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@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 #if defined(__MINGW32__) && !defined(MemoryBarrier)
_HBMemoryBarrier(void)51 static inline void _HBMemoryBarrier (void) {
52 long dummy = 0;
53 InterlockedExchange (&dummy, 1);
54 }
55 # define MemoryBarrier _HBMemoryBarrier
56 #endif
57
58 typedef LONG hb_atomic_int_t;
59 #define hb_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
60
61 #define hb_atomic_ptr_get(P) (MemoryBarrier (), (void *) *(P))
62 #define hb_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
63
64
65 #elif !defined(HB_NO_MT) && defined(__APPLE__)
66
67 #include <libkern/OSAtomic.h>
68 #ifdef __MAC_OS_X_MIN_REQUIRED
69 #include <AvailabilityMacros.h>
70 #elif defined(__IPHONE_OS_MIN_REQUIRED)
71 #include <Availability.h>
72 #endif
73
74 typedef int32_t hb_atomic_int_t;
75 #define hb_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
76
77 #define hb_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P))
78 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
79 #define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
80 #else
81 #if __ppc64__ || __x86_64__
82 #define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
83 #else
84 #define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
85 #endif
86 #endif
87
88
89 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
90
91 typedef int hb_atomic_int_t;
92 #define hb_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V))
93
94 #define hb_atomic_ptr_get(P) (void *) (__sync_synchronize (), *(P))
95 #define hb_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
96
97
98 #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
99
100 #include <atomic.h>
101 #include <mbarrier.h>
102
103 typedef unsigned int hb_atomic_int_t;
104 #define hb_atomic_int_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
105
106 #define hb_atomic_ptr_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
107 #define hb_atomic_ptr_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
108
109
110 #elif !defined(HB_NO_MT)
111
112 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
113 typedef volatile int hb_atomic_int_t;
114 #define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
115
116 #define hb_atomic_ptr_get(P) ((void *) *(P))
117 #define hb_atomic_ptr_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
118
119
120 #else /* HB_NO_MT */
121
122 typedef int hb_atomic_int_t;
123 #define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
124
125 #define hb_atomic_ptr_get(P) ((void *) *(P))
126 #define hb_atomic_ptr_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
127
128 #endif
129
130 /* TODO Add tracing. */
131
132 #endif /* HB_ATOMIC_PRIVATE_HH */
133