简单多线程

原创于 2013-08-10 23:26:41 发布 · 428 阅读

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本文介绍了一个使用C语言实现的多线程程序示例。该程序创建了六个线程，并为每个线程分配了一个参数。每个线程将打印一条消息并随机休眠一段时间后退出。主线程等待所有子线程完成。

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

#define NUM 6

void *thread_function(void *arg);

int main()
{
    int res;
    pthread_t a_thread[NUM];
    void *thread_result;
    int index;

    for (index = 0; index < NUM; ++index) {
        res = pthread_create(&a_thread[index], NULL, thread_function, (void *)index);
        if (res != 0)
        {
            perror("Thread create failed!");
            exit(EXIT_FAILURE);
        }
        sleep(1);
    }

    printf("Waiting for threads to finished...\n");

    for (index = NUM - 1; index >= 0; --index)
    {
        res = pthread_join(a_thread[index], &thread_result);
        if (res == 0)
        {
            printf("Picked up a thread:%d\n", index + 1);
        }
        else
        {
            perror("pthread_join failed\n");
        }
    }

    printf("All done\n");
    
    exit(EXIT_SUCCESS);
}

void *thread_function(void *arg)
{
    int my_number = (int)arg;
    int rand_num;

    printf("thread_function is running. Argument was %d\n", my_number);
    rand_num = 1 + (int)(9.0 * rand()/(RAND_MAX + 1.0));
    sleep(rand_num);
    printf("Bye from %d\n", my_number);
    pthread_exit(NULL);
}