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comparison: gfx/harfbuzz/src/hb-mutex-private.hh
gfx/harfbuzz/src/hb-mutex-private.hh
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| -1:000000000000 | 0:38776229b6a8 |
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| 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_MUTEX_PRIVATE_HH | |
| 33 #define HB_MUTEX_PRIVATE_HH | |
| 34 | |
| 35 #include "hb-private.hh" | |
| 36 | |
| 37 | |
| 38 /* mutex */ | |
| 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 typedef CRITICAL_SECTION hb_mutex_impl_t; | |
| 50 #define HB_MUTEX_IMPL_INIT { NULL, 0, 0, NULL, NULL, 0 } | |
| 51 #define hb_mutex_impl_init(M) InitializeCriticalSection (M) | |
| 52 #define hb_mutex_impl_lock(M) EnterCriticalSection (M) | |
| 53 #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M) | |
| 54 #define hb_mutex_impl_finish(M) DeleteCriticalSection (M) | |
| 55 | |
| 56 | |
| 57 #elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__)) | |
| 58 | |
| 59 #include <pthread.h> | |
| 60 typedef pthread_mutex_t hb_mutex_impl_t; | |
| 61 #define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER | |
| 62 #define hb_mutex_impl_init(M) pthread_mutex_init (M, NULL) | |
| 63 #define hb_mutex_impl_lock(M) pthread_mutex_lock (M) | |
| 64 #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M) | |
| 65 #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M) | |
| 66 | |
| 67 | |
| 68 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES) | |
| 69 | |
| 70 #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD) | |
| 71 # include <sched.h> | |
| 72 # define HB_SCHED_YIELD() sched_yield () | |
| 73 #else | |
| 74 # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END | |
| 75 #endif | |
| 76 | |
| 77 /* This actually is not a totally awful implementation. */ | |
| 78 typedef volatile int hb_mutex_impl_t; | |
| 79 #define HB_MUTEX_IMPL_INIT 0 | |
| 80 #define hb_mutex_impl_init(M) *(M) = 0 | |
| 81 #define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END | |
| 82 #define hb_mutex_impl_unlock(M) __sync_lock_release (M) | |
| 83 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END | |
| 84 | |
| 85 | |
| 86 #elif !defined(HB_NO_MT) | |
| 87 | |
| 88 #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD) | |
| 89 # include <sched.h> | |
| 90 # define HB_SCHED_YIELD() sched_yield () | |
| 91 #else | |
| 92 # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END | |
| 93 #endif | |
| 94 | |
| 95 #define HB_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */ | |
| 96 typedef volatile int hb_mutex_impl_t; | |
| 97 #define HB_MUTEX_IMPL_INIT 0 | |
| 98 #define hb_mutex_impl_init(M) *(M) = 0 | |
| 99 #define hb_mutex_impl_lock(M) HB_STMT_START { while (*(M)) HB_SCHED_YIELD (); (*(M))++; } HB_STMT_END | |
| 100 #define hb_mutex_impl_unlock(M) (*(M))--; | |
| 101 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END | |
| 102 | |
| 103 | |
| 104 #else /* HB_NO_MT */ | |
| 105 | |
| 106 typedef int hb_mutex_impl_t; | |
| 107 #define HB_MUTEX_IMPL_INIT 0 | |
| 108 #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END | |
| 109 #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END | |
| 110 #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END | |
| 111 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END | |
| 112 | |
| 113 #endif | |
| 114 | |
| 115 | |
| 116 #define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT} | |
| 117 struct hb_mutex_t | |
| 118 { | |
| 119 /* TODO Add tracing. */ | |
| 120 | |
| 121 hb_mutex_impl_t m; | |
| 122 | |
| 123 inline void init (void) { hb_mutex_impl_init (&m); } | |
| 124 inline void lock (void) { hb_mutex_impl_lock (&m); } | |
| 125 inline void unlock (void) { hb_mutex_impl_unlock (&m); } | |
| 126 inline void finish (void) { hb_mutex_impl_finish (&m); } | |
| 127 }; | |
| 128 | |
| 129 | |
| 130 #endif /* HB_MUTEX_PRIVATE_HH */ |
