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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)
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* 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:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#if !defined( SEMAPHORE_H )
#define SEMAPHORE_H
/* FIXME: POSIX.1 says that _POSIX_SEMAPHORES should be defined
* in <unistd.h>, not here; for later POSIX.1 versions, its value
* should match the corresponding _POSIX_VERSION number, but in
* the case of POSIX.1b-1993, the value is unspecified.
*
* Notwithstanding the above, since POSIX semaphores, (and indeed
* having any <unistd.h> to #include), are not a standard feature
* on MS-Windows, it is convenient to retain this definition here;
* we may consider adding a hook, to make it selectively available
* for inclusion by <unistd.h>, in those cases (e.g. MinGW) where
* <unistd.h> is provided.
*/
#define _POSIX_SEMAPHORES
/* Internal macros, common to the public interfaces for various
* Pthreads4w components, are defined in <_ptw32.h>; we must
* include them here.
*/
#include <_ptw32.h>
/* The sem_timedwait() function was added in POSIX.1-2001; it
* requires struct timespec to be defined, at least as a partial
* (a.k.a. incomplete) data type. Forward declare it as such,
* then include <time.h> selectively, to acquire a complete
* definition, (if available).
*/
struct timespec;
#define __need_struct_timespec
#include <time.h>
/* The data type used to represent our semaphore implementation,
* as required by POSIX.1; FIXME: consider renaming the underlying
* structure tag, to avoid possible pollution of user namespace.
*/
typedef struct sem_t_ * sem_t;
/* POSIX.1b (and later) mandates SEM_FAILED as the value to be
* returned on failure of sem_open(); (our implementation is a
* stub, which will always return this).
*/
#define SEM_FAILED (sem_t *)(-1)
__PTW32_BEGIN_C_DECLS
/* Function prototypes: some are implemented as stubs, which
* always fail; (FIXME: identify them).
*/
PTW32_DLLPORT int PTW32_CDECL sem_init (sem_t * sem,
int pshared,
unsigned int value);
PTW32_DLLPORT int PTW32_CDECL sem_destroy (sem_t * sem);
PTW32_DLLPORT int PTW32_CDECL sem_trywait (sem_t * sem);
PTW32_DLLPORT int PTW32_CDECL sem_wait (sem_t * sem);
PTW32_DLLPORT int PTW32_CDECL sem_timedwait (sem_t * sem,
const struct timespec * abstime);
PTW32_DLLPORT int PTW32_CDECL sem_post (sem_t * sem);
PTW32_DLLPORT int PTW32_CDECL sem_post_multiple (sem_t * sem,
int count);
PTW32_DLLPORT sem_t * PTW32_CDECL sem_open (const char *, int, ...);
PTW32_DLLPORT int PTW32_CDECL sem_close (sem_t * sem);
PTW32_DLLPORT int PTW32_CDECL sem_unlink (const char * name);
PTW32_DLLPORT int PTW32_CDECL sem_getvalue (sem_t * sem,
int * sval);
__PTW32_END_C_DECLS
#endif /* !SEMAPHORE_H */
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