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#include <windows.h>
48
49/* MinGW has a convoluted history of supporting MemoryBarrier
50 * properly.  As such, define a function to wrap the whole
51 * thing. */
52static inline void _HBMemoryBarrier (void) {
53#if !defined(MemoryBarrier)
54  long dummy = 0;
55  InterlockedExchange (&dummy, 1);
56#else
57  MemoryBarrier ();
58#endif
59}
60
61typedef LONG hb_atomic_int_t;
62#define hb_atomic_int_add(AI, V)	InterlockedExchangeAdd (&(AI), (V))
63
64#define hb_atomic_ptr_get(P)		(_HBMemoryBarrier (), (void *) *(P))
65#define hb_atomic_ptr_cmpexch(P,O,N)	(InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
66
67
68#elif !defined(HB_NO_MT) && defined(__APPLE__)
69
70#include <libkern/OSAtomic.h>
71#ifdef __MAC_OS_X_MIN_REQUIRED
72#include <AvailabilityMacros.h>
73#elif defined(__IPHONE_OS_MIN_REQUIRED)
74#include <Availability.h>
75#endif
76
77typedef int32_t hb_atomic_int_t;
78#define hb_atomic_int_add(AI, V)	(OSAtomicAdd32Barrier ((V), &(AI)) - (V))
79
80#define hb_atomic_ptr_get(P)		(OSMemoryBarrier (), (void *) *(P))
81#if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
82#define hb_atomic_ptr_cmpexch(P,O,N)	OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
83#else
84#if __ppc64__ || __x86_64__ || __aarch64__
85#define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
86#else
87#define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
88#endif
89#endif
90
91
92#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
93
94typedef int hb_atomic_int_t;
95#define hb_atomic_int_add(AI, V)	__sync_fetch_and_add (&(AI), (V))
96
97#define hb_atomic_ptr_get(P)		(void *) (__sync_synchronize (), *(P))
98#define hb_atomic_ptr_cmpexch(P,O,N)	__sync_bool_compare_and_swap ((P), (O), (N))
99
100
101#elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
102
103#include <atomic.h>
104#include <mbarrier.h>
105
106typedef unsigned int hb_atomic_int_t;
107#define hb_atomic_int_add(AI, V)	( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
108
109#define hb_atomic_ptr_get(P)		( ({__machine_rw_barrier ();}), (void *) *(P))
110#define hb_atomic_ptr_cmpexch(P,O,N)	( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
111
112
113#elif !defined(HB_NO_MT)
114
115#define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
116typedef volatile int hb_atomic_int_t;
117#define hb_atomic_int_add(AI, V)	(((AI) += (V)) - (V))
118
119#define hb_atomic_ptr_get(P)		((void *) *(P))
120#define hb_atomic_ptr_cmpexch(P,O,N)	(* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
121
122
123#else /* HB_NO_MT */
124
125typedef int hb_atomic_int_t;
126#define hb_atomic_int_add(AI, V)	(((AI) += (V)) - (V))
127
128#define hb_atomic_ptr_get(P)		((void *) *(P))
129#define hb_atomic_ptr_cmpexch(P,O,N)	(* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
130
131#endif
132
133/* TODO Add tracing. */
134
135#endif /* HB_ATOMIC_PRIVATE_HH */
136