127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
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/*
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* Atomic int and pointer operations. Originally copied from HarfBuzz.
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*
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* Copyright © 2007 Chris Wilson
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2011,2012 Google, Inc.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Contributor(s):
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* Chris Wilson <chris@chris-wilson.co.uk>
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef _FCMUTEX_H_
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#define _FCMUTEX_H_
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/* mutex */
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/* We need external help for these */
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#if 0
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#elif !defined(FC_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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typedef CRITICAL_SECTION fc_mutex_impl_t;
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#define FC_MUTEX_IMPL_INIT { NULL, 0, 0, NULL, NULL, 0 }
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#define fc_mutex_impl_init(M) InitializeCriticalSection (M)
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#define fc_mutex_impl_lock(M) EnterCriticalSection (M)
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#define fc_mutex_impl_unlock(M) LeaveCriticalSection (M)
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#define fc_mutex_impl_finish(M) DeleteCriticalSection (M)
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#elif !defined(FC_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
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#include <pthread.h>
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typedef pthread_mutex_t fc_mutex_impl_t;
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#define FC_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER
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#define fc_mutex_impl_init(M) pthread_mutex_init (M, NULL)
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#define fc_mutex_impl_lock(M) pthread_mutex_lock (M)
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#define fc_mutex_impl_unlock(M) pthread_mutex_unlock (M)
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#define fc_mutex_impl_finish(M) pthread_mutex_destroy (M)
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#elif !defined(FC_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
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#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
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# include <sched.h>
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# define FC_SCHED_YIELD() sched_yield ()
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#else
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# define FC_SCHED_YIELD() FC_STMT_START {} FC_STMT_END
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#endif
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/* This actually is not a totally awful implementation. */
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typedef volatile int fc_mutex_impl_t;
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#define FC_MUTEX_IMPL_INIT 0
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#define fc_mutex_impl_init(M) *(M) = 0
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#define fc_mutex_impl_lock(M) FC_STMT_START { while (__sync_lock_test_and_set((M), 1)) FC_SCHED_YIELD (); } FC_STMT_END
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#define fc_mutex_impl_unlock(M) __sync_lock_release (M)
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#define fc_mutex_impl_finish(M) FC_STMT_START {} FC_STMT_END
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#elif !defined(FC_NO_MT)
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#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
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# include <sched.h>
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# define FC_SCHED_YIELD() sched_yield ()
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#else
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# define FC_SCHED_YIELD() FC_STMT_START {} FC_STMT_END
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#endif
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#define FC_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */
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typedef volatile int fc_mutex_impl_t;
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#define FC_MUTEX_IMPL_INIT 0
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#define fc_mutex_impl_init(M) *(M) = 0
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#define fc_mutex_impl_lock(M) FC_STMT_START { while (*(M)) FC_SCHED_YIELD (); (*(M))++; } FC_STMT_END
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#define fc_mutex_impl_unlock(M) (*(M))--;
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#define fc_mutex_impl_finish(M) FC_STMT_START {} FC_STMT_END
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#else /* FC_NO_MT */
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typedef int fc_mutex_impl_t;
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#define FC_MUTEX_IMPL_INIT 0
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#define fc_mutex_impl_init(M) FC_STMT_START {} FC_STMT_END
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#define fc_mutex_impl_lock(M) FC_STMT_START {} FC_STMT_END
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#define fc_mutex_impl_unlock(M) FC_STMT_START {} FC_STMT_END
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#define fc_mutex_impl_finish(M) FC_STMT_START {} FC_STMT_END
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#endif
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#define FC_MUTEX_INIT {FC_MUTEX_IMPL_INIT}
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typedef fc_mutex_impl_t FcMutex;
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static inline void FcMutexInit (FcMutex *m) { fc_mutex_impl_init (m); }
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static inline void FcMutexLock (FcMutex *m) { fc_mutex_impl_lock (m); }
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static inline void FcMutexUnlock (FcMutex *m) { fc_mutex_impl_unlock (m); }
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static inline void FcMutexFinish (FcMutex *m) { fc_mutex_impl_finish (m); }
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#endif /* _FCMUTEX_H_ */
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