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5685a395
编写于
1月 14, 2013
作者:
P
prife
浏览文件
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电子邮件补丁
差异文件
add some comments and clean code in cpu_port.c
上级
212b7120
变更
1
隐藏空白更改
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并排
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1 changed file
with
59 addition
and
62 deletion
+59
-62
libcpu/sim/posix/cpu_port.c
libcpu/sim/posix/cpu_port.c
+59
-62
未找到文件。
libcpu/sim/posix/cpu_port.c
100755 → 100644
浏览文件 @
5685a395
/*
* author : prife (goprife@gmail.com)
* date : 2013/01/14 01:18:50
* version: v 0.1.0
*/
#include <rtthread.h>
#include <stdio.h>
#include <stdlib.h>
...
...
@@ -10,7 +15,6 @@
//#define TRACE printf
#define TRACE(...)
#define _DEBUG
typedef
struct
_thread
{
...
...
@@ -31,10 +35,11 @@ typedef struct _thread
#define TIMER_TYPE ITIMER_REAL
#define MAX_INTERRUPT_NUM ((unsigned int)sizeof(unsigned int) * 8)
#define INTERRUPT_ENABLE 0
#define INTERRUPT_DISABLE 1
/* interrupt flag, if 1, disable, if 0, enable */
static
long
interrupt_disable_flag
;
/* #define INT_ENABLE 0
* #define INT_DISABLE 1
*/
/* flag in interrupt handling */
rt_uint32_t
rt_interrupt_from_thread
,
rt_interrupt_to_thread
;
rt_uint32_t
rt_thread_switch_interrupt_flag
;
...
...
@@ -181,29 +186,28 @@ rt_uint8_t *rt_hw_stack_init(
return
(
rt_uint8_t
*
)
thread
;
}
static
int
dis_count
;
static
int
en_count
;
/* interrupt contex switch hit, value 1 or 0 */
static
long
int_cs_hit
;
/* TODO: 此函数还没有真正实现 */
rt_base_t
rt_hw_interrupt_disable
(
void
)
{
if
(
ptr_int_mutex
!=
NULL
)
{
// pthread_mutex_lock(ptr_int_mutex); //FIXME
}
long
back
;
/*TODO: It may need to mask the signal */
return
0
;
back
=
interrupt_disable_flag
;
interrupt_disable_flag
=
INTERRUPT_DISABLE
;
/*TODO: It may need to unmask the signal */
dis_count
++
;
return
back
;
}
/* TODO: 此函数还没有真正实现 */
void
rt_hw_interrupt_enable
(
rt_base_t
level
)
{
level
=
level
;
interrupt_disable_flag
=
level
;
if
(
ptr_int_mutex
!=
NULL
)
{
// pthread_mutex_unlock(ptr_int_mutex); //FIXME
}
en_count
++
;
/*TODO: It may need to unmask the signal */
}
...
...
@@ -224,6 +228,7 @@ void rt_hw_context_switch(rt_uint32_t from,
RT_ASSERT
(
from
!=
to
);
#if 0
//TODO: 还需要考虑嵌套切换的情况
if (rt_thread_switch_interrupt_flag != 1)
{
rt_thread_switch_interrupt_flag = 1;
...
...
@@ -242,19 +247,32 @@ void rt_hw_context_switch(rt_uint32_t from,
tid
=
rt_thread_self
();
pid
=
pthread_self
();
/* 注意,只有两种可可能,一种是线程函数中调用此函数,一种是在中断中调用
* 而在中断调用是在主线程的信号处理函数中实现(目前只有tick中断)。
* 即, 只有如下两种可能:
* 1)普通RTT线程间接调用,如rt_thread_delay函数
* 2)或者主线程信号处理函数,如rt_tick_increase中调用
*/
/*
* FIXME: 这段代码应该删除,因为rt_schedule函数中是先关闭中断,然后再开启的
* 开启就会出发PendSV(以stm32为例)中断,cpu_port.c的win32版本可以模拟这种
* 情形,因为它的中断是在主线程代码实现的,而本设计中,切换分为两种情况,
* 1) 普通rtt线程调用rt_thread_delay/rt_sem_take等主动挂起时,即刻实现切换
* 2) 当rt_thread_delay定时到期时,主线程的SIGALRM信号处理函数中实现线程切换
*
* 在第一种情况下,如果添加打开如下代码,由于if中语句为真,会导致失败退出。
*
if (interrupt_disable_flag != 0)
{
printf("dis_count=%d, en_count=%d\n", dis_count, en_count);
printf("interrupt_disable_flag = %d\n", interrupt_disable_flag);
printf("bug! interrupt is disabled! You may forget enable interrupt\n");
exit(EXIT_FAILURE);
}
*/
if
(
pid
!=
mainthread_pid
)
{
/* FIXME: 注意这段代码是在RTT普通线程函数总函数中执行的,
* from线程就是当前rtt线程 */
TRACE
(
"conswitch: P in pid<%x> ,suspend <%s>, resume <%s>!
\n
"
,
(
unsigned
int
)
pid
,
thread_from
->
rtthread
->
name
,
thread_to
->
rtthread
->
name
);
/* from线程就是当前rtt线程 */
/* 确定一下,这两个值一定是相等的! */
RT_ASSERT
(
thread_from
->
pthread
==
pid
);
...
...
@@ -263,14 +281,14 @@ void rt_hw_context_switch(rt_uint32_t from,
sem_post
(
&
thread_to
->
sem
);
/* 挂起from线程, 既然from线程就是当前线程,所以应该直接
* 挂起在这里
*/
* 挂起在这里 */
sem_wait
(
&
thread_from
->
sem
);
}
else
{
/* FIXME: 注意这段代码是在system tick 函数中执行的,
* 即此时位于主线程的SIGALRM信号处理函数中 */
* 即此时位于主线程的SIGALRM信号处理函数中
*/
TRACE
(
"conswitch: S in pid<%x> ,suspend <%s>, resume <%s>!
\n
"
,
(
unsigned
int
)
pid
,
thread_from
->
rtthread
->
name
,
...
...
@@ -293,7 +311,11 @@ void rt_hw_context_switch_to(rt_uint32_t to)
rt_interrupt_from_thread
=
0
;
//set interrupt to 1
rt_thread_switch_interrupt_flag
=
0
;
//<------
rt_thread_switch_interrupt_flag
=
0
;
//TODO: 还需要考虑这个嵌套切换的情况
/* enable interrupt
* note: NOW, there are only one interrupt in simposix: system tick */
rt_hw_interrupt_enable
(
0
);
//start the main thread scheduler
mainthread_scheduler
();
...
...
@@ -315,21 +337,19 @@ static int mainthread_scheduler(void)
mainthread_pid
=
pthread_self
();
TRACE
(
"pid <%08x> mainthread
\n
"
,
(
unsigned
int
)(
mainthread_pid
));
/* register interrupts which is simulated for yield and systick */
//register_interrupt(CPU_INTERRUPT_YIELD, yield_interrupt_isr);
//register_interrupt(CPU_INTERRUPT_TICK, tick_interrupt_isr);
/* install signal handler of system tick */
signal_install
(
SIGALRM
,
mthread_signal_tick
);
/* install signal handler used to suspend itself */
signal_install
(
MSG_SUSPEND
,
thread_switch_handler
);
#if 0
/* create a mutex and condition val, used to indicate interrupts occrue */
ptr_int_mutex = &mutex;
pthread_mutexattr_init(&mutexattr);
pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(ptr_int_mutex, &mutexattr);
pthread_cond_init(&cond_int_hit, NULL);
#endif
/* start timer */
start_sys_timer
();
...
...
@@ -341,18 +361,6 @@ static int mainthread_scheduler(void)
for
(;;)
{
#if 0
pthread_mutex_lock(ptr_int_mutex);
/*Lock mutex and wait for signal. Note that the pthread_cond_wait
*routine will automatically and atomically unlock mutex while it waits.
*/
TRACE("mthread: wait cond val!\n");
pthread_cond_wait(&cond_int_hit, ptr_int_mutex);
TRACE("mthread: got cond val!\n");
pthread_mutex_unlock(ptr_int_mutex);
#endif
//printf("main thread...\n");
sleep
(
1
);
}
...
...
@@ -402,7 +410,13 @@ static void mthread_signal_tick(int sig)
if
(
sig
==
SIGALRM
)
{
TRACE
(
"pid <%x> signal: SIGALRM enter!
\n
"
,
(
unsigned
int
)
pid
);
/* FIXME: 下面这条语句不能打开,打开就会导致失败tick_interrupt_isry
* 永远无法执行
*/
/* if (! interrupt_disable_flag) */
tick_interrupt_isr
();
TRACE
(
"pid <%x> signal: SIGALRM leave!
\n
"
,
(
unsigned
int
)
pid
);
}
else
...
...
@@ -428,20 +442,3 @@ static int tick_interrupt_isr(void)
return
0
;
}
#if 0
static void trigger_interrupt(int index)
{
if ((index < MAX_INTERRUPT_NUM) && ptr_int_mutex != NULL)
{
pthread_mutex_lock(ptr_int_mutex);
cpu_pending_interrupts |= (1 << index);
/* signal the condition val */
pthread_cond_signal(&cond_int_hit);
pthread_mutex_unlock(ptr_int_mutex);
}
}
#endif
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