harfbuzz/src/hb-atomic-private.hh

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/*
* Copyright © 2007 Chris Wilson
* Copyright © 2009,2010 Red Hat, Inc.
* Copyright © 2011,2012 Google, Inc.
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*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Contributor(s):
* Chris Wilson <chris@chris-wilson.co.uk>
* Red Hat Author(s): Behdad Esfahbod
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_ATOMIC_PRIVATE_HH
#define HB_ATOMIC_PRIVATE_HH
#include "hb-private.hh"
/* atomic_int */
/* We need external help for these */
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#if 0
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#elif !defined(HB_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
/* mingw32 does not have MemoryBarrier.
* MemoryBarrier may be defined as a macro or a function.
* Just make a failsafe version for ourselves. */
#ifdef MemoryBarrier
#define HBMemoryBarrier MemoryBarrier
#else
static inline void HBMemoryBarrier (void) {
long dummy = 0;
InterlockedExchange (&dummy, 1);
}
#endif
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typedef long hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
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#define hb_atomic_ptr_get(P) (HBMemoryBarrier (), (void *) *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
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#elif !defined(HB_NO_MT) && defined(__APPLE__)
#include <libkern/OSAtomic.h>
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typedef int32_t hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
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#define hb_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
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#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
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typedef int hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V))
#define hb_atomic_ptr_get(P) (void *) (__sync_synchronize (), *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
#elif !defined(HB_NO_MT)
#define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
typedef volatile int hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
#define hb_atomic_ptr_get(P) ((void *) *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
#else /* HB_NO_MT */
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typedef int hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
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#define hb_atomic_ptr_get(P) ((void *) *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
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#endif
/* TODO Add tracing. */
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#endif /* HB_ATOMIC_PRIVATE_HH */