third_party/harfbuzz-ng/src/hb-atomic-private.hh

   1 /*
   2  * Copyright © 2007  Chris Wilson
   3  * Copyright © 2009,2010  Red Hat, Inc.
   4  * Copyright © 2011,2012  Google, Inc.
   5  *
   6  *  This is part of HarfBuzz, a text shaping library.
   7  *
   8  * Permission is hereby granted, without written agreement and without
   9  * license or royalty fees, to use, copy, modify, and distribute this
  10  * software and its documentation for any purpose, provided that the
  11  * above copyright notice and the following two paragraphs appear in
  12  * all copies of this software.
  13  *
  14  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  15  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  16  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  17  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  18  * DAMAGE.
  19  *
  20  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  21  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  22  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  23  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  24  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  25  *
  26  * Contributor(s):
  27  *      Chris Wilson <chris@chris-wilson.co.uk>
  28  * Red Hat Author(s): Behdad Esfahbod
  29  * Google Author(s): Behdad Esfahbod
  30  */
  31
  32 #ifndef HB_ATOMIC_PRIVATE_HH
  33 #define HB_ATOMIC_PRIVATE_HH
  34
  35 #include "hb-private.hh"
  36
  37
  38 /* atomic_int */
  39
  40 /* We need external help for these */
  41
  42 #if 0
  43
  44
  45 #elif !defined(HB_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__)
  46
  47 #define WIN32_LEAN_AND_MEAN
  48 #include <windows.h>
  49
  50 /* mingw32 does not have MemoryBarrier.
  51  * MemoryBarrier may be defined as a macro or a function.
  52  * Just make a failsafe version for ourselves. */
  53 #ifdef MemoryBarrier
  54 #define HBMemoryBarrier MemoryBarrier
  55 #else
  56 static inline void HBMemoryBarrier (void) {
  57   long dummy = 0;
  58   InterlockedExchange (&dummy, 1);
  59 }
  60 #endif
  61
  62 typedef long hb_atomic_int_t;
  63 #define hb_atomic_int_add(AI, V)        InterlockedExchangeAdd (&(AI), (V))
  64
  65 #define hb_atomic_ptr_get(P)            (HBMemoryBarrier (), (void *) *(P))
  66 #define hb_atomic_ptr_cmpexch(P,O,N)    (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
  67
  68
  69 #elif !defined(HB_NO_MT) && defined(__APPLE__)
  70
  71 #include <libkern/OSAtomic.h>
  72
  73 typedef int32_t hb_atomic_int_t;
  74 #define hb_atomic_int_add(AI, V)        (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
  75
  76 #define hb_atomic_ptr_get(P)            (OSMemoryBarrier (), (void *) *(P))
  77 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
  78
  79
  80 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
  81
  82 typedef int hb_atomic_int_t;
  83 #define hb_atomic_int_add(AI, V)        __sync_fetch_and_add (&(AI), (V))
  84
  85 #define hb_atomic_ptr_get(P)            (void *) (__sync_synchronize (), *(P))
  86 #define hb_atomic_ptr_cmpexch(P,O,N)    __sync_bool_compare_and_swap ((P), (O), (N))
  87
  88
  89 #elif !defined(HB_NO_MT)
  90
  91 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
  92 typedef volatile int hb_atomic_int_t;
  93 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
  94
  95 #define hb_atomic_ptr_get(P)            ((void *) *(P))
  96 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
  97
  98
  99 #else /* HB_NO_MT */
 100
 101 typedef int hb_atomic_int_t;
 102 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
 103
 104 #define hb_atomic_ptr_get(P)            ((void *) *(P))
 105 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
 106
 107 #endif
 108
 109 /* TODO Add tracing. */
 110
 111 #endif /* HB_ATOMIC_PRIVATE_HH */