linux线程，pthread_join和pthread_cleanup_push和pthread_cleanup_pop

最新推荐文章于 2025-09-15 22:11:34 发布

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本文通过一个具体的示例程序介绍了Linux环境下pthread_join函数的使用方法，以及如何利用pthread_cleanup_push和pthread_cleanup_pop实现线程资源的清理。示例程序展示了如何创建线程，并在主线程中等待子线程结束，同时运用清理例程确保即使发生异常也能正确释放资源。

linux线程，pthread_join和pthread_cleanup_push和pthread_cleanup_pop

pthread_cleanup_push和pthread_cleanup_pop，是堆栈，先进后出。

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

void *thread_function(void *arg);
char message[] = "Hello World";

int main() {
    int res;
    pthread_t a_thread;
    void *thread_result;
    res = pthread_create(&a_thread, NULL, thread_function, (void *)message);
    if (res != 0) {
        perror("Thread creation failed");
        exit(EXIT_FAILURE);
    }   
    printf("Waiting for thread to finish...\n");
    res = pthread_join(a_thread, &thread_result);
    if (res != 0) {
        perror("Thread join failed");
        exit(EXIT_FAILURE);
    }   

    printf("Thread joined, it returned %s\n", (char *)thread_result);
    printf("Message is now %s\n", message);
    exit(EXIT_SUCCESS);
}
void worker1_cleanup(void *arg)
{
    printf("Worker1 cleanup. arg: %s\n", (char *)arg);
}
void worker2_cleanup(void *arg)
{
    printf("Worker2 cleanup. arg: %s\n", (char *)arg);
}
void *thread_function(void *arg)
{
    pthread_cleanup_push(worker1_cleanup, "work1");
    pthread_cleanup_push(worker2_cleanup, "work2");
    printf("thread_function is running. Argument was %s\n", (char *)arg);
    sleep(1);
    pthread_cleanup_pop(1);
    pthread_cleanup_pop(1);
    strcpy(message, "Bye!");
    pthread_exit("Thank you for the CPU time");
}

运行结果：

ueed0@ueed0:~/LinuxC$ make
gcc -Iinc -o getopt_long -Wall -g -DDEBUG getopt_long.c -lpthread -L. -lmath
ueed0@ueed0:~/LinuxC$ ./getopt_long
Waiting for thread to finish...
thread_function is running. Argument was Hello World
Worker2 cleanup. arg: work2
Worker1 cleanup. arg: work1
Thread joined, it returned Thank you for the CPU time
Message is now Bye!