[DeviceDrivers] Fix the re-work issue in workqueue.

components/drivers/include/rtdevice.h

@@ -150,8 +150,9 @@ struct rt_data_queue
 /* workqueue implementation */
 struct rt_workqueue
 {
-	rt_list_t   work_list;
-	rt_thread_t work_thread;
+	rt_list_t      work_list;
+	struct rt_work *work_current; /* current work */
+	rt_thread_t    work_thread;
 };
 
 struct rt_work

components/drivers/src/workqueue.c

+/*
+ * File      : workqueue.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-02-27     bernard      fix the re-work issue.
+ */
+
+#include <rthw.h>
 #include <rtthread.h>
 #include <rtdevice.h>
 
 #ifdef RT_USING_HEAP
 static void _workqueue_thread_entry(void* parameter)
 {
-	struct rt_work* work;
-	struct rt_workqueue* queue;
-	
-	queue = (struct rt_workqueue*) parameter;
-	RT_ASSERT(queue != RT_NULL);
-
-	while (1)
-	{
-		if (rt_list_isempty(&(queue->work_list)))
-		{
-			/* no software timer exist, suspend self. */
-			rt_thread_suspend(rt_thread_self());
-			rt_schedule();
-		}
-
-		/* we have work to do with. */
-		rt_enter_critical();
-		work = rt_list_entry(queue->work_list.next, struct rt_work, list);
-		rt_list_remove(&(work->list));
-		rt_exit_critical();
-
-		/* do work */
-		work->work_func(work, work->work_data);
-	}
+    rt_base_t level;
+    struct rt_work* work;
+    struct rt_workqueue* queue;
+
+    queue = (struct rt_workqueue*) parameter;
+    RT_ASSERT(queue != RT_NULL);
+
+    while (1)
+    {
+        if (rt_list_isempty(&(queue->work_list)))
+        {
+            /* no software timer exist, suspend self. */
+            rt_thread_suspend(rt_thread_self());
+            rt_schedule();
+        }
+
+        /* we have work to do with. */
+        level = rt_hw_interrupt_disable();
+        work = rt_list_entry(queue->work_list.next, struct rt_work, list);
+        rt_list_remove(&(work->list));
+        queue->work_current = work;
+        rt_hw_interrupt_enable(level);
+
+        /* do work */
+        work->work_func(work, work->work_data);
+        level = rt_hw_interrupt_disable();
+        /* clean current work */
+        queue->work_current = RT_NULL;
+        rt_hw_interrupt_enable(level);
+    }
 }
 
 struct rt_workqueue *rt_workqueue_create(const char* name, rt_uint16_t stack_size, rt_uint8_t priority)
 {
-	struct rt_workqueue *queue = RT_NULL;
+    struct rt_workqueue *queue = RT_NULL;
 
-	queue = (struct rt_workqueue*)RT_KERNEL_MALLOC(sizeof(struct rt_workqueue));
-	if (queue != RT_NULL)
-	{
+    queue = (struct rt_workqueue*)RT_KERNEL_MALLOC(sizeof(struct rt_workqueue));
+    if (queue != RT_NULL)
+    {
         /* initialize work list */
         rt_list_init(&(queue->work_list));
-        
-		/* create the work thread */
-		queue->work_thread = rt_thread_create(name, _workqueue_thread_entry, queue, stack_size, priority, 10);
-		if (queue->work_thread == RT_NULL)
-		{
-			RT_KERNEL_FREE(queue);
-			return RT_NULL;
-		}
-
-		rt_thread_startup(queue->work_thread);
-	}
-
-	return queue;
+        queue->work_current = RT_NULL;
+
+        /* create the work thread */
+        queue->work_thread = rt_thread_create(name, _workqueue_thread_entry, queue, stack_size, priority, 10);
+        if (queue->work_thread == RT_NULL)
+        {
+            RT_KERNEL_FREE(queue);
+            return RT_NULL;
+        }
+
+        rt_thread_startup(queue->work_thread);
+    }
+
+    return queue;
 }
 
 rt_err_t rt_workqueue_destroy(struct rt_workqueue* queue)
 {
-	RT_ASSERT(queue != RT_NULL);
+    RT_ASSERT(queue != RT_NULL);
 
-	rt_thread_delete(queue->work_thread);
-	RT_KERNEL_FREE(queue);
+    rt_thread_delete(queue->work_thread);
+    RT_KERNEL_FREE(queue);
 
-	return RT_EOK;
+    return RT_EOK;
 }
 
 rt_err_t rt_workqueue_dowork(struct rt_workqueue* queue, struct rt_work* work)
 {
-	RT_ASSERT(queue != RT_NULL);
-	RT_ASSERT(work != RT_NULL);
-
-	rt_enter_critical();
-	/* NOTE: the work MUST be initialized firstly */
-	rt_list_remove(&(work->list));
-
-	rt_list_insert_after(queue->work_list.prev, &(work->list));
-	if (queue->work_thread->stat != RT_THREAD_READY)
-	{
-		rt_exit_critical();
-		/* resume work thread */
-		rt_thread_resume(queue->work_thread);
-		rt_schedule();
-	}
-	else rt_exit_critical();
-
-	return RT_EOK;
+    rt_base_t level;
+    RT_ASSERT(queue != RT_NULL);
+    RT_ASSERT(work != RT_NULL);
+
+    level = rt_hw_interrupt_disable();
+    if (queue->work_current == work)
+    {
+        rt_hw_interrupt_enable(level);
+        return -RT_EBUSY;
+    }
+
+    /* NOTE: the work MUST be initialized firstly */
+    rt_list_remove(&(work->list));
+
+    rt_list_insert_after(queue->work_list.prev, &(work->list));
+    /* whether the workqueue is doing work */
+    if (queue->work_current == RT_NULL)
+    {
+        rt_hw_interrupt_enable(level);
+        /* resume work thread */
+        rt_thread_resume(queue->work_thread);
+        rt_schedule();
+    }
+    else rt_hw_interrupt_enable(level);
+
+    return RT_EOK;
 }
 
 rt_err_t rt_workqueue_critical_work(struct rt_workqueue* queue, struct rt_work* work)
 {
-	RT_ASSERT(queue != RT_NULL);
-	RT_ASSERT(work != RT_NULL);
-
-	rt_enter_critical();
-	/* NOTE: the work MUST be initialized firstly */
-	rt_list_remove(&(work->list));
-
-	rt_list_insert_after(queue->work_list.prev, &(work->list));
-	if (queue->work_thread->stat != RT_THREAD_READY)
-	{
-		rt_exit_critical();
-		/* resume work thread */
-		rt_thread_resume(queue->work_thread);
-		rt_schedule();
-	}
-	else rt_exit_critical();
-
-	return RT_EOK;
+    rt_base_t level;
+    RT_ASSERT(queue != RT_NULL);
+    RT_ASSERT(work != RT_NULL);
+
+    level = rt_hw_interrupt_disable();
+    if (queue->work_current == work)
+    {
+        rt_hw_interrupt_enable(level);
+        return -RT_EBUSY;
+    }
+
+    /* NOTE: the work MUST be initialized firstly */
+    rt_list_remove(&(work->list));
+
+    rt_list_insert_after(queue->work_list.prev, &(work->list));
+    if (queue->work_current == RT_NULL)
+    {
+        rt_hw_interrupt_enable(level);
+        /* resume work thread */
+        rt_thread_resume(queue->work_thread);
+        rt_schedule();
+    }
+    else rt_hw_interrupt_enable(level);
+
+    return RT_EOK;
 }
 
 rt_err_t rt_workqueue_cancel_work(struct rt_workqueue* queue, struct rt_work* work)
 {
-	RT_ASSERT(queue != RT_NULL);
-	RT_ASSERT(work != RT_NULL);
+    rt_base_t level;
+
+    RT_ASSERT(queue != RT_NULL);
+    RT_ASSERT(work != RT_NULL);
 
-	rt_enter_critical();
-	rt_list_remove(&(work->list));
-	rt_exit_critical();
+    level = rt_hw_interrupt_disable();
+    if (queue->work_current == work)
+    {
+        rt_hw_interrupt_enable(level);
+        return -RT_EBUSY;
+    }
+    rt_list_remove(&(work->list));
+    rt_hw_interrupt_enable(level);
 
-	return RT_EOK;
+    return RT_EOK;
 }
 
 rt_err_t rt_workqueue_cancel_all_work(struct rt_workqueue* queue)
 {
-	struct rt_list_node *node, *next;
-	RT_ASSERT(queue != RT_NULL);
-
-	rt_enter_critical();
-	for (node = queue->work_list.next; node != &(queue->work_list); node = next)
-	{
-		next = node->next;
-		rt_list_remove(node);
-	}
-	rt_exit_critical();
-
-	return RT_EOK;
+    struct rt_list_node *node, *next;
+    RT_ASSERT(queue != RT_NULL);
+
+    rt_enter_critical();
+    for (node = queue->work_list.next; node != &(queue->work_list); node = next)
+    {
+        next = node->next;
+        rt_list_remove(node);
+    }
+    rt_exit_critical();
+
+    return RT_EOK;
 }
 
 #endif