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Date: Mon, 22 Jul 2013 10:06:57 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Win32 error in C program using openmp and fork()
Message-ID: <20130722080657.GD2661@calimero.vinschen.de>
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References: <57302C57257EF2428CCAAF9BA83EC0448222C0EA AT mbx08 DOT adf DOT bham DOT ac DOT uk>
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User-Agent: Mutt/1.5.21 (2010-09-15)

On Jul 20 19:30, Daniel Brown wrote:
> Hi,
> 
> So I have some code I am trying to port to Cygwin but I am getting the
> error:
> 
> fatal error in forked process - failed to create new win32 semaphore,
> Win32 error 87
> 
> when calling fork() in a C program when openmp code has been used
> beforehand. I've got the following test code which reduces the problem
> down to as little code as I could:
> 
> #include <stdio.h>
> #include <omp.h>
> #include <sys/types.h>
> 
> int main(void)
> {
>      pid_t childPID;
> 
>      #pragma omp parallel
>      {
>          printf("I'm an openmp thread...\n");
>      }
> 
>      childPID =3D fork();
> 
>      if(childPID >=3D 0) {
>          if(childPID =3D=3D 0) {
>              printf("Child fork\n");
>          } else {
>              printf("Parent fork\n");
>          }
>      } else {
>          printf("Fork failed");
>          return 1;
>      }
> 
>      return 0;
> }
> 
> To build I just use "gcc -fopenmp para.c" and the output I get is...
> 
> I'm an openmp thread...
> I'm an openmp thread...
> I'm an openmp thread...
> I'm an openmp thread...
> Parent fork 0 [main] a 18640 D:\usr\code\c\a.exe: *** fatal error
> in forked process - failed to create new win32 semaphore, Win32 error
> 87

I didn't try with 1.7.20, but with the current 1.7.21 and with the
latest snapshot from http://cygwin.com/snapshots/, on 32 and 64 bit,
and this is what I get on both cases:

  $ uname -r
  1.7.21(0.267/5/3)
  $ gcc -g -fopenmp -o openmp-test openmp-test.c
  $ ./openmp-test
  I'm an openmp thread...
  I'm an openmp thread...
  Parent fork
  Child fork
  $


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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