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Hirokazu Yamamoto wrote, On 28.9.2008 4:16:
> # 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 */
I think this is not allowed in here. You can only do async-signal-safe stuff
in the child. IO is AFAIK not in that category. Basically, the only thing you
can safely do in the child process is to call exec().
> }
>
> 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.
- --
VH
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