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(_WIN32) || defined(__CYGWIN__))
  46
  47 #define WIN32_LEAN_AND_MEAN
  48 #include <windows.h>
  49
  50 #if defined(__MINGW32__) && !defined(MemoryBarrier)
  51 static inline void _HBMemoryBarrier (void) {
  52   long dummy = 0;
  53   InterlockedExchange (&dummy, 1);
  54 }
  55 # define MemoryBarrier _HBMemoryBarrier
  56 #endif
  57
  58 typedef LONG hb_atomic_int_t;
  59 #define hb_atomic_int_add(AI, V)        InterlockedExchangeAdd (&(AI), (V))
  60
  61 #define hb_atomic_ptr_get(P)            (MemoryBarrier (), (void *) *(P))
  62 #define hb_atomic_ptr_cmpexch(P,O,N)    (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
  63
  64
  65 #elif !defined(HB_NO_MT) && defined(__APPLE__)
  66
  67 #include <libkern/OSAtomic.h>
  68 #ifdef __MAC_OS_X_MIN_REQUIRED
  69 #include <AvailabilityMacros.h>
  70 #elif defined(__IPHONE_OS_MIN_REQUIRED)
  71 #include <Availability.h>
  72 #endif
  73
  74 typedef int32_t hb_atomic_int_t;
  75 #define hb_atomic_int_add(AI, V)        (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
  76
  77 #define hb_atomic_ptr_get(P)            (OSMemoryBarrier (), (void *) *(P))
  78 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
  79 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
  80 #else
  81 #if __ppc64__ || __x86_64__
  82 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
  83 #else
  84 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
  85 #endif
  86 #endif
  87
  88
  89 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
  90
  91 typedef int hb_atomic_int_t;
  92 #define hb_atomic_int_add(AI, V)        __sync_fetch_and_add (&(AI), (V))
  93
  94 #define hb_atomic_ptr_get(P)            (void *) (__sync_synchronize (), *(P))
  95 #define hb_atomic_ptr_cmpexch(P,O,N)    __sync_bool_compare_and_swap ((P), (O), (N))
  96
  97
  98 #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
  99
 100 #include <atomic.h>
 101 #include <mbarrier.h>
 102
 103 typedef unsigned int hb_atomic_int_t;
 104 #define hb_atomic_int_add(AI, V)        ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
 105
 106 #define hb_atomic_ptr_get(P)            ( ({__machine_rw_barrier ();}), (void *) *(P))
 107 #define hb_atomic_ptr_cmpexch(P,O,N)    ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
 108
 109
 110 #elif !defined(HB_NO_MT)
 111
 112 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
 113 typedef volatile int hb_atomic_int_t;
 114 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
 115
 116 #define hb_atomic_ptr_get(P)            ((void *) *(P))
 117 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
 118
 119
 120 #else /* HB_NO_MT */
 121
 122 typedef int hb_atomic_int_t;
 123 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
 124
 125 #define hb_atomic_ptr_get(P)            ((void *) *(P))
 126 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
 127
 128 #endif
 129
 130 /* TODO Add tracing. */
 131
 132 #endif /* HB_ATOMIC_PRIVATE_HH */