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/* |
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* Module: semaphore.h |
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* |
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* Purpose: |
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* Semaphores aren't actually part of the PThreads standard. |
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* They are defined by the POSIX Standard: |
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* |
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* POSIX 1003.1b-1993 (POSIX.1b) |
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* |
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* -------------------------------------------------------------------------- |
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* |
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* Pthreads-win32 - POSIX Threads Library for Win32 |
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* Copyright(C) 1998 John E. Bossom |
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* Copyright(C) 1999-2012, 2016, Pthreads-win32 contributors |
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* |
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* Homepage1: http://sourceware.org/pthreads-win32/ |
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* Homepage2: http://sourceforge.net/projects/pthreads4w/ |
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* |
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* The current list of contributors is contained |
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* in the file CONTRIBUTORS included with the source |
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* code distribution. The list can also be seen at the |
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* following World Wide Web location: |
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* http://sources.redhat.com/pthreads-win32/contributors.html |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library in the file COPYING.LIB; |
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* if not, write to the Free Software Foundation, Inc., |
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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*/ |
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#ifndef _SEMAPHORE_H |
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#define _SEMAPHORE_H |
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|
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/* FIXME: POSIX.1 says that _POSIX_SEMAPHORES should be defined |
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* in <unistd.h>, not here; for later POSIX.1 versions, its value |
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* should match the corresponding _POSIX_VERSION number, but in |
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* the case of POSIX.1b-1993, the value is unspecified. |
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* |
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* Notwithstanding the above, since POSIX semaphores, (and indeed |
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* having any <unistd.h> to #include), are not a standard feature |
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* on MS-Windows, it is convenient to retain this definition here; |
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* we may consider adding a hook, to make it selectively available |
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* for inclusion by <unistd.h>, in those cases (e.g. MinGW) where |
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* <unistd.h> is provided. |
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*/ |
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#define _POSIX_SEMAPHORES |
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|
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/* Internal macros, common to the public interfaces for various |
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* pthreads-win32 components, are defined in <_ptw32.h>; we must |
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* include them here. |
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*/ |
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#include <_ptw32.h> |
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|
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/* The sem_timedwait() function was added in POSIX.1-2001; it |
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* requires struct timespec to be defined, at least as a partial |
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* (a.k.a. incomplete) data type. Forward declare it as such. |
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*/ |
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struct timespec; |
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|
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/* The data type used to represent our semaphore implementation, |
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* as required by POSIX.1; FIXME: consider renaming the underlying |
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* structure tag, to avoid possible pollution of user namespace. |
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*/ |
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typedef struct sem_t_ * sem_t; |
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|
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/* POSIX.1b (and later) mandates SEM_FAILED as the value to be |
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* returned on failure of sem_open(); (our implementation is a |
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* stub, which will always return this). |
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*/ |
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#define SEM_FAILED (sem_t *)(-1) |
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|
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__PTW32_BEGIN_C_DECLS |
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|
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/* Function prototypes: some are implemented as stubs, which |
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* always fail; (FIXME: identify them). |
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*/ |
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__PTW32_DECLSPEC int sem_init (sem_t * sem, int pshared, unsigned int value); |
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__PTW32_DECLSPEC int sem_destroy (sem_t * sem); |
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__PTW32_DECLSPEC int sem_trywait (sem_t * sem); |
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__PTW32_DECLSPEC int sem_wait (sem_t * sem); |
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__PTW32_DECLSPEC int sem_timedwait (sem_t * sem, const struct timespec * abstime); |
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__PTW32_DECLSPEC int sem_post (sem_t * sem); |
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__PTW32_DECLSPEC int sem_post_multiple (sem_t * sem, int count); |
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__PTW32_DECLSPEC sem_t *sem_open (const char *, int, ...); |
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__PTW32_DECLSPEC int sem_close (sem_t * sem); |
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__PTW32_DECLSPEC int sem_unlink (const char * name); |
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__PTW32_DECLSPEC int sem_getvalue (sem_t * sem, int * sval); |
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|
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__PTW32_END_C_DECLS |
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|
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#endif /* !_SEMAPHORE_H */ |
