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1 | // Support for atomic operations -*- C++ -*- |
2 | ||
c18dc5cc | 3 | // Copyright (C) 2008, 2009, 2010 |
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4 | // Free Software Foundation, Inc. |
5 | // | |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
748086b7 | 9 | // Free Software Foundation; either version 3, or (at your option) |
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10 | // any later version. |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
748086b7 JJ |
17 | // Under Section 7 of GPL version 3, you are granted additional |
18 | // permissions described in the GCC Runtime Library Exception, version | |
19 | // 3.1, as published by the Free Software Foundation. | |
d466a7e2 | 20 | |
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21 | // You should have received a copy of the GNU General Public License and |
22 | // a copy of the GCC Runtime Library Exception along with this program; | |
23 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | // <http://www.gnu.org/licenses/>. | |
d466a7e2 | 25 | |
ed0840ba | 26 | #include "gstdint.h" |
afd88205 | 27 | #include <atomic> |
1a6e6753 | 28 | #include <mutex> |
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29 | |
30 | #define LOGSIZE 4 | |
31 | ||
32 | namespace | |
33 | { | |
b0c2c850 | 34 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
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35 | std::mutex& |
36 | get_atomic_mutex() | |
37 | { | |
38 | static std::mutex atomic_mutex; | |
39 | return atomic_mutex; | |
40 | } | |
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41 | #endif |
42 | ||
afd88205 | 43 | std::__atomic_flag_base flag_table[ 1 << LOGSIZE ] = |
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44 | { |
45 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
46 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
47 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
48 | ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, | |
49 | }; | |
50 | } // anonymous namespace | |
51 | ||
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52 | namespace std _GLIBCXX_VISIBILITY(default) |
53 | { | |
54 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
53dc5044 | 55 | |
50ce8d3d | 56 | namespace __atomic0 |
d466a7e2 | 57 | { |
50ce8d3d | 58 | bool |
afd88205 | 59 | atomic_flag::test_and_set(memory_order) |
50ce8d3d | 60 | { |
b0c2c850 | 61 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
99827523 | 62 | lock_guard<mutex> __lock(get_atomic_mutex()); |
d466a7e2 | 63 | #endif |
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64 | bool result = _M_i; |
65 | _M_i = true; | |
66 | return result; | |
67 | } | |
d466a7e2 | 68 | |
50ce8d3d | 69 | void |
afd88205 | 70 | atomic_flag::clear(memory_order) |
50ce8d3d | 71 | { |
b0c2c850 | 72 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
99827523 | 73 | lock_guard<mutex> __lock(get_atomic_mutex()); |
d466a7e2 | 74 | #endif |
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75 | _M_i = false; |
76 | } | |
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77 | |
78 | _GLIBCXX_BEGIN_EXTERN_C | |
79 | ||
80 | bool | |
81 | atomic_flag_test_and_set_explicit(__atomic_flag_base* __a, | |
82 | memory_order __m) _GLIBCXX_NOTHROW | |
83 | { | |
84 | atomic_flag* d = static_cast<atomic_flag*>(__a); | |
85 | return d->test_and_set(__m); | |
50ce8d3d | 86 | } |
d466a7e2 | 87 | |
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88 | void |
89 | atomic_flag_clear_explicit(__atomic_flag_base* __a, | |
90 | memory_order __m) _GLIBCXX_NOTHROW | |
d466a7e2 | 91 | { |
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92 | atomic_flag* d = static_cast<atomic_flag*>(__a); |
93 | return d->clear(__m); | |
94 | } | |
d466a7e2 | 95 | |
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96 | void |
97 | __atomic_flag_wait_explicit(__atomic_flag_base* __a, | |
98 | memory_order __x) _GLIBCXX_NOTHROW | |
99 | { | |
100 | while (atomic_flag_test_and_set_explicit(__a, __x)) | |
101 | { }; | |
102 | } | |
d466a7e2 | 103 | |
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104 | _GLIBCXX_CONST __atomic_flag_base* |
105 | __atomic_flag_for_address(const volatile void* __z) _GLIBCXX_NOTHROW | |
106 | { | |
107 | uintptr_t __u = reinterpret_cast<uintptr_t>(__z); | |
108 | __u += (__u >> 2) + (__u << 4); | |
109 | __u += (__u >> 7) + (__u << 5); | |
110 | __u += (__u >> 17) + (__u << 13); | |
111 | if (sizeof(uintptr_t) > 4) | |
112 | __u += (__u >> 31); | |
113 | __u &= ~((~uintptr_t(0)) << LOGSIZE); | |
114 | return flag_table + __u; | |
115 | } | |
d466a7e2 | 116 | |
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117 | _GLIBCXX_END_EXTERN_C |
118 | ||
119 | } // namespace __atomic0 | |
53dc5044 | 120 | |
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121 | _GLIBCXX_END_NAMESPACE_VERSION |
122 | } // namespace | |
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123 | |
124 | ||
125 | // XXX GLIBCXX_ABI Deprecated | |
126 | // gcc-4.5.0 | |
127 | // <atomic> signature changes | |
128 | ||
129 | // The rename syntax for default exported names is | |
130 | // asm (".symver name1,exportedname@GLIBCXX_3.4") | |
131 | // asm (".symver name2,exportedname@@GLIBCXX_3.4.5") | |
132 | // In the future, GLIBCXX_ABI > 6 should remove all uses of | |
133 | // _GLIBCXX_*_SYMVER macros in this file. | |
134 | ||
ac2e5c89 | 135 | #if defined(_GLIBCXX_SYMVER_GNU) && defined(PIC) \ |
c18dc5cc RO |
136 | && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \ |
137 | && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT) | |
ac2e5c89 | 138 | |
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139 | #define _GLIBCXX_ASM_SYMVER(cur, old, version) \ |
140 | asm (".symver " #cur "," #old "@@" #version); | |
141 | ||
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142 | _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag5clearESt12memory_order, _ZNVSt9__atomic011atomic_flag5clearESt12memory_order, GLIBCXX_3.4.11) |
143 | ||
144 | _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag12test_and_setESt12memory_order, _ZNVSt9__atomic011atomic_flag12test_and_setESt12memory_order, GLIBCXX_3.4.11) | |
ac2e5c89 | 145 | |
afd88205 | 146 | #endif |