| 1 | /*
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| 2 | * Module: semaphore.h
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| 3 | *
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| 4 | * Purpose:
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| 5 | * Semaphores aren't actually part of the PThreads standard.
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| 6 | * They are defined by the POSIX Standard:
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| 7 | *
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| 8 | * POSIX 1003.1b-1993 (POSIX.1b)
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| 9 | *
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| 10 | * --------------------------------------------------------------------------
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| 11 | *
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| 12 | * Pthreads-win32 - POSIX Threads Library for Win32
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| 13 | * Copyright(C) 1998 John E. Bossom
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| 14 | * Copyright(C) 1999-2012, 2016, Pthreads-win32 contributors
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| 15 | *
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| 16 | * Homepage1: http://sourceware.org/pthreads-win32/
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| 17 | * Homepage2: http://sourceforge.net/projects/pthreads4w/
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| 18 | *
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| 19 | * The current list of contributors is contained
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| 20 | * in the file CONTRIBUTORS included with the source
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| 21 | * code distribution. The list can also be seen at the
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| 22 | * following World Wide Web location:
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| 23 | * http://sources.redhat.com/pthreads-win32/contributors.html
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| 24 | *
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| 25 | * This library is free software; you can redistribute it and/or
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| 26 | * modify it under the terms of the GNU Lesser General Public
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| 27 | * License as published by the Free Software Foundation; either
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| 28 | * version 2 of the License, or (at your option) any later version.
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| 29 | *
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| 30 | * This library is distributed in the hope that it will be useful,
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| 31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 33 | * Lesser General Public License for more details.
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| 34 | *
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| 35 | * You should have received a copy of the GNU Lesser General Public
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| 36 | * License along with this library in the file COPYING.LIB;
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| 37 | * if not, write to the Free Software Foundation, Inc.,
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| 38 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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| 39 | */
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| 40 | #ifndef _SEMAPHORE_H
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| 41 | #define _SEMAPHORE_H
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| 42 |
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| 43 | /* FIXME: POSIX.1 says that _POSIX_SEMAPHORES should be defined
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| 44 | * in <unistd.h>, not here; for later POSIX.1 versions, its value
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| 45 | * should match the corresponding _POSIX_VERSION number, but in
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| 46 | * the case of POSIX.1b-1993, the value is unspecified.
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| 47 | *
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| 48 | * Notwithstanding the above, since POSIX semaphores, (and indeed
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| 49 | * having any <unistd.h> to #include), are not a standard feature
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| 50 | * on MS-Windows, it is convenient to retain this definition here;
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| 51 | * we may consider adding a hook, to make it selectively available
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| 52 | * for inclusion by <unistd.h>, in those cases (e.g. MinGW) where
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| 53 | * <unistd.h> is provided.
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| 54 | */
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| 55 | #define _POSIX_SEMAPHORES
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| 56 |
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| 57 | /* Internal macros, common to the public interfaces for various
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| 58 | * pthreads-win32 components, are defined in <_ptw32.h>; we must
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| 59 | * include them here.
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| 60 | */
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| 61 | #include <_ptw32.h>
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| 62 |
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| 63 | /* The sem_timedwait() function was added in POSIX.1-2001; it
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| 64 | * requires struct timespec to be defined, at least as a partial
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| 65 | * (a.k.a. incomplete) data type. Forward declare it as such.
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| 66 | */
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| 67 | struct timespec;
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| 68 |
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| 69 | /* The data type used to represent our semaphore implementation,
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| 70 | * as required by POSIX.1; FIXME: consider renaming the underlying
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| 71 | * structure tag, to avoid possible pollution of user namespace.
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| 72 | */
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| 73 | typedef struct sem_t_ * sem_t;
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| 74 |
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| 75 | /* POSIX.1b (and later) mandates SEM_FAILED as the value to be
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| 76 | * returned on failure of sem_open(); (our implementation is a
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| 77 | * stub, which will always return this).
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| 78 | */
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| 79 | #define SEM_FAILED (sem_t *)(-1)
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| 80 |
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| 81 | __PTW32_BEGIN_C_DECLS
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| 82 |
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| 83 | /* Function prototypes: some are implemented as stubs, which
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| 84 | * always fail; (FIXME: identify them).
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| 85 | */
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| 86 | __PTW32_DECLSPEC int sem_init (sem_t * sem, int pshared, unsigned int value);
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| 87 | __PTW32_DECLSPEC int sem_destroy (sem_t * sem);
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| 88 | __PTW32_DECLSPEC int sem_trywait (sem_t * sem);
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| 89 | __PTW32_DECLSPEC int sem_wait (sem_t * sem);
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| 90 | __PTW32_DECLSPEC int sem_timedwait (sem_t * sem, const struct timespec * abstime);
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| 91 | __PTW32_DECLSPEC int sem_post (sem_t * sem);
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| 92 | __PTW32_DECLSPEC int sem_post_multiple (sem_t * sem, int count);
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| 93 | __PTW32_DECLSPEC sem_t *sem_open (const char *, int, ...);
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| 94 | __PTW32_DECLSPEC int sem_close (sem_t * sem);
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| 95 | __PTW32_DECLSPEC int sem_unlink (const char * name);
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| 96 | __PTW32_DECLSPEC int sem_getvalue (sem_t * sem, int * sval);
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| 97 |
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| 98 | __PTW32_END_C_DECLS
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| 99 |
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| 100 | #endif /* !_SEMAPHORE_H */
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