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86951993 | 1 | // <atomic> compatibility -*- C++ -*- |
d466a7e2 | 2 | |
8d9254fc | 3 | // Copyright (C) 2008-2020 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
d466a7e2 | 19 | |
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20 | // You should have received a copy of the GNU General Public License and |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
d466a7e2 | 24 | |
ed0840ba | 25 | #include "gstdint.h" |
afd88205 | 26 | #include <atomic> |
1a6e6753 | 27 | #include <mutex> |
d466a7e2 | 28 | |
86951993 AM |
29 | // XXX GLIBCXX_ABI Deprecated |
30 | // gcc-4.7.0 | |
31 | ||
ac6d1200 | 32 | #ifdef _GLIBCXX_SHARED |
0b284728 | 33 | |
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34 | #define LOGSIZE 4 |
35 | ||
36 | namespace | |
37 | { | |
b0c2c850 | 38 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
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39 | std::mutex& |
40 | get_atomic_mutex() | |
41 | { | |
42 | static std::mutex atomic_mutex; | |
43 | return atomic_mutex; | |
44 | } | |
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45 | #endif |
46 | ||
afd88205 | 47 | std::__atomic_flag_base flag_table[ 1 << LOGSIZE ] = |
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48 | { |
49 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
50 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
51 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
52 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
53 | }; | |
54 | } // anonymous namespace | |
55 | ||
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56 | namespace std _GLIBCXX_VISIBILITY(default) |
57 | { | |
58 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
53dc5044 | 59 | |
50ce8d3d | 60 | namespace __atomic0 |
d466a7e2 | 61 | { |
86951993 AM |
62 | |
63 | struct atomic_flag : public __atomic_flag_base | |
64 | { | |
65 | bool | |
66 | test_and_set(memory_order) noexcept; | |
f92ab29f | 67 | |
86951993 AM |
68 | void |
69 | clear(memory_order) noexcept; | |
70 | }; | |
71 | ||
50ce8d3d | 72 | bool |
bdc05efb | 73 | atomic_flag::test_and_set(memory_order) noexcept |
50ce8d3d | 74 | { |
b0c2c850 | 75 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
99827523 | 76 | lock_guard<mutex> __lock(get_atomic_mutex()); |
d466a7e2 | 77 | #endif |
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78 | bool result = _M_i; |
79 | _M_i = true; | |
80 | return result; | |
81 | } | |
d466a7e2 | 82 | |
50ce8d3d | 83 | void |
bdc05efb | 84 | atomic_flag::clear(memory_order) noexcept |
50ce8d3d | 85 | { |
b0c2c850 | 86 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
99827523 | 87 | lock_guard<mutex> __lock(get_atomic_mutex()); |
d466a7e2 | 88 | #endif |
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89 | _M_i = false; |
90 | } | |
86951993 | 91 | } // namespace __atomic0 |
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92 | |
93 | _GLIBCXX_BEGIN_EXTERN_C | |
94 | ||
95 | bool | |
96 | atomic_flag_test_and_set_explicit(__atomic_flag_base* __a, | |
97 | memory_order __m) _GLIBCXX_NOTHROW | |
98 | { | |
99 | atomic_flag* d = static_cast<atomic_flag*>(__a); | |
100 | return d->test_and_set(__m); | |
50ce8d3d | 101 | } |
d466a7e2 | 102 | |
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103 | void |
104 | atomic_flag_clear_explicit(__atomic_flag_base* __a, | |
105 | memory_order __m) _GLIBCXX_NOTHROW | |
d466a7e2 | 106 | { |
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107 | atomic_flag* d = static_cast<atomic_flag*>(__a); |
108 | return d->clear(__m); | |
109 | } | |
d466a7e2 | 110 | |
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111 | void |
112 | __atomic_flag_wait_explicit(__atomic_flag_base* __a, | |
113 | memory_order __x) _GLIBCXX_NOTHROW | |
114 | { | |
115 | while (atomic_flag_test_and_set_explicit(__a, __x)) | |
116 | { }; | |
117 | } | |
d466a7e2 | 118 | |
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119 | _GLIBCXX_CONST __atomic_flag_base* |
120 | __atomic_flag_for_address(const volatile void* __z) _GLIBCXX_NOTHROW | |
121 | { | |
122 | uintptr_t __u = reinterpret_cast<uintptr_t>(__z); | |
123 | __u += (__u >> 2) + (__u << 4); | |
124 | __u += (__u >> 7) + (__u << 5); | |
125 | __u += (__u >> 17) + (__u << 13); | |
126 | if (sizeof(uintptr_t) > 4) | |
127 | __u += (__u >> 31); | |
128 | __u &= ~((~uintptr_t(0)) << LOGSIZE); | |
129 | return flag_table + __u; | |
130 | } | |
d466a7e2 | 131 | |
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132 | _GLIBCXX_END_EXTERN_C |
133 | ||
12ffa228 | 134 | _GLIBCXX_END_NAMESPACE_VERSION |
86951993 | 135 | } // namespace std |
afd88205 | 136 | |
0b284728 | 137 | #endif |
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138 | |
139 | // XXX GLIBCXX_ABI Deprecated | |
140 | // gcc-4.5.0 | |
141 | // <atomic> signature changes | |
142 | ||
143 | // The rename syntax for default exported names is | |
144 | // asm (".symver name1,exportedname@GLIBCXX_3.4") | |
145 | // asm (".symver name2,exportedname@@GLIBCXX_3.4.5") | |
146 | // In the future, GLIBCXX_ABI > 6 should remove all uses of | |
147 | // _GLIBCXX_*_SYMVER macros in this file. | |
148 | ||
ac6d1200 | 149 | #if defined(_GLIBCXX_SYMVER_GNU) && defined(_GLIBCXX_SHARED) \ |
c18dc5cc RO |
150 | && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \ |
151 | && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT) | |
ac2e5c89 | 152 | |
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153 | #define _GLIBCXX_ASM_SYMVER(cur, old, version) \ |
154 | asm (".symver " #cur "," #old "@@" #version); | |
155 | ||
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156 | _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag5clearESt12memory_order, _ZNVSt9__atomic011atomic_flag5clearESt12memory_order, GLIBCXX_3.4.11) |
157 | ||
158 | _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag12test_and_setESt12memory_order, _ZNVSt9__atomic011atomic_flag12test_and_setESt12memory_order, GLIBCXX_3.4.11) | |
ac2e5c89 | 159 | |
afd88205 | 160 | #endif |