Well I did my testing of semaphores to release a windows version of libtubo
(http://xffm.org/libtubo.html) and these are my two cents.
1- Shared semaphores (shared between heavy weight processes). In Linux, a
shared semaphore must be placed in shared memory. This is easy, since the
shm_ family of functions allow you to map any type of pointer to shared
memory. Windows, on the other hand, CreateFileMapping for shared memory
gives you a file descriptor which is no good for mapping a POSIX semaphore.
In any case, Windows has its own CreateSemaphore function, which most
probably uses CreateFileMapping internally. I opted for a different control
method instead.
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.
2013/10/21 Edscott Wilson <edscott.wilson.gar...@gmail.com>
>
>
>
> 2013/10/21 LRN <lrn1...@gmail.com>
>
>> W32 semaphores[1] are shared by default.
>> mingw-w64 winpthreads use these semaphores internally when pshared is
>> PTHREAD_PROCESS_SHARED, so yes, this is supported (judging by the code;
>> you will have to test it to see if it actually works).
>>
>>
> Will do the testint. I'll let you know what turns up.
>
> Thanks.
>
>
>
>
> --
>
> ------------------------------------------------------------------------------------
> Dr. Edscott Wilson Garcia
> Applied Mathematics and Computing
> Mexican Petroleum Institute
>
--
------------------------------------------------------------------------------------
Dr. Edscott Wilson Garcia
Applied Mathematics and Computing
Mexican Petroleum Institute
------------------------------------------------------------------------------
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