On Jan 1 16:16, furrylogical wrote:
> Hello everyone,
>
> Cygwin seems to behave strangely when `printf` is used in threads: if
> the first `printf` encountered occurs in another thread, then the
> first `printf` that occurs in the main function will vanish into thin
> air. The following fragment illustrates this:
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <pthread.h>
>
> void *func(void *arg)
> {
> printf("thread_printf\n");
> return NULL;
> }
>
> int main(int argc, char **argv)
> {
> pthread_t thread;
> pthread_create(&thread, NULL, func, NULL);
> pthread_join(thread, NULL);
> printf("main_printf1\n"); /* This line never gets printed */
> printf("main_printf2\n");
> return 0;
> }
>
> When compiled with `gcc` with no options, the output is:
> thread_printf
> main_printf2
>
> I'm not familiar with the Cygwin codebase. If someone can point me in
> the right direction, I might be able to figure out what is causing
> this issue.
>
> I appreciate the if someone can help me figure this out, though I
> understand it's not exactly a critical issue. Thanks all.
Thanks for the testcase. I could easily reproduce this issue and
track down the cause. I checked in a patch. Please give the next
developer snapshot from http://cygwin.com/snapshots/ a try.
Thanks,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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