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annotate mupdf-source/thirdparty/harfbuzz/src/hb-atomic.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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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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32 #ifndef HB_ATOMIC_HH
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33 #define HB_ATOMIC_HH
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35 #include "hb.hh"
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36 #include "hb-meta.hh"
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39 /*
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40 * Atomic integers and pointers.
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41 */
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44 /* We need external help for these */
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46 #if defined(hb_atomic_int_impl_add) \
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47 && defined(hb_atomic_ptr_impl_get) \
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48 && defined(hb_atomic_ptr_impl_cmpexch)
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50 /* Defined externally, i.e. in config.h. */
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53 #elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE)
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55 /* C++11-style GCC primitives. We prefer these as they don't require linking to libstdc++ / libc++. */
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57 #define _hb_memory_barrier() __sync_synchronize ()
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59 #define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add ((AI), (V), __ATOMIC_ACQ_REL)
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60 #define hb_atomic_int_impl_set_relaxed(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELAXED)
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61 #define hb_atomic_int_impl_set(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELEASE)
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62 #define hb_atomic_int_impl_get_relaxed(AI) __atomic_load_n ((AI), __ATOMIC_RELAXED)
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63 #define hb_atomic_int_impl_get(AI) __atomic_load_n ((AI), __ATOMIC_ACQUIRE)
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65 #define hb_atomic_ptr_impl_set_relaxed(P, V) __atomic_store_n ((P), (V), __ATOMIC_RELAXED)
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66 #define hb_atomic_ptr_impl_get_relaxed(P) __atomic_load_n ((P), __ATOMIC_RELAXED)
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67 #define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE)
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68 static inline bool
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69 _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
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70 {
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71 const void *O = O_; // Need lvalue
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72 return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
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73 }
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74 #define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
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77 #elif !defined(HB_NO_MT)
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79 /* C++11 atomics. */
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81 #include <atomic>
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83 #define _hb_memory_barrier() std::atomic_thread_fence(std::memory_order_ack_rel)
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84 #define _hb_memory_r_barrier() std::atomic_thread_fence(std::memory_order_acquire)
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85 #define _hb_memory_w_barrier() std::atomic_thread_fence(std::memory_order_release)
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87 #define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->fetch_add ((V), std::memory_order_acq_rel))
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88 #define hb_atomic_int_impl_set_relaxed(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_relaxed))
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89 #define hb_atomic_int_impl_set(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_release))
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90 #define hb_atomic_int_impl_get_relaxed(AI) (reinterpret_cast<std::atomic<int> const *> (AI)->load (std::memory_order_relaxed))
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91 #define hb_atomic_int_impl_get(AI) (reinterpret_cast<std::atomic<int> const *> (AI)->load (std::memory_order_acquire))
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93 #define hb_atomic_ptr_impl_set_relaxed(P, V) (reinterpret_cast<std::atomic<void*> *> (P)->store ((V), std::memory_order_relaxed))
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94 #define hb_atomic_ptr_impl_get_relaxed(P) (reinterpret_cast<std::atomic<void*> const *> (P)->load (std::memory_order_relaxed))
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95 #define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire))
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96 static inline bool
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97 _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
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98 {
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99 const void *O = O_; // Need lvalue
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100 return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed);
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101 }
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102 #define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
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103
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104
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105 #else /* defined(HB_NO_MT) */
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106
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107 #define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
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108 #define _hb_memory_barrier() do {} while (0)
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109 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
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110
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111 #endif
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112
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113
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114 #ifndef _hb_compiler_memory_r_barrier
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115 /* This we always use std::atomic for; and should never be disabled...
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116 * except that MSVC gives me an internal compiler error on it. */
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117 #if !defined(_MSC_VER)
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118 #include <atomic>
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119 #define _hb_compiler_memory_r_barrier() std::atomic_signal_fence (std::memory_order_acquire)
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120 #else
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121 #define _hb_compiler_memory_r_barrier() do {} while (0)
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122 #endif
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123 #endif
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124
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125
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126
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127 #ifndef _hb_memory_r_barrier
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128 #define _hb_memory_r_barrier() _hb_memory_barrier ()
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129 #endif
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130 #ifndef _hb_memory_w_barrier
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131 #define _hb_memory_w_barrier() _hb_memory_barrier ()
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132 #endif
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133 #ifndef hb_atomic_int_impl_set_relaxed
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134 #define hb_atomic_int_impl_set_relaxed(AI, V) (*(AI) = (V))
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135 #endif
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136 #ifndef hb_atomic_int_impl_get_relaxed
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137 #define hb_atomic_int_impl_get_relaxed(AI) (*(AI))
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138 #endif
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139
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140 #ifndef hb_atomic_ptr_impl_set_relaxed
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141 #define hb_atomic_ptr_impl_set_relaxed(P, V) (*(P) = (V))
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142 #endif
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143 #ifndef hb_atomic_ptr_impl_get_relaxed
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144 #define hb_atomic_ptr_impl_get_relaxed(P) (*(P))
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145 #endif
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146 #ifndef hb_atomic_int_impl_set
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147 inline void hb_atomic_int_impl_set (int *AI, int v) { _hb_memory_w_barrier (); *AI = v; }
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148 #endif
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149 #ifndef hb_atomic_int_impl_get
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150 inline int hb_atomic_int_impl_get (const int *AI) { int v = *AI; _hb_memory_r_barrier (); return v; }
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151 #endif
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152 #ifndef hb_atomic_ptr_impl_get
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153 inline void *hb_atomic_ptr_impl_get (void ** const P) { void *v = *P; _hb_memory_r_barrier (); return v; }
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154 #endif
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155
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156
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157 struct hb_atomic_int_t
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158 {
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159 hb_atomic_int_t () = default;
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160 constexpr hb_atomic_int_t (int v) : v (v) {}
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161
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162 hb_atomic_int_t& operator = (int v_) { set_relaxed (v_); return *this; }
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163 operator int () const { return get_relaxed (); }
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164
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165 void set_relaxed (int v_) { hb_atomic_int_impl_set_relaxed (&v, v_); }
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166 void set_release (int v_) { hb_atomic_int_impl_set (&v, v_); }
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167 int get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); }
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168 int get_acquire () const { return hb_atomic_int_impl_get (&v); }
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169 int inc () { return hb_atomic_int_impl_add (&v, 1); }
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170 int dec () { return hb_atomic_int_impl_add (&v, -1); }
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171
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172 int v = 0;
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173 };
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174
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175 template <typename P>
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176 struct hb_atomic_ptr_t
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177 {
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178 typedef hb_remove_pointer<P> T;
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179
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180 hb_atomic_ptr_t () = default;
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181 constexpr hb_atomic_ptr_t (T* v) : v (v) {}
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182
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183 void init (T* v_ = nullptr) { set_relaxed (v_); }
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184 void set_relaxed (T* v_) { hb_atomic_ptr_impl_set_relaxed (&v, v_); }
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185 T *get_relaxed () const { return (T *) hb_atomic_ptr_impl_get_relaxed (&v); }
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186 T *get_acquire () const { return (T *) hb_atomic_ptr_impl_get ((void **) &v); }
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187 bool cmpexch (const T *old, T *new_) const { return hb_atomic_ptr_impl_cmpexch ((void **) &v, (void *) old, (void *) new_); }
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188
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189 T * operator -> () const { return get_acquire (); }
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190 template <typename C> operator C * () const { return get_acquire (); }
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192 T *v = nullptr;
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193 };
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196 #endif /* HB_ATOMIC_HH */