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Re: Win32 error in C program using openmp and fork()
- From: "Larry Hall (Cygwin)" <reply-to-list-only-lh at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Sat, 20 Jul 2013 22:13:56 -0400
- Subject: Re: Win32 error in C program using openmp and fork()
- References: <57302C57257EF2428CCAAF9BA83EC0448222C0EA at mbx08 dot adf dot bham dot ac dot uk>
- Reply-to: cygwin at cygwin dot com
On 7/20/2013 3:30 PM, 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 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).
Please send cygcheck output as requested at the link below:
Problem reports: http://cygwin.com/problems.html
--
Larry
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