mutex例子内部数据探索

发布于 2010-02-01 23:16:27 浏览：4162 订阅该版

在RTT上运行的代码如下：(由CalmArrow提供)
```
#include <rtthread.h>

struct rt_thread thread_mutex1;
struct rt_thread thread_mutex2;

char thread_mutex1_stack[512];
char thread_mutex2_stack[512];

struct rt_mutex mutex;

void thread_mutex1_entry(void *param)
{
	while(1)
	{
		rt_kprintf("thread_mutex1: start to take mutex
");
		rt_mutex_take(&mutex, RT_WAITING_FOREVER);
		//rt_mutex_take(&mutex, RT_WAITING_FOREVER);

rt_kprintf("thread_mutex1: take mutex ok
");
		rt_kprintf("thread_mutex1: start delay 5s
");
		rt_thread_delay(500);
		rt_kprintf("thread_mutex1: delay 5s done
");
		rt_kprintf("thread_mutex1: release mutex
");
		rt_mutex_release(&mutex);
		//rt_mutex_release(&mutex);

}
}

void thread_mutex2_entry(void *param)
{
	while(1)
	{
		rt_kprintf("thread_mutex2: delay 1s
");
		rt_thread_delay(100);

rt_kprintf("thread_mutex2: start to take mutex
");
		rt_mutex_take(&mutex, RT_WAITING_FOREVER);
		rt_kprintf("thread_mutex2: take mutex ok
");
		rt_kprintf("thread_mutex2: start delay 10s
");
		rt_thread_delay(1000);
		rt_kprintf("thread_mutex2: delay 10s done
");
		rt_kprintf("thread_mutex2: release mutex
");
		rt_mutex_release(&mutex);
	}
}

void mutex_test(void)
{
	rt_mutex_init(&mutex, "mutext", RT_IPC_FLAG_FIFO);

rt_thread_init(&thread_mutex1,
		"m1",
		thread_mutex1_entry, RT_NULL,
		&thread_mutex1_stack[0], sizeof(thread_mutex1_stack),
		25, 10);

rt_thread_init(&thread_mutex2,
		"m2",
		thread_mutex2_entry, RT_NULL,
		&thread_mutex2_stack[0], sizeof(thread_mutex2_stack),
		23, 7);

rt_thread_startup(&thread_mutex1);
	rt_thread_startup(&thread_mutex2);

}

int rt_application_init()
{
	mutex_test();
    return 0;
}
```

注释，如果CalmArrow有时间可以加上一些。

3 个回答

bernard 2010-02-01

这家伙很懒，什么也没写！

再然后是用实时监视工具抓取的内部数据：
(可用于系统运行状态的分析，这里的时间精度比较低，直接采用OS Tick，最好是采用32678的定时器精度。)

\ | /
- RT - Thread Operating System
 / | \ 0.3.0 build Feb  1 2010
 2006 - 2009 Copyright by rt-thread team
semaphore objct heap:0x200007d0 attached
mutex objct mutext:0x200005a4 attached
thread objct m1:0x200000a4 attached
timer objct m1:0x200000f4 attached
thread objct m2:0x20000124 attached
timer objct m2:0x20000174 attached
thread objct tidle:0x200005d0 attached
timer objct tidle:0x20000620 attached
thread_mutex2: delay 1s
start timer object:m2
[00000000]switch from:m2 to:m1
thread_mutex1: start to take mutex
try to take mutex objct:mutext
take mutex objct:mutext
thread_mutex1: take mutex ok
thread_mutex1: start delay 5s
start timer object:m1
[00000000]switch from:m1 to:tidle
[00000100]switch from:tidle to:m2
thread_mutex2: start to take mutex
try to take mutex objct:mutext
[00000100]switch from:m2 to:tidle
[00000500]switch from:tidle to:m1
thread_mutex1: delay 5s done
thread_mutex1: release mutex
put mutex objct:mutext
[00000500]switch from:m1 to:m2
take mutex objct:mutext
thread_mutex2: take mutex ok
thread_mutex2: start delay 10s
start timer object:m2
[00000500]switch from:m2 to:m1
thread_mutex1: start to take mutex
try to take mutex objct:mutext
[00000500]switch from:m1 to:tidle
[00001500]switch from:tidle to:m2
thread_mutex2: delay 10s done
thread_mutex2: release mutex
put mutex objct:mutext
thread_mutex2: delay 1s
start timer object:m2
[00001500]switch from:m2 to:m1
take mutex objct:mutext
thread_mutex1: take mutex ok
thread_mutex1: start delay 5s
start timer object:m1
[00001500]switch from:m1 to:tidle
[00001600]switch from:tidle to:m2
thread_mutex2: start to take mutex
try to take mutex objct:mutext
[00001600]switch from:m2 to:tidle
[00002000]switch from:tidle to:m1
thread_mutex1: delay 5s done
thread_mutex1: release mutex
put mutex objct:mutext
[00002000]switch from:m1 to:m2
take mutex objct:mutext
thread_mutex2: take mutex ok
thread_mutex2: start delay 10s
start timer object:m2
[00002000]switch from:m2 to:m1
thread_mutex1: start to take mutex
try to take mutex objct:mutext
[00002000]switch from:m1 to:tidle
[00003000]switch from:tidle to:m2
thread_mutex2: delay 10s done
thread_mutex2: release mutex
put mutex objct:mutext
thread_mutex2: delay 1s
start timer object:m2
[00003000]switch from:m2 to:m1
take mutex objct:mutext
thread_mutex1: take mutex ok
thread_mutex1: start delay 5s
start timer object:m1
[00003000]switch from:m1 to:tidle
[00003100]switch from:tidle to:m2
thread_mutex2: start to take mutex
try to take mutex objct:mutext
[00003100]switch from:m2 to:tidle
[00003500]switch from:tidle to:m1
thread_mutex1: delay 5s done
thread_mutex1: release mutex
put mutex objct:mutext
[00003500]switch from:m1 to:m2
take mutex objct:mutext
thread_mutex2: take mutex ok
thread_mutex2: start delay 10s
start timer object:m2
[00003500]switch from:m2 to:m1
thread_mutex1: start to take mutex
try to take mutex objct:mutext
[00003500]switch from:m1 to:tidle
[00004500]switch from:tidle to:m2
thread_mutex2: delay 10s done
thread_mutex2: release mutex
put mutex objct:mutext
thread_mutex2: delay 1s
start timer object:m2
[00004500]switch from:m2 to:m1
take mutex objct:mutext
thread_mutex1: take mutex ok
thread_mutex1: start delay 5s
start timer object:m1
[00004500]switch from:m1 to:tidle
[00004600]switch from:tidle to:m2
thread_mutex2: start to take mutex
try to take mutex objct:mutext
[00004600]switch from:m2 to:tidle
[00005000]switch from:tidle to:m1
thread_mutex1: delay 5s done
thread_mutex1: release mutex
put mutex objct:mutext
[00005000]switch from:m1 to:m2
take mutex objct:mutext
thread_mutex2: take mutex ok
thread_mutex2: start delay 10s
start timer object:m2
[00005000]switch from:m2 to:m1
thread_mutex1: start to take mutex
try to take mutex objct:mutext
[00005000]switch from:m1 to:tidle
[00006000]switch from:tidle to:m2
thread_mutex2: delay 10s done
thread_mutex2: release mutex
put mutex objct:mutext
thread_mutex2: delay 1s
start timer object:m2
[00006000]switch from:m2 to:m1
take mutex objct:mutext
thread_mutex1: take mutex ok
thread_mutex1: start delay 5s
start timer object:m1
[00006000]switch from:m1 to:tidle
[00006100]switch from:tidle to:m2
thread_mutex2: start to take mutex
try to take mutex objct:mutext
[00006100]switch from:m2 to:tidle
[00006500]switch from:tidle to:m1
thread_mutex1: delay 5s done
thread_mutex1: release mutex
put mutex objct:mutext
[00006500]switch from:m1 to:m2
take mutex objct:mutext
thread_mutex2: take mutex ok
thread_mutex2: start delay 10s
start timer object:m2
[00006500]switch from:m2 to:m1
thread_mutex1: start to take mutex
try to take mutex objct:mutext
[00006500]switch from:m1 to:tidle
[00007500]switch from:tidle to:m2

总计抓取了10帧。