linux线程的取消(终止)方法

#include 
#include 
#include 
#include 
#include 


#define THREAD_MAX 4


pthread_mutex_t mutex;
pthread_t thread[THREAD_MAX];


static int tries;
static int started;


void print_it(int *arg)
{
pthread_t tid;
tid = pthread_self();
printf("Thread %lx was canceled on its %d try.\n",tid,*arg);
}


void *Search_Num(int arg)
{
pthread_t tid;
int num;
int k=0,h=0,j;
int ntries;
tid = pthread_self();

/*while(pthread_mutex_trylock(&mutex) == EBUSY)
{
printf("**************busy****************\n");
pthread_testcancel();
}*/
srand(arg);
num = rand()&0xFFFFFF;
//pthread_mutex_unlock(&mutex);

printf("thread num %lx\n",tid);

ntries = 0;
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,NULL);
pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED,NULL);

pthread_cleanup_push((void *)print_it,(void *)&ntries);

while(1)
{
num = (num+1)&0xffffff;
ntries++;

if(arg == num)
{
//只允许一个线程操作此处
while(pthread_mutex_trylock(&mutex) == EBUSY) { 
//一个线程操作后其余线程进入次循环挂起，等待pthread_cancel函数发送cancel信号终止线程
k++;
if(k == 10000)
{
printf("----------2busy2-----------\n");
}

pthread_testcancel();
}
tries = ntries;
//pthread_mutex_unlock(&mutex);  //如果加上这句话，将会有好几个线程找到主函数中设定的值pid
printf("Thread %lx found the number!\n",tid);

for(j = 0;j

Search the num of 6531
-----------i = 0--------------
thread num b6fbcb70
thread num b67bbb70
thread num b5fbab70
thread num b77bdb70
----------thread num b67bbb70-------------
Thread b67bbb70 found the number!
----------thread num b6fbcb70-------------
----------thread num b77bdb70-------------
----------2busy2-----------
----------thread num b5fbab70-------------
----------2busy2-----------
Thread b5fbab70 was canceled on its 1174527 try.
Thread b77bdb70 was canceled on its 1023100 try.
-----------i = 1--------------
Thread b6fbcb70 was canceled on its 1174527 try.
-----------i = 2--------------
-----------i = 3--------------
It took 1174527 tries ot find the number!