_event_t event, rt_uint32_t set)
{
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    struct rt_list_node *n;
    struct rt_thread *thread;
    register rt_ubase_t level;
    register rt_base_t status;
    rt_bool_t need_schedule;

    /* parameter check */
    RT_ASSERT(event != RT_NULL);
1038 1039
    RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event);

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    if (set == 0)
        return -RT_ERROR;

    need_schedule = RT_FALSE;

    /* disable interrupt */
    level = rt_hw_interrupt_disable();

    /* set event */
    event->set |= set;

1051 1052
    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(event->parent.parent)));
    
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    if (!rt_list_isempty(&event->parent.suspend_thread))
    {
        /* search thread list to resume thread */
        n = event->parent.suspend_thread.next;
        while (n != &(event->parent.suspend_thread))
        {
            /* get thread */
            thread = rt_list_entry(n, struct rt_thread, tlist);

            status = -RT_ERROR;
            if (thread->event_info & RT_EVENT_FLAG_AND)
            {
                if ((thread->event_set & event->set) == thread->event_set)
                {
                    /* received an AND event */
                    status = RT_EOK;
                }
            }
            else if (thread->event_info & RT_EVENT_FLAG_OR)
            {
                if (thread->event_set & event->set)
                {
                    /* save recieved event set */
                    thread->event_set = thread->event_set & event->set;

                    /* received an OR event */
                    status = RT_EOK;
                }
            }

            /* move node to the next */
            n = n->next;

            /* condition is satisfied, resume thread */
            if (status == RT_EOK)
            {
                /* clear event */
                if (thread->event_info & RT_EVENT_FLAG_CLEAR)
                    event->set &= ~thread->event_set;

                /* resume thread, and thread list breaks out */
                rt_thread_resume(thread);

                /* need do a scheduling */
                need_schedule = RT_TRUE;
            }
        }
    }

    /* enable interrupt */
    rt_hw_interrupt_enable(level);

    /* do a schedule */
    if (need_schedule == RT_TRUE)
        rt_schedule();

    return RT_EOK;
1110
}
1111
RTM_EXPORT(rt_event_send);
1112 1113

/**
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 * This function will receive an event from event object, if the event is
 * unavailable, the thread shall wait for a specified time.
1116 1117 1118
 *
 * @param event the fast event object
 * @param set the interested event set
1119 1120
 * @param option the receive option, either RT_EVENT_FLAG_AND or
 *        RT_EVENT_FLAG_OR should be set.
1121
 * @param timeout the waiting time
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 * @param recved the received event, if you don't care, RT_NULL can be set.
1123 1124 1125
 *
 * @return the error code
 */
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rt_err_t rt_event_recv(rt_event_t   event,
                       rt_uint32_t  set,
                       rt_uint8_t   option,
                       rt_int32_t   timeout,
                       rt_uint32_t *recved)
1131
{
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    struct rt_thread *thread;
    register rt_ubase_t level;
    register rt_base_t status;

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    RT_DEBUG_IN_THREAD_CONTEXT;
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    /* parameter check */
    RT_ASSERT(event != RT_NULL);
1140 1141
    RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event);

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    if (set == 0)
        return -RT_ERROR;

    /* init status */
    status = -RT_ERROR;
    /* get current thread */
    thread = rt_thread_self();
    /* reset thread error */
    thread->error = RT_EOK;

    RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(event->parent.parent)));

    /* disable interrupt */
    level = rt_hw_interrupt_disable();

    /* check event set */
    if (option & RT_EVENT_FLAG_AND)
    {
        if ((event->set & set) == set)
            status = RT_EOK;
    }
    else if (option & RT_EVENT_FLAG_OR)
    {
        if (event->set & set)
            status = RT_EOK;
    }
1168 1169 1170 1171 1172
    else
    {
        /* either RT_EVENT_FLAG_AND or RT_EVENT_FLAG_OR should be set */
        RT_ASSERT(0);
    }
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    if (status == RT_EOK)
    {
        /* set received event */
1177
        if (recved)
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            *recved = (event->set & set);
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        /* received event */
        if (option & RT_EVENT_FLAG_CLEAR)
            event->set &= ~set;
    }
    else if (timeout == 0)
    {
        /* no waiting */
        thread->error = -RT_ETIMEOUT;
    }
    else
    {
        /* fill thread event info */
        thread->event_set  = set;
        thread->event_info = option;

        /* put thread to suspended thread list */
        rt_ipc_list_suspend(&(event->parent.suspend_thread),
                            thread,
                            event->parent.parent.flag);

        /* if there is a waiting timeout, active thread timer */
        if (timeout > 0)
        {
            /* reset the timeout of thread timer and start it */
            rt_timer_control(&(thread->thread_timer),
                             RT_TIMER_CTRL_SET_TIME,
                             &timeout);
            rt_timer_start(&(thread->thread_timer));
        }

        /* enable interrupt */
        rt_hw_interrupt_enable(level);

        /* do a schedule */
        rt_schedule();

        if (thread->error != RT_EOK)
        {
            /* return error */
            return thread->error;
        }

        /* received an event, disable interrupt to protect */
        level = rt_hw_interrupt_disable();

        /* set received event */
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        if (recved)
            *recved = thread->event_set;
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    }

    /* enable interrupt */
    rt_hw_interrupt_enable(level);

    RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(event->parent.parent)));

    return thread->error;
1236
}
1237
RTM_EXPORT(rt_event_recv);
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247

/**
 * This function can get or set some extra attributions of an event object.
 *
 * @param event the event object
 * @param cmd the execution command
 * @param arg the execution argument
 *
 * @return the error code
 */
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rt_err_t rt_event_control(rt_event_t event, int cmd, void *arg)
1249
{
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    rt_ubase_t level;
1251

1252 1253 1254 1255
    /* parameter check */
    RT_ASSERT(event != RT_NULL);
    RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event);
    
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    if (cmd == RT_IPC_CMD_RESET)
    {
        /* disable interrupt */
        level = rt_hw_interrupt_disable();
1260

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        /* resume all waiting thread */
        rt_ipc_list_resume_all(&event->parent.suspend_thread);
1263

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        /* init event set */
        event->set = 0;
1266

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        /* enable interrupt */
        rt_hw_interrupt_enable(level);
1269

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        rt_schedule();
1271

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        return RT_EOK;
    }
1274

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    return -RT_ERROR;
1276
}
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RTM_EXPORT(rt_event_control);
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
#endif /* end of RT_USING_EVENT */

#ifdef RT_USING_MAILBOX
/**
 * This function will initialize a mailbox and put it under control of resource
 * management.
 *
 * @param mb the mailbox object
 * @param name the name of mailbox
 * @param msgpool the begin address of buffer to save received mail
 * @param size the size of mailbox
 * @param flag the flag of mailbox
 *
 * @return the operation status, RT_EOK on successful
 */
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rt_err_t rt_mb_init(rt_mailbox_t mb,
                    const char  *name,
                    void        *msgpool,
                    rt_size_t    size,
                    rt_uint8_t   flag)
1298
{
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    RT_ASSERT(mb != RT_NULL);
1300

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    /* init object */
    rt_object_init(&(mb->parent.parent), RT_Object_Class_MailBox, name);
1303

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    /* set parent flag */
    mb->parent.parent.flag = flag;
1306

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    /* init ipc object */
    rt_ipc_object_init(&(mb->parent));
1309

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    /* init mailbox */
    mb->msg_pool   = msgpool;
    mb->size       = size;
    mb->entry      = 0;
    mb->in_offset  = 0;
    mb->out_offset = 0;
1316

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    /* init an additional list of sender suspend thread */
    rt_list_init(&(mb->suspend_sender_thread));
1319

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    return RT_EOK;
1321
}
1322
RTM_EXPORT(rt_mb_init);
1323 1324 1325 1326 1327 1328 1329 1330 1331 1332

/**
 * This function will detach a mailbox from resource management
 *
 * @param mb the mailbox object
 *
 * @return the operation status, RT_EOK on successful
 */
rt_err_t rt_mb_detach(rt_mailbox_t mb)
{
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    /* parameter check */
    RT_ASSERT(mb != RT_NULL);
1335 1336
    RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox);
    RT_ASSERT(rt_object_is_systemobject(&mb->parent.parent));
1337

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    /* resume all suspended thread */
    rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
    /* also resume all mailbox private suspended thread */
    rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
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    /* detach mailbox object */
    rt_object_detach(&(mb->parent.parent));
1345

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    return RT_EOK;
1347
}
1348
RTM_EXPORT(rt_mb_detach);
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359

#ifdef RT_USING_HEAP
/**
 * This function will create a mailbox object from system resource
 *
 * @param name the name of mailbox
 * @param size the size of mailbox
 * @param flag the flag of mailbox
 *
 * @return the created mailbox, RT_NULL on error happen
 */
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rt_mailbox_t rt_mb_create(const char *name, rt_size_t size, rt_uint8_t flag)
1361
{
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    rt_mailbox_t mb;
1363

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    RT_DEBUG_NOT_IN_INTERRUPT;
1365

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    /* allocate object */
    mb = (rt_mailbox_t)rt_object_allocate(RT_Object_Class_MailBox, name);
    if (mb == RT_NULL)
        return mb;
1370

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    /* set parent */
    mb->parent.parent.flag = flag;
1373

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    /* init ipc object */
    rt_ipc_object_init(&(mb->parent));
1376

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    /* init mailbox */
    mb->size     = size;
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    mb->msg_pool = RT_KERNEL_MALLOC(mb->size * sizeof(rt_ubase_t));
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    if (mb->msg_pool == RT_NULL)
    {
        /* delete mailbox object */
        rt_object_delete(&(mb->parent.parent));
1384

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        return RT_NULL;
    }
    mb->entry      = 0;
    mb->in_offset  = 0;
    mb->out_offset = 0;
1390

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    /* init an additional list of sender suspend thread */
    rt_list_init(&(mb->suspend_sender_thread));
1393

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    return mb;
1395
}
1396
RTM_EXPORT(rt_mb_create);
1397 1398 1399 1400 1401 1402 1403 1404

/**
 * This function will delete a mailbox object and release the memory
 *
 * @param mb the mailbox object
 *
 * @return the error code
 */
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rt_err_t rt_mb_delete(rt_mailbox_t mb)
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{
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    RT_DEBUG_NOT_IN_INTERRUPT;
1408

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    /* parameter check */
    RT_ASSERT(mb != RT_NULL);
1411 1412
    RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox);
    RT_ASSERT(rt_object_is_systemobject(&mb->parent.parent) == RT_FALSE);
1413

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    /* resume all suspended thread */
    rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
1416

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    /* also resume all mailbox private suspended thread */
    rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
1419

1420 1421
    /* free mailbox pool */
    RT_KERNEL_FREE(mb->msg_pool);
1422

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    /* delete mailbox object */
    rt_object_delete(&(mb->parent.parent));
1425

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    return RT_EOK;
1427
}
1428
RTM_EXPORT(rt_mb_delete);
1429 1430 1431
#endif

/**
1432 1433
 * This function will send a mail to mailbox object. If the mailbox is full,
 * current thread will be suspended until timeout.
1434 1435 1436
 *
 * @param mb the mailbox object
 * @param value the mail
1437
 * @param timeout the waiting time
1438 1439 1440
 *
 * @return the error code
 */
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rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
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                         rt_ubase_t   value,
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                         rt_int32_t   timeout)
1444
{
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    struct rt_thread *thread;
    register rt_ubase_t temp;
    rt_uint32_t tick_delta;

    /* parameter check */
    RT_ASSERT(mb != RT_NULL);
1451
    RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox);
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1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485

    /* initialize delta tick */
    tick_delta = 0;
    /* get current thread */
    thread = rt_thread_self();

    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mb->parent.parent)));

    /* disable interrupt */
    temp = rt_hw_interrupt_disable();

    /* for non-blocking call */
    if (mb->entry == mb->size && timeout == 0)
    {
        rt_hw_interrupt_enable(temp);

        return -RT_EFULL;
    }

    /* mailbox is full */
    while (mb->entry == mb->size)
    {
        /* reset error number in thread */
        thread->error = RT_EOK;

        /* no waiting, return timeout */
        if (timeout == 0)
        {
            /* enable interrupt */
            rt_hw_interrupt_enable(temp);

            return -RT_EFULL;
        }

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        RT_DEBUG_IN_THREAD_CONTEXT;
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        /* suspend current thread */
        rt_ipc_list_suspend(&(mb->suspend_sender_thread),
                            thread,
                            mb->parent.parent.flag);

        /* has waiting time, start thread timer */
        if (timeout > 0)
        {
            /* get the start tick of timer */
            tick_delta = rt_tick_get();

            RT_DEBUG_LOG(RT_DEBUG_IPC, ("mb_send_wait: start timer of thread:%s\n",
1499
                                        thread->name));
1500

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            /* reset the timeout of thread timer and start it */
            rt_timer_control(&(thread->thread_timer),
                             RT_TIMER_CTRL_SET_TIME,
                             &timeout);
            rt_timer_start(&(thread->thread_timer));
        }

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);

        /* re-schedule */
        rt_schedule();

        /* resume from suspend state */
        if (thread->error != RT_EOK)
        {
            /* return error */
            return thread->error;
        }

        /* disable interrupt */
        temp = rt_hw_interrupt_disable();

        /* if it's not waiting forever and then re-calculate timeout tick */
        if (timeout > 0)
        {
            tick_delta = rt_tick_get() - tick_delta;
            timeout -= tick_delta;
            if (timeout < 0)
                timeout = 0;
        }
    }

    /* set ptr */
    mb->msg_pool[mb->in_offset] = value;
    /* increase input offset */
    ++ mb->in_offset;
    if (mb->in_offset >= mb->size)
        mb->in_offset = 0;
    /* increase message entry */
    mb->entry ++;

    /* resume suspended thread */
    if (!rt_list_isempty(&mb->parent.suspend_thread))
    {
        rt_ipc_list_resume(&(mb->parent.suspend_thread));

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);

        rt_schedule();

        return RT_EOK;
    }

    /* enable interrupt */
    rt_hw_interrupt_enable(temp);

    return RT_EOK;
1560
}
1561
RTM_EXPORT(rt_mb_send_wait);
1562

1563
/**
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1564 1565 1566
 * This function will send a mail to mailbox object, if there are threads
 * suspended on mailbox object, it will be waked up. This function will return
 * immediately, if you want blocking send, use rt_mb_send_wait instead.
1567 1568 1569 1570 1571 1572
 *
 * @param mb the mailbox object
 * @param value the mail
 *
 * @return the error code
 */
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rt_err_t rt_mb_send(rt_mailbox_t mb, rt_ubase_t value)
1574
{
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    return rt_mb_send_wait(mb, value, 0);
1576
}
1577
RTM_EXPORT(rt_mb_send);
1578

1579
/**
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1580 1581
 * This function will receive a mail from mailbox object, if there is no mail
 * in mailbox object, the thread shall wait for a specified time.
1582 1583 1584 1585 1586 1587 1588
 *
 * @param mb the mailbox object
 * @param value the received mail will be saved in
 * @param timeout the waiting time
 *
 * @return the error code
 */
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rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_ubase_t *value, rt_int32_t timeout)
1590
{
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1591 1592 1593 1594 1595 1596
    struct rt_thread *thread;
    register rt_ubase_t temp;
    rt_uint32_t tick_delta;

    /* parameter check */
    RT_ASSERT(mb != RT_NULL);
1597
    RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox);
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1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629

    /* initialize delta tick */
    tick_delta = 0;
    /* get current thread */
    thread = rt_thread_self();

    RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(mb->parent.parent)));

    /* disable interrupt */
    temp = rt_hw_interrupt_disable();

    /* for non-blocking call */
    if (mb->entry == 0 && timeout == 0)
    {
        rt_hw_interrupt_enable(temp);

        return -RT_ETIMEOUT;
    }

    /* mailbox is empty */
    while (mb->entry == 0)
    {
        /* reset error number in thread */
        thread->error = RT_EOK;

        /* no waiting, return timeout */
        if (timeout == 0)
        {
            /* enable interrupt */
            rt_hw_interrupt_enable(temp);

            thread->error = -RT_ETIMEOUT;
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1631 1632 1633
            return -RT_ETIMEOUT;
        }

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        RT_DEBUG_IN_THREAD_CONTEXT;
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1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
        /* suspend current thread */
        rt_ipc_list_suspend(&(mb->parent.suspend_thread),
                            thread,
                            mb->parent.parent.flag);

        /* has waiting time, start thread timer */
        if (timeout > 0)
        {
            /* get the start tick of timer */
            tick_delta = rt_tick_get();

            RT_DEBUG_LOG(RT_DEBUG_IPC, ("mb_recv: start timer of thread:%s\n",
1647
                                        thread->name));
1648

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1649 1650 1651 1652 1653 1654
            /* reset the timeout of thread timer and start it */
            rt_timer_control(&(thread->thread_timer),
                             RT_TIMER_CTRL_SET_TIME,
                             &timeout);
            rt_timer_start(&(thread->thread_timer));
        }
1655

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1656 1657
        /* enable interrupt */
        rt_hw_interrupt_enable(temp);
1658

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1659 1660
        /* re-schedule */
        rt_schedule();
1661

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1662 1663 1664 1665 1666 1667
        /* resume from suspend state */
        if (thread->error != RT_EOK)
        {
            /* return error */
            return thread->error;
        }
1668

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1669 1670
        /* disable interrupt */
        temp = rt_hw_interrupt_disable();
1671

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1672 1673 1674 1675 1676 1677 1678 1679 1680
        /* if it's not waiting forever and then re-calculate timeout tick */
        if (timeout > 0)
        {
            tick_delta = rt_tick_get() - tick_delta;
            timeout -= tick_delta;
            if (timeout < 0)
                timeout = 0;
        }
    }
1681

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1682 1683
    /* fill ptr */
    *value = mb->msg_pool[mb->out_offset];
1684

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1685 1686 1687 1688 1689 1690
    /* increase output offset */
    ++ mb->out_offset;
    if (mb->out_offset >= mb->size)
        mb->out_offset = 0;
    /* decrease message entry */
    mb->entry --;
1691

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1692 1693 1694 1695
    /* resume suspended thread */
    if (!rt_list_isempty(&(mb->suspend_sender_thread)))
    {
        rt_ipc_list_resume(&(mb->suspend_sender_thread));
1696

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1697 1698
        /* enable interrupt */
        rt_hw_interrupt_enable(temp);
1699

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1700
        RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mb->parent.parent)));
1701

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1702
        rt_schedule();
1703

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1704 1705
        return RT_EOK;
    }
1706

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1707 1708
    /* enable interrupt */
    rt_hw_interrupt_enable(temp);
1709

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1710
    RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mb->parent.parent)));
1711

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1712
    return RT_EOK;
1713
}
1714
RTM_EXPORT(rt_mb_recv);
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724

/**
 * This function can get or set some extra attributions of a mailbox object.
 *
 * @param mb the mailbox object
 * @param cmd the execution command
 * @param arg the execution argument
 *
 * @return the error code
 */
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rt_err_t rt_mb_control(rt_mailbox_t mb, int cmd, void *arg)
1726
{
D
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1727
    rt_ubase_t level;
1728 1729

    /* parameter check */
D
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1730
    RT_ASSERT(mb != RT_NULL);
1731
    RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox);
1732

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1733 1734 1735 1736
    if (cmd == RT_IPC_CMD_RESET)
    {
        /* disable interrupt */
        level = rt_hw_interrupt_disable();
1737

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1738 1739 1740 1741
        /* resume all waiting thread */
        rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
        /* also resume all mailbox private suspended thread */
        rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
1742

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1743 1744 1745 1746
        /* re-init mailbox */
        mb->entry      = 0;
        mb->in_offset  = 0;
        mb->out_offset = 0;
1747

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1748 1749
        /* enable interrupt */
        rt_hw_interrupt_enable(level);
1750

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1751
        rt_schedule();
1752

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1753 1754
        return RT_EOK;
    }
1755

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1756
    return -RT_ERROR;
1757
}
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1758
RTM_EXPORT(rt_mb_control);
1759 1760 1761 1762 1763
#endif /* end of RT_USING_MAILBOX */

#ifdef RT_USING_MESSAGEQUEUE
struct rt_mq_message
{
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1764
    struct rt_mq_message *next;
1765 1766 1767
};

/**
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1768 1769
 * This function will initialize a message queue and put it under control of
 * resource management.
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
 *
 * @param mq the message object
 * @param name the name of message queue
 * @param msgpool the beginning address of buffer to save messages
 * @param msg_size the maximum size of message
 * @param pool_size the size of buffer to save messages
 * @param flag the flag of message queue
 *
 * @return the operation status, RT_EOK on successful
 */
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rt_err_t rt_mq_init(rt_mq_t     mq,
                    const char *name,
                    void       *msgpool,
                    rt_size_t   msg_size,
                    rt_size_t   pool_size,
                    rt_uint8_t  flag)
1786
{
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    struct rt_mq_message *head;
    register rt_base_t temp;
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    /* parameter check */
    RT_ASSERT(mq != RT_NULL);
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    /* init object */
    rt_object_init(&(mq->parent.parent), RT_Object_Class_MessageQueue, name);
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    /* set parent flag */
    mq->parent.parent.flag = flag;
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    /* init ipc object */
    rt_ipc_object_init(&(mq->parent));
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    /* set messasge pool */
    mq->msg_pool = msgpool;
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    /* get correct message size */
    mq->msg_size = RT_ALIGN(msg_size, RT_ALIGN_SIZE);
    mq->max_msgs = pool_size / (mq->msg_size + sizeof(struct rt_mq_message));
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    /* init message list */
    mq->msg_queue_head = RT_NULL;
    mq->msg_queue_tail = RT_NULL;
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    /* init message empty list */
    mq->msg_queue_free = RT_NULL;
    for (temp = 0; temp < mq->max_msgs; temp ++)
    {
        head = (struct rt_mq_message *)((rt_uint8_t *)mq->msg_pool +
1818
                                        temp * (mq->msg_size + sizeof(struct rt_mq_message)));
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        head->next = mq->msg_queue_free;
        mq->msg_queue_free = head;
    }
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    /* the initial entry is zero */
    mq->entry = 0;
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    return RT_EOK;
1827
}
1828
RTM_EXPORT(rt_mq_init);
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/**
 * This function will detach a message queue object from resource management
 *
 * @param mq the message queue object
 *
 * @return the operation status, RT_EOK on successful
 */
rt_err_t rt_mq_detach(rt_mq_t mq)
{
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    /* parameter check */
    RT_ASSERT(mq != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue);
    RT_ASSERT(rt_object_is_systemobject(&mq->parent.parent));
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    /* resume all suspended thread */
    rt_ipc_list_resume_all(&mq->parent.suspend_thread);
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    /* detach message queue object */
    rt_object_detach(&(mq->parent.parent));
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    return RT_EOK;
1851
}
1852
RTM_EXPORT(rt_mq_detach);
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#ifdef RT_USING_HEAP
/**
 * This function will create a message queue object from system resource
 *
 * @param name the name of message queue
 * @param msg_size the size of message
 * @param max_msgs the maximum number of message in queue
 * @param flag the flag of message queue
 *
 * @return the created message queue, RT_NULL on error happen
 */
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rt_mq_t rt_mq_create(const char *name,
                     rt_size_t   msg_size,
                     rt_size_t   max_msgs,
                     rt_uint8_t  flag)
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{
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    struct rt_messagequeue *mq;
    struct rt_mq_message *head;
    register rt_base_t temp;

    RT_DEBUG_NOT_IN_INTERRUPT;

    /* allocate object */
    mq = (rt_mq_t)rt_object_allocate(RT_Object_Class_MessageQueue, name);
    if (mq == RT_NULL)
        return mq;

    /* set parent */
    mq->parent.parent.flag = flag;

    /* init ipc object */
    rt_ipc_object_init(&(mq->parent));

    /* init message queue */

    /* get correct message size */
    mq->msg_size = RT_ALIGN(msg_size, RT_ALIGN_SIZE);
    mq->max_msgs = max_msgs;

    /* allocate message pool */
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    mq->msg_pool = RT_KERNEL_MALLOC((mq->msg_size + sizeof(struct rt_mq_message)) * mq->max_msgs);
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    if (mq->msg_pool == RT_NULL)
    {
        rt_mq_delete(mq);

        return RT_NULL;
    }

    /* init message list */
    mq->msg_queue_head = RT_NULL;
    mq->msg_queue_tail = RT_NULL;

    /* init message empty list */
    mq->msg_queue_free = RT_NULL;
    for (temp = 0; temp < mq->max_msgs; temp ++)
    {
        head = (struct rt_mq_message *)((rt_uint8_t *)mq->msg_pool +
1911
                                        temp * (mq->msg_size + sizeof(struct rt_mq_message)));
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        head->next = mq->msg_queue_free;
        mq->msg_queue_free = head;
    }

    /* the initial entry is zero */
    mq->entry = 0;

    return mq;
1920
}
1921
RTM_EXPORT(rt_mq_create);
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/**
 * This function will delete a message queue object and release the memory
 *
 * @param mq the message queue object
 *
 * @return the error code
 */
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rt_err_t rt_mq_delete(rt_mq_t mq)
1931
{
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    RT_DEBUG_NOT_IN_INTERRUPT;
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    /* parameter check */
    RT_ASSERT(mq != RT_NULL);
1936 1937
    RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue);
    RT_ASSERT(rt_object_is_systemobject(&mq->parent.parent) == RT_FALSE);
1938

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    /* resume all suspended thread */
    rt_ipc_list_resume_all(&(mq->parent.suspend_thread));
1941

1942 1943
    /* free message queue pool */
    RT_KERNEL_FREE(mq->msg_pool);
1944

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    /* delete message queue object */
    rt_object_delete(&(mq->parent.parent));
1947

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    return RT_EOK;
1949
}
1950
RTM_EXPORT(rt_mq_delete);
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#endif

/**
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 * This function will send a message to message queue object, if there are
 * threads suspended on message queue object, it will be waked up.
1956 1957 1958 1959 1960 1961 1962
 *
 * @param mq the message queue object
 * @param buffer the message
 * @param size the size of buffer
 *
 * @return the error code
 */
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rt_err_t rt_mq_send(rt_mq_t mq, void *buffer, rt_size_t size)
1964
{
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    register rt_ubase_t temp;
    struct rt_mq_message *msg;

1968
    /* parameter check */
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    RT_ASSERT(mq != RT_NULL);
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    RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue);
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    RT_ASSERT(buffer != RT_NULL);
    RT_ASSERT(size != 0);

    /* greater than one message size */
    if (size > mq->msg_size)
        return -RT_ERROR;

    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mq->parent.parent)));

    /* disable interrupt */
    temp = rt_hw_interrupt_disable();

    /* get a free list, there must be an empty item */
1984
    msg = (struct rt_mq_message *)mq->msg_queue_free;
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    /* message queue is full */
    if (msg == RT_NULL)
    {
        /* enable interrupt */
        rt_hw_interrupt_enable(temp);

        return -RT_EFULL;
    }
    /* move free list pointer */
    mq->msg_queue_free = msg->next;

    /* enable interrupt */
    rt_hw_interrupt_enable(temp);

    /* the msg is the new tailer of list, the next shall be NULL */
    msg->next = RT_NULL;
    /* copy buffer */
    rt_memcpy(msg + 1, buffer, size);

    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
    /* link msg to message queue */
    if (mq->msg_queue_tail != RT_NULL)
    {
        /* if the tail exists, */
        ((struct rt_mq_message *)mq->msg_queue_tail)->next = msg;
    }

    /* set new tail */
    mq->msg_queue_tail = msg;
    /* if the head is empty, set head */
    if (mq->msg_queue_head == RT_NULL)
        mq->msg_queue_head = msg;

    /* increase message entry */
    mq->entry ++;

    /* resume suspended thread */
    if (!rt_list_isempty(&mq->parent.suspend_thread))
    {
        rt_ipc_list_resume(&(mq->parent.suspend_thread));

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);

        rt_schedule();

        return RT_EOK;
    }

    /* enable interrupt */
    rt_hw_interrupt_enable(temp);

    return RT_EOK;
2039
}
2040
RTM_EXPORT(rt_mq_send);
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/**
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 * This function will send an urgent message to message queue object, which
 * means the message will be inserted to the head of message queue. If there
 * are threads suspended on message queue object, it will be waked up.
2046 2047 2048 2049 2050 2051 2052
 *
 * @param mq the message queue object
 * @param buffer the message
 * @param size the size of buffer
 *
 * @return the error code
 */
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rt_err_t rt_mq_urgent(rt_mq_t mq, void *buffer, rt_size_t size)
2054
{
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    register rt_ubase_t temp;
    struct rt_mq_message *msg;
2057

2058
    /* parameter check */
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    RT_ASSERT(mq != RT_NULL);
2060
    RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue);
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    RT_ASSERT(buffer != RT_NULL);
    RT_ASSERT(size != 0);
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    /* greater than one message size */
    if (size > mq->msg_size)
        return -RT_ERROR;
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    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mq->parent.parent)));
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    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
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    /* get a free list, there must be an empty item */
    msg = (struct rt_mq_message *)mq->msg_queue_free;
    /* message queue is full */
    if (msg == RT_NULL)
    {
        /* enable interrupt */
        rt_hw_interrupt_enable(temp);
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        return -RT_EFULL;
    }
    /* move free list pointer */
    mq->msg_queue_free = msg->next;
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    /* enable interrupt */
    rt_hw_interrupt_enable(temp);
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    /* copy buffer */
    rt_memcpy(msg + 1, buffer, size);
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    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
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    /* link msg to the beginning of message queue */
    msg->next = mq->msg_queue_head;
    mq->msg_queue_head = msg;
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    /* if there is no tail */
    if (mq->msg_queue_tail == RT_NULL)
        mq->msg_queue_tail = msg;
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    /* increase message entry */
    mq->entry ++;
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    /* resume suspended thread */
    if (!rt_list_isempty(&mq->parent.suspend_thread))
    {
        rt_ipc_list_resume(&(mq->parent.suspend_thread));
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        /* enable interrupt */
        rt_hw_interrupt_enable(temp);
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        rt_schedule();
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        return RT_EOK;
    }
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    /* enable interrupt */
    rt_hw_interrupt_enable(temp);
2121

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    return RT_EOK;
2123
}
2124
RTM_EXPORT(rt_mq_urgent);
2125 2126

/**
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 * This function will receive a message from message queue object, if there is
 * no message in message queue object, the thread shall wait for a specified
 * time.
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 *
 * @param mq the message queue object
 * @param buffer the received message will be saved in
 * @param size the size of buffer
 * @param timeout the waiting time
 *
 * @return the error code
 */
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rt_err_t rt_mq_recv(rt_mq_t    mq,
                    void      *buffer,
                    rt_size_t  size,
                    rt_int32_t timeout)
2142
{
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    struct rt_thread *thread;
    register rt_ubase_t temp;
    struct rt_mq_message *msg;
    rt_uint32_t tick_delta;

2148
    /* parameter check */
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    RT_ASSERT(mq != RT_NULL);
2150
    RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue);
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    RT_ASSERT(buffer != RT_NULL);
    RT_ASSERT(size != 0);

    /* initialize delta tick */
    tick_delta = 0;
    /* get current thread */
    thread = rt_thread_self();
    RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(mq->parent.parent)));

    /* disable interrupt */
    temp = rt_hw_interrupt_disable();

    /* for non-blocking call */
    if (mq->entry == 0 && timeout == 0)
    {
        rt_hw_interrupt_enable(temp);

        return -RT_ETIMEOUT;
    }

    /* message queue is empty */
    while (mq->entry == 0)
    {
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        RT_DEBUG_IN_THREAD_CONTEXT;
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        /* reset error number in thread */
        thread->error = RT_EOK;

        /* no waiting, return timeout */
        if (timeout == 0)
        {
            /* enable interrupt */
            rt_hw_interrupt_enable(temp);

            thread->error = -RT_ETIMEOUT;

            return -RT_ETIMEOUT;
        }

        /* suspend current thread */
        rt_ipc_list_suspend(&(mq->parent.suspend_thread),
                            thread,
                            mq->parent.parent.flag);

        /* has waiting time, start thread timer */
        if (timeout > 0)
        {
            /* get the start tick of timer */
            tick_delta = rt_tick_get();

            RT_DEBUG_LOG(RT_DEBUG_IPC, ("set thread:%s to timer list\n",
2202
                                        thread->name));
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            /* reset the timeout of thread timer and start it */
            rt_timer_control(&(thread->thread_timer),
                             RT_TIMER_CTRL_SET_TIME,
                             &timeout);
            rt_timer_start(&(thread->thread_timer));
        }

        /* enable interrupt */
        rt_hw_interrupt_enable(temp);

        /* re-schedule */
        rt_schedule();

        /* recv message */
        if (thread->error != RT_EOK)
        {
            /* return error */
            return thread->error;
        }

        /* disable interrupt */
        temp = rt_hw_interrupt_disable();

        /* if it's not waiting forever and then re-calculate timeout tick */
        if (timeout > 0)
        {
            tick_delta = rt_tick_get() - tick_delta;
            timeout -= tick_delta;
            if (timeout < 0)
                timeout = 0;
        }
    }

    /* get message from queue */
    msg = (struct rt_mq_message *)mq->msg_queue_head;

    /* move message queue head */
    mq->msg_queue_head = msg->next;
    /* reach queue tail, set to NULL */
    if (mq->msg_queue_tail == msg)
        mq->msg_queue_tail = RT_NULL;

    /* decrease message entry */
    mq->entry --;

    /* enable interrupt */
    rt_hw_interrupt_enable(temp);

    /* copy message */
    rt_memcpy(buffer, msg + 1, size > mq->msg_size ? mq->msg_size : size);

    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
    /* put message to free list */
    msg->next = (struct rt_mq_message *)mq->msg_queue_free;
    mq->msg_queue_free = msg;
    /* enable interrupt */
    rt_hw_interrupt_enable(temp);

    RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mq->parent.parent)));

    return RT_EOK;
2266
}
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RTM_EXPORT(rt_mq_recv);
2268 2269

/**
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 * This function can get or set some extra attributions of a message queue
 * object.
2272 2273 2274 2275 2276 2277 2278
 *
 * @param mq the message queue object
 * @param cmd the execution command
 * @param arg the execution argument
 *
 * @return the error code
 */
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rt_err_t rt_mq_control(rt_mq_t mq, int cmd, void *arg)
2280
{
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    rt_ubase_t level;
    struct rt_mq_message *msg;
2283

2284
    /* parameter check */
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    RT_ASSERT(mq != RT_NULL);
2286
    RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue);
2287

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    if (cmd == RT_IPC_CMD_RESET)
    {
        /* disable interrupt */
        level = rt_hw_interrupt_disable();
2292

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        /* resume all waiting thread */
        rt_ipc_list_resume_all(&mq->parent.suspend_thread);
2295

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        /* release all message in the queue */
        while (mq->msg_queue_head != RT_NULL)
        {
            /* get message from queue */
            msg = (struct rt_mq_message *)mq->msg_queue_head;
2301

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            /* move message queue head */
            mq->msg_queue_head = msg->next;
            /* reach queue tail, set to NULL */
            if (mq->msg_queue_tail == msg)
                mq->msg_queue_tail = RT_NULL;
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            /* put message to free list */
            msg->next = (struct rt_mq_message *)mq->msg_queue_free;
            mq->msg_queue_free = msg;
        }
2312

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        /* clean entry */
        mq->entry = 0;
2315

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        /* enable interrupt */
        rt_hw_interrupt_enable(level);
2318

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        rt_schedule();
2320

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        return RT_EOK;
    }
2323

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    return -RT_ERROR;
2325
}
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RTM_EXPORT(rt_mq_control);
2327
#endif /* end of RT_USING_MESSAGEQUEUE */
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/**@}*/