Re: pthread problem

[Christopher Faylor <cgf-use-the-mailinglist-please at cygwin dot com>]

On Fri, Feb 05, 2010 at 02:00:07PM -0500, Christopher Faylor wrote:
>On Sat, Feb 06, 2010 at 12:13:59AM +0530, Gaurav Sachdeva wrote:
>>Hi,
>>
>>I have written following code -
>>
>>#include<stdio.h>
>>
>>void *thread_func(void *data)
>>{
>>  printf("In thread\n");
>>  pthread_exit(NULL);
>>}
>>
>>int main()
>>{
>>  pthread_t mythread;
>>  int rc;
>>
>>  rc = pthread_create(&mythread, NULL, thread_func, NULL);
>>  if (rc){
>>         printf("ERROR; return code from pthread_create() is %d\n", rc);
>>         exit(-1);
>>      }
>>
>>  printf("In main..\n");
>>
>>  pthread_exit(NULL);
>>}
>>
>>It must print both "In main" and "In thread".
>>But sometimes it prints one of these two and sometimes both.
>>I tried in actual UNIX OS. It always prints both.
>>
>>I also tried in c++ in cygwin, problem exists there also.
>>
>>Is anyone aware of this problem and its solutions?
>
>Looks like a bug in Cygwin.  From my reading of the pthread_exit man
>page, it looks like it should wait for all available threads to exit
>before the process exits.  Unfortunately that doesn't happen.
>
>You can probably fix that by adding a pthread_join() before the
>pthread_exit().
>
>In the meantime, I'll look into fixing this.

This should be fixed in today's snapshot.  Thanks for the test case.

cgf

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