1 /* 2 * Mutex operations. Originally copied from HarfBuzz. 3 * 4 * Copyright 2007 Chris Wilson 5 * Copyright 2009,2010 Red Hat, Inc. 6 * Copyright 2011,2012,2013 Google, Inc. 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 _FCATOMIC_H_ 33 #define _FCATOMIC_H_ 34 35 #ifdef HAVE_CONFIG_H 36 #include <config.h> 37 #endif 38 39 40 /* atomic_int */ 41 42 /* We need external help for these */ 43 44 #if 0 45 46 typedef <type> fc_atomic_int_t; 47 #define FC_ATOMIC_INT_FORMAT "<printf format for fc_atomic_int_t>" 48 #define fc_atomic_int_add(AI, V) o = (AI), (AI) += (V), o // atomic acquire/release 49 50 #define fc_atomic_ptr_get(P) *(P) // atomic acquire 51 #define fc_atomic_ptr_cmpexch(P,O,N) *(P) == (O) ? (*(P) = (N), FcTrue) : FcFalse // atomic release 52 53 54 #elif !defined(FC_NO_MT) && defined(HAVE_STDATOMIC_PRIMITIVES) 55 56 #include <stdatomic.h> 57 58 typedef atomic_int fc_atomic_int_t; 59 #define FC_ATOMIC_INT_FORMAT "d" 60 #define fc_atomic_int_add(AI, V) atomic_fetch_add_explicit (&(AI), (V), memory_order_acq_rel) 61 62 #define fc_atomic_ptr_get(P) atomic_load_explicit ((_Atomic(void *)*) (P), memory_order_acquire) 63 static inline FcBool _fc_atomic_ptr_cmpexch(_Atomic(void *)*P, void * O, _Atomic(void *) N) { 64 return atomic_compare_exchange_strong_explicit(P, &O, N, memory_order_release, memory_order_relaxed); 65 } 66 #define fc_atomic_ptr_cmpexch(P,O,N) _fc_atomic_ptr_cmpexch ((_Atomic(void *)*) (P), (O), (N)) 67 68 /* Casting -1 to _Atomic(int) produces a compiler error with Clang (but not GCC) 69 * so we have to override FC_REF_CONSTANT_VALUE for stdatomic.h atomics. 70 * See https://bugs.llvm.org/show_bug.cgi?id=40249. */ 71 #define FC_REF_CONSTANT_VALUE (-1) 72 73 #elif !defined(FC_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__) 74 75 #include "fcwindows.h" 76 77 typedef LONG fc_atomic_int_t; 78 #define FC_ATOMIC_INT_FORMAT "ld" 79 #define fc_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V)) 80 81 #define fc_atomic_ptr_get(P) (InterlockedCompareExchangePointerAcquire ((void **) (P), NULL, NULL)) 82 #define fc_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O)) 83 84 85 #elif !defined(FC_NO_MT) && defined(__APPLE__) 86 87 #include <libkern/OSAtomic.h> 88 #include <AvailabilityMacros.h> 89 90 typedef int fc_atomic_int_t; 91 #define FC_ATOMIC_INT_FORMAT "d" 92 #define fc_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V)) 93 94 #if SIZEOF_VOID_P == 8 95 #define fc_atomic_ptr_get(P) OSAtomicAdd64Barrier (0, (int64_t*)(P)) 96 #elif SIZEOF_VOID_P == 4 97 #define fc_atomic_ptr_get(P) OSAtomicAdd32Barrier (0, (int32_t*)(P)) 98 #else 99 #error "SIZEOF_VOID_P not 4 or 8 (assumes CHAR_BIT is 8)" 100 #endif 101 102 #if (MAC_OS_X_VERSION_MIN_REQUIRED >= 1050 || __IPHONE_OS_VERSION_MIN_REQUIRED >= 20100) 103 #define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P)) 104 #else 105 #if __LP64__ 106 #define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t *) (P)) 107 #else 108 #define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t *) (P)) 109 #endif 110 #endif 111 112 113 #elif !defined(FC_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES) 114 115 typedef int fc_atomic_int_t; 116 #define FC_ATOMIC_INT_FORMAT "d" 117 #define fc_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V)) 118 119 #define fc_atomic_ptr_get(P) (void *) (__sync_fetch_and_add ((P), 0)) 120 #define fc_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N)) 121 122 123 #elif !defined(FC_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS) 124 125 #include <atomic.h> 126 #include <mbarrier.h> 127 128 typedef unsigned int fc_atomic_int_t; 129 #define FC_ATOMIC_INT_FORMAT "u" 130 #define fc_atomic_int_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V)) 131 132 #define fc_atomic_ptr_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P)) 133 #define fc_atomic_ptr_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((P), (O), (N)) == (void *) (O) ? FcTrue : FcFalse) 134 135 136 #elif !defined(FC_NO_MT) 137 138 #define FC_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */ 139 typedef volatile int fc_atomic_int_t; 140 #define FC_ATOMIC_INT_FORMAT "d" 141 #define fc_atomic_int_add(AI, V) (((AI) += (V)) - (V)) 142 143 #define fc_atomic_ptr_get(P) ((void *) *(P)) 144 #define fc_atomic_ptr_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), FcTrue) : FcFalse) 145 146 147 #else /* FC_NO_MT */ 148 149 typedef int fc_atomic_int_t; 150 #define FC_ATOMIC_INT_FORMAT "d" 151 #define fc_atomic_int_add(AI, V) (((AI) += (V)) - (V)) 152 153 #define fc_atomic_ptr_get(P) ((void *) *(P)) 154 #define fc_atomic_ptr_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), FcTrue) : FcFalse) 155 156 #endif 157 158 /* reference count */ 159 #ifndef FC_REF_CONSTANT_VALUE 160 #define FC_REF_CONSTANT_VALUE ((fc_atomic_int_t) -1) 161 #endif 162 #define FC_REF_CONSTANT {FC_REF_CONSTANT_VALUE} 163 typedef struct _FcRef { fc_atomic_int_t count; } FcRef; 164 static inline void FcRefInit (FcRef *r, int v) { r->count = v; } 165 static inline int FcRefInc (FcRef *r) { return fc_atomic_int_add (r->count, +1); } 166 static inline int FcRefDec (FcRef *r) { return fc_atomic_int_add (r->count, -1); } 167 static inline int FcRefAdd (FcRef *r, int v) { return fc_atomic_int_add (r->count, v); } 168 static inline void FcRefSetConst (FcRef *r) { r->count = FC_REF_CONSTANT_VALUE; } 169 static inline FcBool FcRefIsConst (const FcRef *r) { return r->count == FC_REF_CONSTANT_VALUE; } 170 171 #endif /* _FCATOMIC_H_ */ 172
Indexes created Sat Jul 04 00:25:45 UTC 2026