semaphore.h

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/*
 * Module: semaphore.h
 *
 * Purpose:
 *  Semaphores aren't actually part of the PThreads standard.
 *  They are defined by the POSIX Standard:
 *
 *      POSIX 1003.1b-1993  (POSIX.1b)
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: jschmidlapp@users.sourceforge.net
 *
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: jschmidlapp@users.sourceforge.net
 *
 *
 *      Based upon Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 *
 *      Contact Email: rpj@callisto.canberra.edu.au
 *
 *      The original list of contributors to the Pthreads-win32 project
 *      is contained in the file CONTRIBUTORS.ptw32 included with the
 *      source code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 *
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 *
 *      This library is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *      Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public
 *      License along with this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#if !defined( SEMAPHORE_H )
#define SEMAPHORE_H

#if defined(_POSIX_SOURCE)
#define PTE_LEVEL 0
/* Early POSIX */
#endif

#if defined(INCLUDE_NP)
#undef PTE_LEVEL
#define PTE_LEVEL 2
/* Include Non-Portable extensions */
#endif

/*
 *
 */

#define _POSIX_SEMAPHORES

#ifdef __cplusplus
extern "C"
  {
#endif              /* __cplusplus */


    typedef struct sem_t_ * sem_t;

    int sem_init (sem_t * sem,
                  int pshared,
                  unsigned int value);

    int sem_destroy (sem_t * sem);

    int sem_trywait (sem_t * sem);

    int sem_wait (sem_t * sem);

    int sem_timedwait (sem_t * sem,
                       const struct timespec * abstime);

    int sem_post (sem_t * sem);

    int sem_post_multiple (sem_t * sem,
                           int count);

    int sem_open (const char * name,
                  int oflag,
                  mode_t mode,
                  unsigned int value);

    int sem_close (sem_t * sem);

    int sem_unlink (const char * name);

    int sem_getvalue (sem_t * sem,
                      int * sval);

#ifdef __cplusplus
  }             /* End of extern "C" */
#endif              /* __cplusplus */

#endif              /* !SEMAPHORE_H */