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From:	"Hirokazu Yamamoto" <ocean-city AT m2 DOT ccsnet DOT ne DOT jp>
To:	<cygwin AT cygwin DOT com>
Subject:	crash if fork(2) from another thread
Date:	Sun, 28 Sep 2008 11:16:21 +0900
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# I've post mail, but it didn't show up in
http://www.nabble.com/Cygwin-f12165.html.
# Maybe it was not good to attach a file. So try again...

I'm not familiar with pthread & fork, but I think following code should not
crash. Is this expected behavior?

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

void *thread_func(void* args)
{
    int ret;
    pid_t pid;
    pthread_t thread;

    puts("thread_func");

    pid = fork();

    assert(pid != (pid_t)-1);

    if (pid != 0) /* parent process */
    {
        int status;

        printf("parent process (child pid = %d)\n", pid);

        waitpid(pid, &status, 0);

        puts("parent process end");
    }
    else /* child process */
    {
        puts("child process"); /* crash here */
    }

    return args;
}

int main()
{
    int ret;
    pthread_t thread;

    ret = pthread_create(&thread, NULL, thread_func, NULL);
    assert(ret == 0);

    ret = pthread_join(thread, NULL);
    assert(ret == 0);
}

// built with "gcc main.c -o main.exe"

Thank you.


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