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 (at) 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 /* MinGW has a convoluted history of supporting MemoryBarrier 51 * properly. As such, define a function to wrap the whole 52 * thing. */ 53 static inline void _HBMemoryBarrier (void) { 54 #if !defined(MemoryBarrier) 55 long dummy = 0; 56 InterlockedExchange (&dummy, 1); 57 #else 58 MemoryBarrier (); 59 #endif 60 } 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 #ifdef __MAC_OS_X_MIN_REQUIRED 73 #include <AvailabilityMacros.h> 74 #elif defined(__IPHONE_OS_MIN_REQUIRED) 75 #include <Availability.h> 76 #endif 77 78 typedef int32_t hb_atomic_int_t; 79 #define hb_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V)) 80 81 #define hb_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P)) 82 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100) 83 #define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P)) 84 #else 85 #if __ppc64__ || __x86_64__ || __arm64__ 86 #define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P)) 87 #else 88 #define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P)) 89 #endif 90 #endif 91 92 93 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES) 94 95 typedef int hb_atomic_int_t; 96 #define hb_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V)) 97 98 #define hb_atomic_ptr_get(P) (void *) (__sync_synchronize (), *(P)) 99 #define hb_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N)) 100 101 102 #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS) 103 104 #include <atomic.h> 105 #include <mbarrier.h> 106 107 typedef unsigned int hb_atomic_int_t; 108 #define hb_atomic_int_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V)) 109 110 #define hb_atomic_ptr_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P)) 111 #define hb_atomic_ptr_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false) 112 113 114 #elif !defined(HB_NO_MT) 115 116 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */ 117 typedef volatile int hb_atomic_int_t; 118 #define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V)) 119 120 #define hb_atomic_ptr_get(P) ((void *) *(P)) 121 #define hb_atomic_ptr_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false) 122 123 124 #else /* HB_NO_MT */ 125 126 typedef int hb_atomic_int_t; 127 #define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V)) 128 129 #define hb_atomic_ptr_get(P) ((void *) *(P)) 130 #define hb_atomic_ptr_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false) 131 132 #endif 133 134 /* TODO Add tracing. */ 135 136 #endif /* HB_ATOMIC_PRIVATE_HH */ 137
