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From: Daniel Brown <DDB707 AT bham DOT ac DOT uk>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Win32 error in C program using openmp and fork()
Date: Sat, 20 Jul 2013 19:30:19 +0000
Message-ID: <57302C57257EF2428CCAAF9BA83EC0448222C0EA@mbx08.adf.bham.ac.uk>
Content-Type: text/plain; charset="iso-8859-1"
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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 have tried doing a rebaseall as I had similar error in the past but it
didn't fix it. I have also tried a clean install on a separate Windows
2008 R2 machine which didn't work either.

The version of GCC is 4.7.3 and I am on Windows 8 Professional
64-bit, Cygwin 1.7.20(0.266/5/3).

Thanks,
Daniel

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