Attached you will find code to make semaphores (as defined in <semaphore.h>
work in a way that is compatible with Linux/FreeBSD. This code includes
both named and unnamed semaphores and a working sem_getvalue function (read
Linux man page before using sem_getvalue()).
To use the code, do not include <semaphore.h> in your code, instead "sem.h".
I have prepared it so that with a small patch it can replace the semaphore
code in libwinpthread-1.dll, but don't do this just yet. The code in
barrier.c should be fixed first. The size of sem_t must be available to
programs which include <semaphore.h> since sem_init() should *not*
malloc(). If there is any interest in switching semaphore code to a
compatible usage with Linux/BSD I could work up a patch for barrier.c.
Example usage for semaphores can be found at
https://sourceforge.net/p/xffm/tubo/ci/master/tree/ and will be included in
release 5.0.13.
sem.h:
https://sourceforge.net/p/xffm/tubo/ci/master/tree/src/sem.h
sem.c:
https://sourceforge.net/p/xffm/tubo/ci/master/tree/src/sem.c
In order to debug concurrent threads, trace and error printing is available
with a couple macros defined in this file:
debug.h:
https://sourceforge.net/p/xffm/tubo/ci/master/tree/debug.h
Enjoy.
--
------------------------------------------------------------------------------------
Dr. Edscott Wilson Garcia
Applied Mathematics and Computing
Mexican Petroleum Institute
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