apue程序清单11-4用g++和gcc分别编译后输出结果不一致的问题

firefox_hy

apue第二版P296程序清单11-4，代码在最下方。

将这段代码分别写在11-4.c和11-4.cpp中后
gcc 11-4.c -o prg1 -pthread
g++ 11-4.cpp -o prg2 -pthread

执行./prg1的输出是
thread 1 start
thread 1 push complete
thread 1 exit code 1
thread 2 start
thread 2 push complete
cleanup: thread 2 second handler
cleanup: thread 2 first handler
thread 2 exit code 2
与书中阐述的，“线程如果是通过启动例程返回而终止后，清理处理程序不会被调用”，这个说法一致

而执行./prg2的输出是
thread 1 start
thread 1 push complete
cleanup: thread 1 second handler
cleanup: thread 1 first handler
thread 1 exit code 1
thread 2 start
thread 2 push complete
cleanup: thread 2 second handler
cleanup: thread 2 first handler
thread 2 exit code 2
无论是线程调用pthread_exit退出或者是从启动例程返回，都执行了清理处理程序。

想请教下，造成这结果的原因是什么？？我试过生成汇编文件后对比，有不少地方是不一致的，
不过小菜汇编实在菜，看不懂。。求助下～
#include "apue.h"
#include <pthread.h>

void cleanup(void *arg) {
    printf("cleanup: %s\n", (char *)arg);
}

void *thr_fn1(void *arg) {
    printf("thread 1 start\n");
    char str1[] = "thread 1 first handler";
    char str2[] = "thread 1 second handler";
    pthread_cleanup_push(cleanup, str1);
    pthread_cleanup_push(cleanup, str2);
    printf("thread 1 push complete\n");
    if (arg)
        return ((void *)1);
    pthread_cleanup_pop(0);
    pthread_cleanup_pop(0);
    return ((void *)1);
}

void *thr_fn2(void *arg) {
    printf("thread 2 start\n");
    char str1[] = "thread 2 first handler";
    char str2[] = "thread 2 second handler";
    pthread_cleanup_push(cleanup, str1);
    pthread_cleanup_push(cleanup, str2);
    printf("thread 2 push complete\n");
    if (arg)
        pthread_exit((void *)2);
    pthread_cleanup_pop(0);
    pthread_cleanup_pop(0);
    pthread_exit((void *)2);
}

int main() {
    pthread_t tid1, tid2;
    void *tret;

    pthread_create(&tid1, NULL, thr_fn1, (void *)1);
    sleep(1);
    pthread_create(&tid2, NULL, thr_fn2, (void *)2);

    pthread_join(tid1, &tret);
    printf("thread 1 exit code %d\n", (int)tret);

    pthread_join(tid2, &tret);
    printf("thread 2 exit code %d\n", (int)tret);
    exit(0);
}

hanzhenlll

g++和gcc 同样的C程序编译出来结果不同很正常，G++优化了很多， pthread_create在类成员里使用的时候 还会有void *的错误  很麻烦的.....

MMMIX

回复 1# firefox_hy


    C 的程序为什么要用 C++ 编译器来编译？

firefox_hy

哦哦，谢谢2楼了：）
回3楼，一直习惯用g++编译，以后会视情况选择的了。