2 * Copyright © 2007 Chris Wilson
3 * Copyright © 2009,2010 Red Hat, Inc.
4 * Copyright © 2011,2012 Google, Inc.
6 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
27 * Chris Wilson <chris@chris-wilson.co.uk>
28 * Red Hat Author(s): Behdad Esfahbod
29 * Google Author(s): Behdad Esfahbod
32 #ifndef HB_ATOMIC_PRIVATE_HH
33 #define HB_ATOMIC_PRIVATE_HH
35 #include "hb-private.hh"
40 /* We need external help for these */
42 #if defined(hb_atomic_int_impl_add) \
43 && defined(hb_atomic_ptr_impl_get) \
44 && defined(hb_atomic_ptr_impl_cmpexch)
46 /* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
49 #elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
53 /* MinGW has a convoluted history of supporting MemoryBarrier
54 * properly. As such, define a function to wrap the whole
56 static inline void _HBMemoryBarrier (void) {
57 #if !defined(MemoryBarrier)
59 InterlockedExchange (&dummy, 1);
65 typedef LONG hb_atomic_int_impl_t;
66 #define hb_atomic_int_impl_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
68 #define hb_atomic_ptr_impl_get(P) (_HBMemoryBarrier (), (void *) *(P))
69 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
72 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
74 typedef int hb_atomic_int_impl_t;
75 #define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add (&(AI), (V))
77 #define hb_atomic_ptr_impl_get(P) (void *) (__sync_synchronize (), *(P))
78 #define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
81 #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
86 typedef unsigned int hb_atomic_int_impl_t;
87 #define hb_atomic_int_impl_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
89 #define hb_atomic_ptr_impl_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
90 #define hb_atomic_ptr_impl_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
93 #elif !defined(HB_NO_MT) && defined(__APPLE__)
95 #include <libkern/OSAtomic.h>
96 #ifdef __MAC_OS_X_MIN_REQUIRED
97 #include <AvailabilityMacros.h>
98 #elif defined(__IPHONE_OS_MIN_REQUIRED)
99 #include <Availability.h>
103 typedef int32_t hb_atomic_int_impl_t;
104 #define hb_atomic_int_impl_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
106 #define hb_atomic_ptr_impl_get(P) (OSMemoryBarrier (), (void *) *(P))
107 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
108 #define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
110 #if __ppc64__ || __x86_64__ || __aarch64__
111 #define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (void *) (O), (int64_t) (void *) (N), (int64_t*) (P))
113 #define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (void *) (O), (int32_t) (void *) (N), (int32_t*) (P))
118 #elif !defined(HB_NO_MT) && defined(_AIX) && defined(__IBMCPP__)
120 #include <builtins.h>
123 static inline int _hb_fetch_and_add(volatile int* AI, unsigned int V) {
125 int result = __fetch_and_add(AI, V);
129 static inline int _hb_compare_and_swaplp(volatile long* P, long O, long N) {
131 int result = __compare_and_swaplp (P, &O, N);
136 typedef int hb_atomic_int_impl_t;
137 #define hb_atomic_int_impl_add(AI, V) _hb_fetch_and_add (&(AI), (V))
139 #define hb_atomic_ptr_impl_get(P) (__sync(), (void *) *(P))
140 #define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_compare_and_swaplp ((long*)(P), (long)(O), (long)(N))
142 #elif !defined(HB_NO_MT)
144 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
146 typedef volatile int hb_atomic_int_impl_t;
147 #define hb_atomic_int_impl_add(AI, V) (((AI) += (V)) - (V))
149 #define hb_atomic_ptr_impl_get(P) ((void *) *(P))
150 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
155 typedef int hb_atomic_int_impl_t;
156 #define hb_atomic_int_impl_add(AI, V) (((AI) += (V)) - (V))
158 #define hb_atomic_ptr_impl_get(P) ((void *) *(P))
159 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
165 #define HB_ATOMIC_INT_INIT(V) {V}
167 struct hb_atomic_int_t
169 hb_atomic_int_impl_t v;
171 inline void set_unsafe (int v_) { v = v_; }
172 inline int get_unsafe (void) const { return v; }
173 inline int inc (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (v), 1); }
174 inline int dec (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (v), -1); }
178 #define hb_atomic_ptr_get(P) hb_atomic_ptr_impl_get(P)
179 #define hb_atomic_ptr_cmpexch(P,O,N) hb_atomic_ptr_impl_cmpexch((P),(O),(N))
182 #endif /* HB_ATOMIC_PRIVATE_HH */