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re-write the rt_hw_interrupt_enable/disable

This commit is contained in:
prife 2013-01-14 14:14:40 +08:00
parent 5685a395be
commit 7b42f926a0
1 changed files with 89 additions and 76 deletions
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165
libcpu/sim/posix/cpu_port.c
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@ -1,6 +1,6 @@
/*
* author : prife (goprife@gmail.com)
* date : 2013/01/14 01:18:50
* date : 2013/01/14 01:18:50
* version: v 0.1.0
*/
#include <rtthread.h>
@ -186,28 +186,96 @@ rt_uint8_t *rt_hw_stack_init(
return (rt_uint8_t *) thread;
}
static int dis_count;
static int en_count;
/* TODO: 此函数还没有真正实现 */
rt_base_t rt_hw_interrupt_disable(void)
{
long back;
if (ptr_int_mutex == NULL)
{
return 0;
}
pthread_mutex_lock(ptr_int_mutex);
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)
{
struct rt_thread * tid;
pthread_t pid;
thread_t *thread_from;
thread_t *thread_to;
if (ptr_int_mutex == NULL)
return;
interrupt_disable_flag = level;
en_count++;
pthread_mutex_unlock(ptr_int_mutex);
/* 如果已经中断仍然关闭 */
if (interrupt_disable_flag)
{
return;
}
/* 表示当前中断打开, 检查是否有挂起的中断 */
pthread_mutex_lock(ptr_int_mutex);
if (!cpu_pending_interrupts)
{
pthread_mutex_unlock(ptr_int_mutex);
return;
}
thread_from = (thread_t *) rt_interrupt_from_thread;
thread_to = (thread_t *) rt_interrupt_to_thread;
tid = rt_thread_self();
pid = pthread_self();
if (pid != mainthread_pid)
{
/* 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 */
/* 需要检查是否有挂起的中断需要处理 */
TRACE("conswitch: P in pid<%x> ,suspend <%s>, resume <%s>!\n",
(unsigned int)pid,
thread_from->rtthread->name,
thread_to->rtthread->name);
/* 确定一下，这两个值一定是相等的！ */
RT_ASSERT(thread_from->pthread == pid);
/* 唤醒被挂起的线程 */
sem_post(& thread_to ->sem);
cpu_pending_interrupts --;
pthread_mutex_unlock(ptr_int_mutex);
/* 挂起当前的线程 */
sem_wait(& thread_from->sem);
}
else
{
/* 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
*/
TRACE("conswitch: S in pid<%x> ,suspend <%s>, resume <%s>!\n",
(unsigned int)pid,
thread_from->rtthread->name,
thread_to->rtthread->name);
/* 挂起from线程 */
pthread_kill(thread_from->pthread, MSG_SUSPEND);
cpu_pending_interrupts --;
pthread_mutex_unlock(ptr_int_mutex);
/* 唤醒to线程 */
sem_post(& thread_to->sem);
}
/*TODO: It may need to unmask the signal */
}
@ -240,66 +308,12 @@ void rt_hw_context_switch(rt_uint32_t from,
rt_interrupt_from_thread = *((rt_uint32_t *)from);
rt_interrupt_to_thread = *((rt_uint32_t *)to);
thread_from = (thread_t *) rt_interrupt_from_thread;
thread_to = (thread_t *) rt_interrupt_to_thread;
/* FIXME note: now, rt_current_thread is the thread_to! scheduler.c:272 */
tid = rt_thread_self();
pid = pthread_self();
/*
* 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);
/* 确定一下，这两个值一定是相等的！ */
RT_ASSERT(thread_from->pthread == pid);
/* 唤醒to线程 */
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 */
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
*/
TRACE("conswitch: S in pid<%x> ,suspend <%s>, resume <%s>!\n",
(unsigned int)pid,
thread_from->rtthread->name,
thread_to->rtthread->name);
/* 挂起from线程 */
pthread_kill(thread_from->pthread, MSG_SUSPEND);
/* 唤醒to线程 */
sem_post(& thread_to->sem);
}
/* 这个函数只是并不会真正执行中断处理函数，而只是简单的
* 设置一下中断挂起标志位
*/
pthread_mutex_lock(ptr_int_mutex);
cpu_pending_interrupts ++;
pthread_mutex_unlock(ptr_int_mutex);
}
void rt_hw_context_switch_to(rt_uint32_t to)
@ -331,7 +345,6 @@ static int mainthread_scheduler(void)
thread_t *thread_to;
pthread_mutex_t mutex;
pthread_mutexattr_t mutexattr;
unsigned int contex_switch_mask;
/* save the main thread id */
mainthread_pid = pthread_self();
@ -342,14 +355,11 @@ static int mainthread_scheduler(void)
/* 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();
@ -405,17 +415,20 @@ static void start_sys_timer(void)
static void mthread_signal_tick(int sig)
{
int res;
pthread_t pid = pthread_self();
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) */
if (pthread_mutex_trylock(ptr_int_mutex) != 0)
{
TRACE("try lock failed.\n");
return;
}
tick_interrupt_isr();
pthread_mutex_unlock(ptr_int_mutex);
TRACE("pid <%x> signal: SIGALRM leave!\n", (unsigned int)pid);
}