No need to be sorry. Great stuff, this MinGW-w64.
As soon as I cook up some wrapper code and test it in libtubo, I'll post it
for your review.
2013/11/7 LRN <lrn1...@gmail.com>
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> On 07.11.2013 22:34, LRN wrote:
> > On 07.11.2013 22:00, Edscott Wilson wrote:
> >> Ok. So I now I ran more tests. To start with, I replaced the
> >> unnamed process-shared semaphore for a more compatible named
> >> semaphore, which by definition is process-shared. The code works
> >> fine in Linux and FreeBSD. But in MinGW-w64, no such luck.
> >
> >> I tried the toolchain in *mingw-w64-v3.0.0.tar.bz2,
> >> <
> https://sourceforge.net/projects/mingw-w64/files/latest/download?source=files
> >*
> >
> >>
> >
> > and the one in x86_64-4.8.2-release-posix-seh-rt_v3-rev0.7z and the
> > one in
> >> x86_64-4.8.2-release-win32-seh-rt_v3-rev0.7z, all with the same
> >> results on the following code:
> >
> >
> >> sem_t *sem = sem_open(sem_name, O_CREAT|O_EXCL, 0700, 0); if
> >> (sem == SEM_FAILED) { fprintf(stderr, "***Cannot create named
> >> semaphore: %s(%s)\n", sem_name, strerror(errno)); return 0; }
> >
> >> Which produces:
> >
> >> ***Cannot create named semaphore: \Tubo-1300-1-stdout (Function
> >> not implemented)
> >
> >> So my guess is that unnamed semaphores are not implemented
> >> either, because when I try to use them, I invariably get a crash
> >> (instead of the graceful exit shown above).
> >
> > This is the implementation of sem_open in winpthreads:
> >
> > sem_t * sem_open (const char *name, int oflag, mode_t mode,
> > unsigned int value) { sem_result (ENOSYS); return NULL; }
> >
> > So no one even attempted to implement semaphore opening in any way
> > (not just shared semaphore opening). It doesn't mean it's
> > impossible though.
> >
> >
>
> Now that i've read the sem_init() source code in winpthreads
> carefully, i see that sem_init fails with EPERM if pshared is not
> PTHREAD_PROCESS_PRIVATE (which is defined as 0).
> Which means that shared semaphores support was not implemented even at
> initialization part.
>
> Sorry.
>
> - --
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Dr. Edscott Wilson Garcia
Applied Mathematics and Computing
Mexican Petroleum Institute
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