1 /* |
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2 * Copyright © 2007 Chris Wilson |
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3 * Copyright © 2009,2010 Red Hat, Inc. |
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4 * Copyright © 2011,2012 Google, Inc. |
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5 * |
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6 * This is part of HarfBuzz, a text shaping library. |
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7 * |
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8 * Permission is hereby granted, without written agreement and without |
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9 * license or royalty fees, to use, copy, modify, and distribute this |
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10 * software and its documentation for any purpose, provided that the |
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11 * above copyright notice and the following two paragraphs appear in |
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12 * all copies of this software. |
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13 * |
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14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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18 * DAMAGE. |
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19 * |
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20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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25 * |
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26 * Contributor(s): |
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27 * Chris Wilson <chris@chris-wilson.co.uk> |
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28 * Red Hat Author(s): Behdad Esfahbod |
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29 * Google Author(s): Behdad Esfahbod |
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30 */ |
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31 |
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32 #ifndef HB_MUTEX_PRIVATE_HH |
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33 #define HB_MUTEX_PRIVATE_HH |
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34 |
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35 #include "hb-private.hh" |
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36 |
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37 |
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38 /* mutex */ |
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39 |
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40 /* We need external help for these */ |
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41 |
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42 #if defined(HB_MUTEX_IMPL_INIT) \ |
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43 && defined(hb_mutex_impl_init) \ |
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44 && defined(hb_mutex_impl_lock) \ |
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45 && defined(hb_mutex_impl_unlock) \ |
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46 && defined(hb_mutex_impl_finish) |
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47 |
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48 /* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */ |
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49 |
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50 |
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51 #elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__)) |
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52 |
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53 #include <windows.h> |
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54 typedef CRITICAL_SECTION hb_mutex_impl_t; |
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55 #define HB_MUTEX_IMPL_INIT {0} |
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56 #if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP) |
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57 #define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0) |
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58 #else |
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59 #define hb_mutex_impl_init(M) InitializeCriticalSection (M) |
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60 #endif |
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61 #define hb_mutex_impl_lock(M) EnterCriticalSection (M) |
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62 #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M) |
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63 #define hb_mutex_impl_finish(M) DeleteCriticalSection (M) |
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64 |
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65 |
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66 #elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__)) |
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67 |
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68 #include <pthread.h> |
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69 typedef pthread_mutex_t hb_mutex_impl_t; |
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70 #define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER |
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71 #define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr) |
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72 #define hb_mutex_impl_lock(M) pthread_mutex_lock (M) |
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73 #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M) |
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74 #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M) |
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75 |
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76 |
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77 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES) |
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78 |
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79 #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD) |
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80 # include <sched.h> |
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81 # define HB_SCHED_YIELD() sched_yield () |
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82 #else |
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83 # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END |
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84 #endif |
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85 |
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86 /* This actually is not a totally awful implementation. */ |
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87 typedef volatile int hb_mutex_impl_t; |
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88 #define HB_MUTEX_IMPL_INIT 0 |
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89 #define hb_mutex_impl_init(M) *(M) = 0 |
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90 #define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END |
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91 #define hb_mutex_impl_unlock(M) __sync_lock_release (M) |
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92 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END |
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93 |
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94 |
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95 #elif !defined(HB_NO_MT) |
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96 |
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97 #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD) |
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98 # include <sched.h> |
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99 # define HB_SCHED_YIELD() sched_yield () |
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100 #else |
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101 # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END |
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102 #endif |
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103 |
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104 #define HB_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */ |
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105 typedef volatile int hb_mutex_impl_t; |
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106 #define HB_MUTEX_IMPL_INIT 0 |
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107 #define hb_mutex_impl_init(M) *(M) = 0 |
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108 #define hb_mutex_impl_lock(M) HB_STMT_START { while (*(M)) HB_SCHED_YIELD (); (*(M))++; } HB_STMT_END |
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109 #define hb_mutex_impl_unlock(M) (*(M))--; |
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110 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END |
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111 |
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112 |
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113 #else /* HB_NO_MT */ |
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114 |
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115 typedef int hb_mutex_impl_t; |
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116 #define HB_MUTEX_IMPL_INIT 0 |
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117 #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END |
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118 #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END |
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119 #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END |
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120 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END |
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121 |
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122 |
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123 #endif |
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124 |
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125 |
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126 #define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT} |
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127 |
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128 struct hb_mutex_t |
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129 { |
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130 /* TODO Add tracing. */ |
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131 |
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132 hb_mutex_impl_t m; |
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133 |
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134 inline void init (void) { hb_mutex_impl_init (&m); } |
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135 inline void lock (void) { hb_mutex_impl_lock (&m); } |
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136 inline void unlock (void) { hb_mutex_impl_unlock (&m); } |
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137 inline void fini (void) { hb_mutex_impl_finish (&m); } |
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138 }; |
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139 |
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140 |
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141 #endif /* HB_MUTEX_PRIVATE_HH */ |
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