As I understand it, all it takes to get a POSIX semaphore in windows is to
include <semaphore.h> and link with -lpthread. Windows semaphores are
defined in <windows.h>. Since POSIX semaphores are in libpthread, they
would be "pthread" semaphores. Nonetheless, I think they have a different
flavor. The bulk of pthread functionality is namespaced with a "pthread_",
while semaphore functions are namespaced with "sem_".
.
Pthread_ stuff applies only to threads, created with pthread_create. While
semaphores may apply to independent processes. As far as I recall,
semaphores require interaction with the kernel, while pthread stuff is
contained within the running program. Thus, semaphores are slower.
Back in the stone age, semaphores were *not* a part of the pthread library,
and each vendor provided his own library. This was before the days when
Linux took over the supercomputers and each vendor prepared a proprietary
BSD based OS for his hardware. This takes us back to the point where
semaphores have to talk to the kernel. The windows kernel, IMHO, is not a
trustworthy kernel, so pthread conditions are a better option.
HTH
2013/11/4 Kai Tietz <ktiet...@googlemail.com>
> Hi Edscott,
>
> thanks for testing this. I just have one small question about one
> paragraph.
>
> 2013/11/4 Edscott Wilson <edscott.wilson.gar...@gmail.com>:
> > 2- Local semaphores (shared only between threads). Posix semaphores in
> Mingw
> > seem to be subject to race conditions not present in Linux or FreeBSD.
> When
> > I tried to use them in Windows, libtubo would crash. So I replaced these
> > semaphores with pthread conditions and things worked just fine.
>
> What is a Posix semaphore in Windows? And what is its difference to
> pthread's semaphore?
> I might confused myself, but this paragraph puzzles me. Thanks for
> more detailed description.
>
> Regards,
> Kai
>
>
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Dr. Edscott Wilson Garcia
Applied Mathematics and Computing
Mexican Petroleum Institute
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