hb-atomic-private.hh revision 0bb31e4497523442fbb26bbd55b194ab70205ca4 
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)
51static inline void _HBMemoryBarrier (void) {
52  long dummy = 0;
53  InterlockedExchange (&dummy, 1);
54}
55# define MemoryBarrier _HBMemoryBarrier
56#endif
57
58typedef 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
74typedef 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__ || __arm64__
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
91typedef 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
103typedef 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. */
113typedef 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
122typedef 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