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comparison 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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1:1d09e1dec1d9 2:b50eed0cc0ef
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_HH
33 #define HB_ATOMIC_HH
34
35 #include "hb.hh"
36 #include "hb-meta.hh"
37
38
39 /*
40 * Atomic integers and pointers.
41 */
42
43
44 /* We need external help for these */
45
46 #if defined(hb_atomic_int_impl_add) \
47 && defined(hb_atomic_ptr_impl_get) \
48 && defined(hb_atomic_ptr_impl_cmpexch)
49
50 /* Defined externally, i.e. in config.h. */
51
52
53 #elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE)
54
55 /* C++11-style GCC primitives. We prefer these as they don't require linking to libstdc++ / libc++. */
56
57 #define _hb_memory_barrier() __sync_synchronize ()
58
59 #define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add ((AI), (V), __ATOMIC_ACQ_REL)
60 #define hb_atomic_int_impl_set_relaxed(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELAXED)
61 #define hb_atomic_int_impl_set(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELEASE)
62 #define hb_atomic_int_impl_get_relaxed(AI) __atomic_load_n ((AI), __ATOMIC_RELAXED)
63 #define hb_atomic_int_impl_get(AI) __atomic_load_n ((AI), __ATOMIC_ACQUIRE)
64
65 #define hb_atomic_ptr_impl_set_relaxed(P, V) __atomic_store_n ((P), (V), __ATOMIC_RELAXED)
66 #define hb_atomic_ptr_impl_get_relaxed(P) __atomic_load_n ((P), __ATOMIC_RELAXED)
67 #define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE)
68 static inline bool
69 _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
70 {
71 const void *O = O_; // Need lvalue
72 return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
73 }
74 #define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
75
76
77 #elif !defined(HB_NO_MT)
78
79 /* C++11 atomics. */
80
81 #include <atomic>
82
83 #define _hb_memory_barrier() std::atomic_thread_fence(std::memory_order_ack_rel)
84 #define _hb_memory_r_barrier() std::atomic_thread_fence(std::memory_order_acquire)
85 #define _hb_memory_w_barrier() std::atomic_thread_fence(std::memory_order_release)
86
87 #define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->fetch_add ((V), std::memory_order_acq_rel))
88 #define hb_atomic_int_impl_set_relaxed(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_relaxed))
89 #define hb_atomic_int_impl_set(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_release))
90 #define hb_atomic_int_impl_get_relaxed(AI) (reinterpret_cast<std::atomic<int> const *> (AI)->load (std::memory_order_relaxed))
91 #define hb_atomic_int_impl_get(AI) (reinterpret_cast<std::atomic<int> const *> (AI)->load (std::memory_order_acquire))
92
93 #define hb_atomic_ptr_impl_set_relaxed(P, V) (reinterpret_cast<std::atomic<void*> *> (P)->store ((V), std::memory_order_relaxed))
94 #define hb_atomic_ptr_impl_get_relaxed(P) (reinterpret_cast<std::atomic<void*> const *> (P)->load (std::memory_order_relaxed))
95 #define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire))
96 static inline bool
97 _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
98 {
99 const void *O = O_; // Need lvalue
100 return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed);
101 }
102 #define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
103
104
105 #else /* defined(HB_NO_MT) */
106
107 #define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
108 #define _hb_memory_barrier() do {} while (0)
109 #define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
110
111 #endif
112
113
114 #ifndef _hb_compiler_memory_r_barrier
115 /* This we always use std::atomic for; and should never be disabled...
116 * except that MSVC gives me an internal compiler error on it. */
117 #if !defined(_MSC_VER)
118 #include <atomic>
119 #define _hb_compiler_memory_r_barrier() std::atomic_signal_fence (std::memory_order_acquire)
120 #else
121 #define _hb_compiler_memory_r_barrier() do {} while (0)
122 #endif
123 #endif
124
125
126
127 #ifndef _hb_memory_r_barrier
128 #define _hb_memory_r_barrier() _hb_memory_barrier ()
129 #endif
130 #ifndef _hb_memory_w_barrier
131 #define _hb_memory_w_barrier() _hb_memory_barrier ()
132 #endif
133 #ifndef hb_atomic_int_impl_set_relaxed
134 #define hb_atomic_int_impl_set_relaxed(AI, V) (*(AI) = (V))
135 #endif
136 #ifndef hb_atomic_int_impl_get_relaxed
137 #define hb_atomic_int_impl_get_relaxed(AI) (*(AI))
138 #endif
139
140 #ifndef hb_atomic_ptr_impl_set_relaxed
141 #define hb_atomic_ptr_impl_set_relaxed(P, V) (*(P) = (V))
142 #endif
143 #ifndef hb_atomic_ptr_impl_get_relaxed
144 #define hb_atomic_ptr_impl_get_relaxed(P) (*(P))
145 #endif
146 #ifndef hb_atomic_int_impl_set
147 inline void hb_atomic_int_impl_set (int *AI, int v) { _hb_memory_w_barrier (); *AI = v; }
148 #endif
149 #ifndef hb_atomic_int_impl_get
150 inline int hb_atomic_int_impl_get (const int *AI) { int v = *AI; _hb_memory_r_barrier (); return v; }
151 #endif
152 #ifndef hb_atomic_ptr_impl_get
153 inline void *hb_atomic_ptr_impl_get (void ** const P) { void *v = *P; _hb_memory_r_barrier (); return v; }
154 #endif
155
156
157 struct hb_atomic_int_t
158 {
159 hb_atomic_int_t () = default;
160 constexpr hb_atomic_int_t (int v) : v (v) {}
161
162 hb_atomic_int_t& operator = (int v_) { set_relaxed (v_); return *this; }
163 operator int () const { return get_relaxed (); }
164
165 void set_relaxed (int v_) { hb_atomic_int_impl_set_relaxed (&v, v_); }
166 void set_release (int v_) { hb_atomic_int_impl_set (&v, v_); }
167 int get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); }
168 int get_acquire () const { return hb_atomic_int_impl_get (&v); }
169 int inc () { return hb_atomic_int_impl_add (&v, 1); }
170 int dec () { return hb_atomic_int_impl_add (&v, -1); }
171
172 int v = 0;
173 };
174
175 template <typename P>
176 struct hb_atomic_ptr_t
177 {
178 typedef hb_remove_pointer<P> T;
179
180 hb_atomic_ptr_t () = default;
181 constexpr hb_atomic_ptr_t (T* v) : v (v) {}
182
183 void init (T* v_ = nullptr) { set_relaxed (v_); }
184 void set_relaxed (T* v_) { hb_atomic_ptr_impl_set_relaxed (&v, v_); }
185 T *get_relaxed () const { return (T *) hb_atomic_ptr_impl_get_relaxed (&v); }
186 T *get_acquire () const { return (T *) hb_atomic_ptr_impl_get ((void **) &v); }
187 bool cmpexch (const T *old, T *new_) const { return hb_atomic_ptr_impl_cmpexch ((void **) &v, (void *) old, (void *) new_); }
188
189 T * operator -> () const { return get_acquire (); }
190 template <typename C> operator C * () const { return get_acquire (); }
191
192 T *v = nullptr;
193 };
194
195
196 #endif /* HB_ATOMIC_HH */