119 lines
4.0 KiB
C
119 lines
4.0 KiB
C
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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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* Pthreads4w - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999-2018, Pthreads4w contributors
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*
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* Homepage: https://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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* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
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*
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* This file is part of Pthreads4w.
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*
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* Pthreads4w is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Pthreads4w 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
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*/
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#if !defined( SEMAPHORE_H )
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#define SEMAPHORE_H
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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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/* Internal macros, common to the public interfaces for various
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* Pthreads4w 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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/* 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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* then include <time.h> selectively, to acquire a complete
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* definition, (if available).
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*/
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struct timespec;
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#define __need_struct_timespec
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#include <time.h>
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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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/* 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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__PTW32_BEGIN_C_DECLS
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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_DLLPORT int PTW32_CDECL sem_init (sem_t * sem,
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int pshared,
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unsigned int value);
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PTW32_DLLPORT int PTW32_CDECL sem_destroy (sem_t * sem);
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PTW32_DLLPORT int PTW32_CDECL sem_trywait (sem_t * sem);
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PTW32_DLLPORT int PTW32_CDECL sem_wait (sem_t * sem);
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PTW32_DLLPORT int PTW32_CDECL sem_timedwait (sem_t * sem,
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const struct timespec * abstime);
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PTW32_DLLPORT int PTW32_CDECL sem_post (sem_t * sem);
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PTW32_DLLPORT int PTW32_CDECL sem_post_multiple (sem_t * sem,
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int count);
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PTW32_DLLPORT sem_t * PTW32_CDECL sem_open (const char *, int, ...);
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PTW32_DLLPORT int PTW32_CDECL sem_close (sem_t * sem);
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PTW32_DLLPORT int PTW32_CDECL sem_unlink (const char * name);
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PTW32_DLLPORT int PTW32_CDECL sem_getvalue (sem_t * sem,
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int * sval);
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__PTW32_END_C_DECLS
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#endif /* !SEMAPHORE_H */
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