多線程編程之：Linux線程編程

（3）使用實例。

下面的實例是在我們已經很熟悉的實例的基礎上增加線程屬性設置的功能。為了避免不必要的復雜性，這里就創建一個線程，這個線程具有綁定和分離屬性，而且主線程通過一個finish_flag標志變量來獲得線程結束的消息，而并不調用pthread_join()函數。

/*thread_attr.c*/

#include stdio.h>

#include stdlib.h>

#include pthread.h>

#define REPEAT_NUMBER 3 /* 線程中的小任務數 */

#define DELAY_TIME_LEVELS 10.0 /* 小任務之間的最大時間間隔 */

int finish_flag = 0;

void *thrd_func(void *arg)

{

int delay_time = 0;

int count = 0;

printf(Thread is startingn);

for (count = 0; count  REPEAT_NUMBER; count++)

{

delay_time = (int)(rand() * DELAY_TIME_LEVELS/(RAND_MAX)) + 1;

sleep(delay_time);

printf(tThread : job %d delay = %dn, count, delay_time);

}

printf(Thread finishedn);

finish_flag = 1;

pthread_exit(NULL);

}

int main(void)

{

pthread_t thread;

pthread_attr_t attr;

int no = 0, res;

void * thrd_ret;

srand(time(NULL));

/* 初始化線程屬性對象 */

res = pthread_attr_init(attr);

if (res != 0)

{

printf(Create attribute failedn);

exit(res);

}

/* 設置線程綁定屬性 */

res = pthread_attr_setscope(attr, PTHREAD_SCOPE_SYSTEM);

/* 設置線程分離屬性 */

res += pthread_attr_setdetachstate(attr, PTHREAD_CREATE_DETACHED);

if (res != 0)

{

printf(Setting attribute failedn);

exit(res);

}

res = pthread_create(thread, attr, thrd_func, NULL);

if (res != 0)

{

printf(Create thread failedn);

exit(res);

}

/* 釋放線程屬性對象 */

pthread_attr_destroy(attr);

printf(Create tread successn);

while(!finish_flag)

{

printf(Waiting for thread to finish...n);

sleep(2);

}

return 0;

}