1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 // This file is available under and governed by the GNU General Public
26 // License version 2 only, as published by the Free Software Foundation.
27 // However, the following notice accompanied the original version of this
28 // file:
29 //
30 /*
31 * Copyright © 2007 Chris Wilson
32 * Copyright © 2009,2010 Red Hat, Inc.
33 * Copyright © 2011,2012 Google, Inc.
34 *
35 * This is part of HarfBuzz, a text shaping library.
36 *
37 * Permission is hereby granted, without written agreement and without
38 * license or royalty fees, to use, copy, modify, and distribute this
39 * software and its documentation for any purpose, provided that the
40 * above copyright notice and the following two paragraphs appear in
41 * all copies of this software.
42 *
43 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
44 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
45 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
46 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
47 * DAMAGE.
48 *
49 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
50 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
51 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
52 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
53 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
54 *
55 * Contributor(s):
56 * Chris Wilson <chris@chris-wilson.co.uk>
57 * Red Hat Author(s): Behdad Esfahbod
58 * Google Author(s): Behdad Esfahbod
59 */
60
61 #ifndef HB_ATOMIC_PRIVATE_HH
62 #define HB_ATOMIC_PRIVATE_HH
63
64 #include "hb-private.hh"
65
66
67 /* atomic_int */
68
69 /* We need external help for these */
70
71 #if defined(hb_atomic_int_impl_add) \
72 && defined(hb_atomic_ptr_impl_get) \
73 && defined(hb_atomic_ptr_impl_cmpexch)
74
75 /* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
76
77
78 #elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
79
80 #include <windows.h>
81
82 /* MinGW has a convoluted history of supporting MemoryBarrier
83 * properly. As such, define a function to wrap the whole
84 * thing. */
85 static inline void _HBMemoryBarrier (void) {
86 #if !defined(MemoryBarrier)
87 long dummy = 0;
88 InterlockedExchange (&dummy, 1);
89 #else
90 MemoryBarrier ();
91 #endif
92 }
93
94 typedef LONG hb_atomic_int_impl_t;
95 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
96 #define hb_atomic_int_impl_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
97
98 #define hb_atomic_ptr_impl_get(P) (_HBMemoryBarrier (), (void *) *(P))
99 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
100
101
102 #elif !defined(HB_NO_MT) && defined(__APPLE__)
103
104 #include <libkern/OSAtomic.h>
105 #ifdef __MAC_OS_X_MIN_REQUIRED
106 #include <AvailabilityMacros.h>
107 #elif defined(__IPHONE_OS_MIN_REQUIRED)
108 #include <Availability.h>
109 #endif
110
111
112 typedef int32_t hb_atomic_int_impl_t;
113 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
114 #define hb_atomic_int_impl_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
115
116 #define hb_atomic_ptr_impl_get(P) (OSMemoryBarrier (), (void *) *(P))
117 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
118 #define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
119 #else
120 #if __ppc64__ || __x86_64__ || __aarch64__
121 #define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
122 #else
123 #define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
124 #endif
125 #endif
126
127
128 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
129
130 typedef int hb_atomic_int_impl_t;
131 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
132 #define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add (&(AI), (V))
133
134 #define hb_atomic_ptr_impl_get(P) (void *) (__sync_synchronize (), *(P))
135 #define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
136
137
138 #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
139
140 #include <atomic.h>
141 #include <mbarrier.h>
142
143 typedef unsigned int hb_atomic_int_impl_t;
144 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
145 #define hb_atomic_int_impl_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
146
147 #define hb_atomic_ptr_impl_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
148 #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)
149
150
151 #elif !defined(HB_NO_MT)
152
153 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
154
155 typedef volatile int hb_atomic_int_impl_t;
156 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
157 #define hb_atomic_int_impl_add(AI, V) (((AI) += (V)) - (V))
158
159 #define hb_atomic_ptr_impl_get(P) ((void *) *(P))
160 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
161
162
163 #else /* HB_NO_MT */
164
165 typedef int hb_atomic_int_impl_t;
166 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
167 #define hb_atomic_int_impl_add(AI, V) (((AI) += (V)) - (V))
168
169 #define hb_atomic_ptr_impl_get(P) ((void *) *(P))
170 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
171
172
173 #endif
174
175
176 #define HB_ATOMIC_INT_INIT(V) {HB_ATOMIC_INT_IMPL_INIT(V)}
177
178 struct hb_atomic_int_t
179 {
180 hb_atomic_int_impl_t v;
181
182 inline void set_unsafe (int v_) { v = v_; }
183 inline int get_unsafe (void) const { return v; }
184 inline int inc (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (v), 1); }
185 inline int dec (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (v), -1); }
186 };
187
188
189 #define hb_atomic_ptr_get(P) hb_atomic_ptr_impl_get(P)
190 #define hb_atomic_ptr_cmpexch(P,O,N) hb_atomic_ptr_impl_cmpexch((P),(O),(N))
191
192
193 #endif /* HB_ATOMIC_PRIVATE_HH */