下面的程序运行结果怎么会是这样

发布于 2009-09-08 13:14:23 浏览：8881 订阅该版

void thread1_entry(void *param)
{
 while(1)
 {
 rt_kprintf(" Thread1 :delay 1s ");
	 rt_thread_delay(100);

rt_mutex_take(&mutex,RT_WAITING_FOREVER);
	 rt_kprintf(" Thread1 : taken mutex ");
	 rt_thread_delay(500);
	 rt_mutex_release(&mutex);
	 rt_kprintf("thread1:release mutex ");
 }
}
void thread2_entry(void *param)
{
 while(1)
 {
 rt_mutex_take(&mutex,RT_WAITING_FOREVER);
	 rt_kprintf(" Thread2 : taken mutex ");
	 rt_thread_delay(500);
	 rt_mutex_release(&mutex);
	 rt_kprintf("thread2:release mutex ");
 }
}
int application_thread_Create(void)
{
	rt_thread_t init_thread;
	rt_mutex_init(&mutex,"mutext",RT_IPC_FLAG_FIFO);
	init_thread = rt_thread_create("t1",thread1_entry, RT_NULL,512,250,10);
 if(init_thread==RT_NULL)
 rt_kprintf("thread1_entry is created fail");
	rt_thread_startup(init_thread);
	init_thread = rt_thread_create("t2",thread2_entry, RT_NULL,512,200,10);
 if(init_thread==RT_NULL)
 rt_kprintf("thread2_entry is created fail");
 rt_thread_startup(init_thread);

return 0;
}

14 个回答

mgdsun2000 2009-09-08

这家伙很懒，什么也没写！

bernard 2009-09-08

这家伙很懒，什么也没写！

mgdsun2000 2009-09-09

这家伙很懒，什么也没写！

bernard 2009-09-09

这家伙很懒，什么也没写！

mgdsun2000 2009-09-09

这家伙很懒，什么也没写！

bernard 2009-09-09

这家伙很懒，什么也没写！

bernard 2009-09-10

这家伙很懒，什么也没写！

这个问题已经修正，并且针对于mailbox及message queue将采取更为严格的措施，请更新到svn最新版本。

mutex相应的测试代码：

```

/*
 * File      : tc001_thread.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-05-29     Bernard      the first version
 */

#include <rtthread.h>

struct rt_thread thread1;
struct rt_thread thread2;

char thread1_stack[512];
char thread2_stack[512];

struct rt_mutex mutex;

void thread1_entry(void *param)
{
	while(1)
	{
		rt_mutex_take(&mutex, RT_WAITING_FOREVER);
		rt_mutex_take(&mutex, RT_WAITING_FOREVER);

rt_kprintf("thread1: taken mutex
");
		rt_thread_delay(50);

rt_kprintf("thread1: release mutex
");
		rt_mutex_release(&mutex);
		rt_mutex_release(&mutex);
	}
}

void thread2_entry(void *param)
{
	while(1)
	{
		rt_kprintf("thread2: delay 1second
");
		rt_thread_delay(10);

rt_mutex_take(&mutex, RT_WAITING_FOREVER);
		rt_kprintf("thread2: taken mutex
");
		rt_thread_delay(100);
		rt_mutex_release(&mutex);
	}
}

int rt_application_init()
{
	rt_mutex_init(&mutex, "mutext", RT_IPC_FLAG_FIFO);

rt_thread_init(&thread1,
		"thread1",
		thread1_entry, RT_NULL,
		&thread1_stack[0], sizeof(thread1_stack),
		25, 10);

rt_thread_init(&thread2,
		"thread2",
		thread2_entry, RT_NULL,
		&thread2_stack[0], sizeof(thread2_stack),
		20, 7);

rt_thread_startup(&thread1);
	rt_thread_startup(&thread2);

return 0;
}

```

mgdsun2000 2009-09-10

这家伙很懒，什么也没写！

下面是更新库程序后的运行结果。好像还是有问题啊？线程1和线程2还是同时得到了taken mutex  
mutex_thread2_entry: taken mutex
 mutex_thread1_entry :delay 1s
mutex_thread2_entry:release mutex 
 mutex_thread1_entry : taken mutex  [s:188] 
mutex_thread2_entry: taken mutex [s:188] 
mutex_thread1_entry:release mutex
 mutex_thread1_entry :delay 1s
mutex_thread2_entry:release mutex
 mutex_thread1_entry : taken mutex
mutex_thread2_entry: taken mutex
mutex_thread1_entry:release mutex
 mutex_thread1_entry :delay 1s
mutex_thread2_entry:release mutex
 mutex_thread1_entry : taken mutex
mutex_thread2_entry: taken mutex
mutex_thread1_entry:release mutex
 mutex_thread1_entry :delay 1s
mutex_thread2_entry:release mutex
 mutex_thread1_entry : taken mutex
mutex_thread2_entry: taken mutex
mutex_thread1_entry:release mutex
 mutex_thread1_entry :delay 1s
mutex_thread2_entry:release mutex
 mutex_thread1_entry : taken mutex
mutex_thread2_entry: taken mutex
mutex_thread1_entry:release mutex
 mutex_thread1_entry :delay 1s
mutex_thread2_entry:release mutex
 mutex_thread1_entry : taken mutex
mutex_thread2_entry: taken mutex
mutex_thread1_entry:release mutex