线程彻底删除

发布于 2013-07-10 10:53:22 浏览：4710 订阅该版

在做基础的RTT实验，发现线程不能删干净，源码与实验结果如下：

```
/**  动态线程的创建实验 **/
#define THREAD_MAX 5
static void creat_entry(void* para)
{
    while(1)
    {
        rt_kprintf("thread %d is running.
",para);
        rt_thread_delay(5*RT_TICK_PER_SECOND);
    }
}
static void test_thread_entry(void* parameter)
{
    rt_thread_t tid[THREAD_MAX];
    int i;

for( i = 0; i < THREAD_MAX; i ++)
    {
        tid* = rt_thread_create("creat",creat_entry,(void *)i,512,20,5);
        if(tid* != RT_NULL)
            rt_thread_startup(tid*);
        else
            rt_kprintf("creat %d thread failed.
",i);
    }

rt_thread_delay(16*RT_TICK_PER_SECOND);
    rt_thread_delete(tid[0]);
    rt_thread_delay(6*RT_TICK_PER_SECOND);
    rt_thread_delete(tid[1]);
    rt_thread_delay(6*RT_TICK_PER_SECOND);
    rt_thread_delete(tid[2]);
    rt_thread_delay(6*RT_TICK_PER_SECOND);
    rt_thread_delete(tid[3]);
    rt_thread_delay(6*RT_TICK_PER_SECOND);
    rt_thread_delete(tid[4]);

while(1)
    {
    }

}
```

由test_thread线程创建5个creat线程，并在16s后每隔6s终止并回收一个线程，最终按理说list_thread()后不应该出现creat线程的，但是最终一直存在，不过状态是close。

```
thread 0 is running.
thread 3 is running.
thread 2 is running.
thread 1 is running.
thread 4 is running.
finsh>>list_thread()
 thread  pri  status      sp     stack size max used   left tick  error
-------- ---- ------- ---------- ---------- ---------- ---------- ---
creat    0x14 suspend 0x00000100 0x00000200 0x00000100 0x00000004 000
creat    0x14 suspend 0x00000100 0x00000200 0x00000100 0x00000005 000
creat    0x14 suspend 0x00000100 0x00000200 0x00000100 0x00000005 000
creat    0x14 suspend 0x00000100 0x00000200 0x00000100 0x00000005 000
creat    0x14 suspend 0x00000100 0x00000200 0x00000100 0x00000005 000
test     0x14 suspend 0x00000120 0x00000400 0x00000120 0x00000005 000
tcp_serv 0x14 suspend 0x00000170 0x00000400 0x00000198 0x00000005 000
tcpip    0x0c suspend 0x00000160 0x00000400 0x000001a8 0x00000013 000
etx      0x0f suspend 0x0000011c 0x00000200 0x0000011c 0x00000010 000
erx      0x0f suspend 0x0000011c 0x00000200 0x0000018c 0x00000010 000
tshell   0x14 ready   0x00000110 0x00000800 0x000001e0 0x00000003 -04
phy      0x1e suspend 0x00000118 0x00000200 0x00000150 0x00000002 000
tidle    0x1f ready   0x000000e0 0x00000400 0x000000e0 0x0000001d 000
timer    0x04 suspend 0x000000e0 0x00000200 0x000000e0 0x00000009 000
        0, 0x00000000

thread 1 is running.
thread 2 is running.
thread 3 is running.
thread 4 is running.

thread 3 is running.
thread 2 is running.
thread 4 is running.

thread 3 is running.
thread 4 is running.

thread 4 is running.

```

等到最终状态，再list_thread()

```
 thread  pri  status      sp     stack size max used   left tick  error
-------- ---- ------- ---------- ---------- ---------- ---------- ---
creat    0x14 close   0x00000100 0x00000200 0x00000100 0x00000004 000
test     0x14 ready   0x000000e8 0x00000400 0x00000120 0x00000005 000
tcp_serv 0x14 suspend 0x00000170 0x00000400 0x00000198 0x00000005 000
tcpip    0x0c suspend 0x00000160 0x00000400 0x000001a8 0x00000014 000
etx      0x0f suspend 0x0000011c 0x00000200 0x0000011c 0x00000010 000
erx      0x0f suspend 0x0000011c 0x00000200 0x0000018c 0x0000000f 000
tshell   0x14 ready   0x00000110 0x00000800 0x000001e0 0x00000005 -04
phy      0x1e ready   0x00000118 0x00000200 0x00000150 0x00000002 -02
tidle    0x1f ready   0x000000e0 0x00000400 0x000000e0 0x00000010 000
timer    0x04 suspend 0x000000e0 0x00000200 0x000000e0 0x00000009 000
        0, 0x00000000
```

可以看到留下了一个close状态的"creat"线程。