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 #include <windows.h>
  48
  49 /* MinGW has a convoluted history of supporting MemoryBarrier
  50  * properly.  As such, define a function to wrap the whole
  51  * thing. */
  52 static inline void _HBMemoryBarrier (void) {
  53 #if !defined(MemoryBarrier)
  54   long dummy = 0;
  55   InterlockedExchange (&dummy, 1);
  56 #else
  57   MemoryBarrier ();
  58 #endif
  59 }
  60
  61 typedef LONG hb_atomic_int_t;
  62 #define hb_atomic_int_add(AI, V)        InterlockedExchangeAdd (&(AI), (V))
  63
  64 #define hb_atomic_ptr_get(P)            (_HBMemoryBarrier (), (void *) *(P))
  65 #define hb_atomic_ptr_cmpexch(P,O,N)    (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
  66
  67
  68 #elif !defined(HB_NO_MT) && defined(__APPLE__)
  69
  70 #include <libkern/OSAtomic.h>
  71 #ifdef __MAC_OS_X_MIN_REQUIRED
  72 #include <AvailabilityMacros.h>
  73 #elif defined(__IPHONE_OS_MIN_REQUIRED)
  74 #include <Availability.h>
  75 #endif
  76
  77 typedef int32_t hb_atomic_int_t;
  78 #define hb_atomic_int_add(AI, V)        (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
  79
  80 #define hb_atomic_ptr_get(P)            (OSMemoryBarrier (), (void *) *(P))
  81 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
  82 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
  83 #else
  84 #if __ppc64__ || __x86_64__ || __aarch64__
  85 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
  86 #else
  87 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
  88 #endif
  89 #endif
  90
  91
  92 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
  93
  94 typedef int hb_atomic_int_t;
  95 #define hb_atomic_int_add(AI, V)        __sync_fetch_and_add (&(AI), (V))
  96
  97 #define hb_atomic_ptr_get(P)            (void *) (__sync_synchronize (), *(P))
  98 #define hb_atomic_ptr_cmpexch(P,O,N)    __sync_bool_compare_and_swap ((P), (O), (N))
  99
 100
 101 #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
 102
 103 #include <atomic.h>
 104 #include <mbarrier.h>
 105
 106 typedef unsigned int hb_atomic_int_t;
 107 #define hb_atomic_int_add(AI, V)        ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
 108
 109 #define hb_atomic_ptr_get(P)            ( ({__machine_rw_barrier ();}), (void *) *(P))
 110 #define hb_atomic_ptr_cmpexch(P,O,N)    ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
 111
 112
 113 #elif !defined(HB_NO_MT)
 114
 115 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
 116 typedef volatile int hb_atomic_int_t;
 117 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
 118
 119 #define hb_atomic_ptr_get(P)            ((void *) *(P))
 120 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
 121
 122
 123 #else /* HB_NO_MT */
 124
 125 typedef int hb_atomic_int_t;
 126 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
 127
 128 #define hb_atomic_ptr_get(P)            ((void *) *(P))
 129 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
 130
 131 #endif
 132
 133 /* TODO Add tracing. */
 134
 135 #endif /* HB_ATOMIC_PRIVATE_HH */