多线程的创建、退出、等待、删除语法

1、多线程创建pthread_create()的语法



2、多线程退出pthread_exit()的语法



3、多线程等待pthread_join()的语法



4、多线程删除pthread_cancel()的语法



代码分析：

/* thread.c */
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#define THREAD_NUMBER        3                /*线程数*/
#define REPEAT_NUMBER        5                /*每个线程中的小任务数*/
#define DELAY_TIME_LEVELS    10.0            /*小任务之间的最大时间间隔*/

void *thrd_func(void *arg)
{ /* 线程函数例程 */
int thrd_num = (int)arg;
int delay_time = 0;
int count = 0;

printf("Thread %d is starting\n", thrd_num);
for (count = 0; count < REPEAT_NUMBER; count++)
{
delay_time = (int)(rand() * DELAY_TIME_LEVELS/(RAND_MAX)) + 1;
sleep(delay_time);
printf("\tThread %d: job %d delay = %d\n", thrd_num, count, delay_time);
}
printf("Thread %d finished\n", thrd_num);
pthread_exit(NULL);
}
int main(void)
{
pthread_t thread[THREAD_NUMBER];
int no = 0, res;
void * thrd_ret;

srand(time(NULL));

for (no = 0; no < THREAD_NUMBER; no++)
{
/* 创建多线程 */
res = pthread_create(&thread[no], NULL, thrd_func, (void*)no);
if (res != 0)
{
printf("Create thread %d failed\n", no);
exit(res);
}
}
printf("Create treads success\n Waiting for threads to finish...\n");
for (no = 0; no < THREAD_NUMBER; no++)
{
/* 等待线程结束 */
res = pthread_join(thread[no], &thrd_ret);
if (!res)
{
printf("Thread %d joined\n", no);
}
else
{
printf("Thread %d join failed\n", no);
}
}
return 0;
}