Win32 error in C program using openmp and fork()

Sun Jul 21 07:10:00 GMT 2013

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).

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-- 
Larry
_____________________________________________________________________
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