38、多线程与进程间通信：管道的使用与实现

多线程与进程间通信：管道的使用与实现

多线程的创建与管理

在多线程编程中，我们可以在一个进程内创建多个执行线程，每个线程共享文件作用域变量。以下是一个创建多个线程并等待它们完成的示例代码：

for(lots_of_threads = 0; lots_of_threads < NUM_THREADS; lots_of_threads++) {
    res = pthread_create(&(a_thread[lots_of_threads]), NULL,
    thread_function, (void *)lots_of_threads);
    if (res != 0) {
        perror("Thread creation failed");
        exit(EXIT_FAILURE);
    }
}
printf("Waiting for threads to finish...\n");
for(lots_of_threads = NUM_THREADS - 1; lots_of_threads >= 0; lots_of_threads--) {
    res = pthread_join(a_thread[lots_of_threads], &thread_result);
    if (res == 0) {
        printf("Picked up a thread\n");
    } else {
        perror("pthread_join failed");
    }
}
printf("All done\n");
exit(EX