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 #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 */ 136
