kc3-lang/harfbuzz/src/hb-atomic-private.hh

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• Hash : fa2bd9fb
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  Date : 2012-07-14T12:15:54
  

  Further simplify atomic ops on Visual Studio
  

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• src/hb-atomic-private.hh

• /*
   * Copyright © 2007  Chris Wilson
   * Copyright © 2009,2010  Red Hat, Inc.
   * Copyright © 2011,2012  Google, Inc.
   *
   *  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 */
  
  #if 0
  
  
  #elif !defined(HB_NO_MT) && defined(_MSC_VER) && _MSC_VER >= 1600
  
  #include <intrin.h>
  /* On x86, _InterlockedCompareExchangePointer is a macro defined in concrt.h */
  #include <concrt.h>
  
  typedef long hb_atomic_int_t;
  #define hb_atomic_int_add(AI, V)	_InterlockedExchangeAdd (&(AI), (V))
  
  #define hb_atomic_ptr_get(P)		(MemoryBarrier (), (void *) *(P))
  #define hb_atomic_ptr_cmpexch(P,O,N)	(_InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
  
  
  #elif !defined(HB_NO_MT) && defined(__APPLE__)
  
  #include <libkern/OSAtomic.h>
  
  typedef int32_t hb_atomic_int_t;
  #define hb_atomic_int_add(AI, V)	(OSAtomicAdd32Barrier ((V), &(AI)) - (V))
  
  #define hb_atomic_ptr_get(P)		(OSMemoryBarrier (), (void *) *(P))
  #define hb_atomic_ptr_cmpexch(P,O,N)	OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
  
  
  #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
  
  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) && defined(HAVE_GLIB)
  
  #include <glib.h>
  typedef int hb_atomic_int_t;
  #if GLIB_CHECK_VERSION(2,29,5)
  #define hb_atomic_int_add(AI, V)	g_atomic_int_add (&(AI), (V))
  #else
  #define hb_atomic_int_add(AI, V)	g_atomic_int_exchange_and_add (&(AI), (V))
  #endif
  
  #define hb_atomic_ptr_get(P)		g_atomic_pointer_get (P)
  #define hb_atomic_ptr_cmpexch(P,O,N)	g_atomic_pointer_compare_and_exchange ((void **) (P), (void *) (O), (void *) (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))
  #define hb_atomic_ptr_cmpexch(P,O,N)	(* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
  
  
  #else /* HB_NO_MT */
  
  typedef int hb_atomic_int_t;
  #define hb_atomic_int_add(AI, V)	(((AI) += (V)) - (V))
  
  #define hb_atomic_ptr_get(P)		((void *) *(P))
  #define hb_atomic_ptr_cmpexch(P,O,N)	(* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
  
  #endif
  
  /* TODO Add tracing. */
  
  #endif /* HB_ATOMIC_PRIVATE_HH */
  

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