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semaphore.h

/*
 * 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-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2003 Pthreads-win32 contributors
 * 
 *      Contact Email: rpj@callisto.canberra.edu.au
 * 
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS 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

#undef PTW32_LEVEL

#if defined(_POSIX_SOURCE)
#define PTW32_LEVEL 0
/* Early POSIX */
#endif

#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309
#undef PTW32_LEVEL
#define PTW32_LEVEL 1
/* Include 1b, 1c and 1d */
#endif

#if defined(INCLUDE_NP)
#undef PTW32_LEVEL
#define PTW32_LEVEL 2
/* Include Non-Portable extensions */
#endif

#define PTW32_LEVEL_MAX 3

#if !defined(PTW32_LEVEL)
#define PTW32_LEVEL PTW32_LEVEL_MAX
/* Include everything */
#endif

#if __GNUC__ && ! defined (__declspec)
# error Please upgrade your GNU compiler to one that supports __declspec.
#endif

/*
 * When building the DLL code, you should define PTW32_BUILD so that
 * the variables/functions are exported correctly. When using the DLL,
 * do NOT define PTW32_BUILD, and then the variables/functions will
 * be imported correctly.
 */
#ifdef PTW32_BUILD
# define PTW32_DLLPORT __declspec (dllexport)
#else
# define PTW32_DLLPORT __declspec (dllimport)
#endif


/*
 * This is a duplicate of what is in the autoconf config.h,
 * which is only used when building the pthread-win32 libraries.
 */

#ifndef PTW32_CONFIG_H
#  if defined(WINCE)
#    define NEED_ERRNO
#    define NEED_SEM
#  endif
#  if defined(_UWIN) || defined(__MINGW32__)
#    define HAVE_MODE_T
#  endif
#endif

/*
 *
 */

#if PTW32_LEVEL >= PTW32_LEVEL_MAX
#ifdef NEED_ERRNO
#include "need_errno.h"
#else
#include <errno.h>
#endif
#endif /* PTW32_LEVEL >= PTW32_LEVEL_MAX */

#define _POSIX_SEMAPHORES

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

#ifndef HAVE_MODE_T
typedef unsigned int mode_t;
#endif


typedef struct sem_t_ * sem_t;

PTW32_DLLPORT int sem_init (sem_t * sem,
                      int pshared,
                      unsigned int value);

PTW32_DLLPORT int sem_destroy (sem_t * sem);

PTW32_DLLPORT int sem_trywait (sem_t * sem);

PTW32_DLLPORT int sem_wait (sem_t * sem);

PTW32_DLLPORT int sem_timedwait (sem_t * sem,
                         const struct timespec * abstime);

PTW32_DLLPORT int sem_post (sem_t * sem);

PTW32_DLLPORT int sem_post_multiple (sem_t * sem,
                             int count);

PTW32_DLLPORT int sem_open (const char * name,
                      int oflag,
                      mode_t mode,
                      unsigned int value);

PTW32_DLLPORT int sem_close (sem_t * sem);

PTW32_DLLPORT int sem_unlink (const char * name);

PTW32_DLLPORT int sem_getvalue (sem_t * sem,
                        int * sval);

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

#undef PTW32_LEVEL
#undef PTW32_LEVEL_MAX

#endif                        /* !SEMAPHORE_H */

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