是否确定，从主调用了pthread_exit？ [英] Is it OK to call pthread_exit from main?

问题描述

当我称之为了pthread_exit 从主，程序永远不会终止。我期望程序完成，因为我是在退出程序的唯一线程，但它不工作。似乎挂起。

When I call pthread_exit from main, the program never gets to terminate. I expected the program to finish, since I was exiting the program's only thread, but it doesn't work. It seems hung.

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

int main(int argc, char *argv[])
{
    printf("-one-\n");

    pthread_exit(NULL);

    printf("-two-\n");
}

的Process Explorer 显示，（仅）线程处于等待。DelayExecution 状态

Process Explorer shows that the (only) thread is in Wait:DelayExecution state.

据了pthread_exit 文件：

这个过程应退出退出
  最后一个线程后0地位
  被终止。该行为应
  好象叫实施
  出口（）与螺纹零参数
  终止时间。

The process shall exit with an exit status of 0 after the last thread has been terminated. The behavior shall be as if the implementation called exit() with a zero argument at thread termination time.

我使用的开发-C ++ v4.9.9.2 和的pthreads-win32的v2.8.0.0 （针对联 libpthreadGC2.a ）。

I'm using Dev-C++ v4.9.9.2 and pthreads-win32 v2.8.0.0 (linking against libpthreadGC2.a).

该库似乎是确定（例如，调用 pthread_self 或在pthread_create 从主正常工作）。

The library seems to be OK (for example, calling pthread_self or pthread_create from main works fine).

有什么理由什么我不应该叫了pthread_exit 从主？

Is there any reason for what I'm not supposed to call pthread_exit from main?

推荐答案

好了肯定的法律在Linux实现的​​pthreads的，看到的 pthreads_exit 。它指出

Well its definately legal in the linux implementation of pthreads, see the notes section in pthreads_exit. It states

要允许其他线程继续执行，主线程应该终止
  通过调用pthread_exit（），而不是出口（3）。

To allow other threads to continue execution, the main thread should terminate by calling pthread_exit() rather than exit(3).

此外，看看源$ C ​​$ C <一个href=\"http://sourceware.org/cgi-bin/cvsweb.cgi/pthreads/pthread_exit.c?rev=1.9&content-type=text/x-cvsweb-markup&cvsroot=pthreads-win32\">here （torwads月底）显示，它大致翻译_end​​thread或_endthreadex。这里这些文档只字不提在不调用它的初始线程。

Further, a look at the source code here (torwads the end) shows that it roughly translates to _endthread or _endthreadex. The documentation here for those makes no mention of not calling it in the initial thread.

这篇关于是否确定，从主调用了pthread_exit？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！