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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 | ||
53dc5044 PC |
52 | _GLIBCXX_BEGIN_NAMESPACE(std) |
53 | ||
50ce8d3d | 54 | namespace __atomic0 |
d466a7e2 | 55 | { |
50ce8d3d | 56 | bool |
afd88205 | 57 | atomic_flag::test_and_set(memory_order) |
50ce8d3d | 58 | { |
b0c2c850 | 59 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
99827523 | 60 | lock_guard<mutex> __lock(get_atomic_mutex()); |
d466a7e2 | 61 | #endif |
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62 | bool result = _M_i; |
63 | _M_i = true; | |
64 | return result; | |
65 | } | |
d466a7e2 | 66 | |
50ce8d3d | 67 | void |
afd88205 | 68 | atomic_flag::clear(memory_order) |
50ce8d3d | 69 | { |
b0c2c850 | 70 | #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
99827523 | 71 | lock_guard<mutex> __lock(get_atomic_mutex()); |
d466a7e2 | 72 | #endif |
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73 | _M_i = false; |
74 | } | |
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75 | |
76 | _GLIBCXX_BEGIN_EXTERN_C | |
77 | ||
78 | bool | |
79 | atomic_flag_test_and_set_explicit(__atomic_flag_base* __a, | |
80 | memory_order __m) _GLIBCXX_NOTHROW | |
81 | { | |
82 | atomic_flag* d = static_cast<atomic_flag*>(__a); | |
83 | return d->test_and_set(__m); | |
50ce8d3d | 84 | } |
d466a7e2 | 85 | |
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86 | void |
87 | atomic_flag_clear_explicit(__atomic_flag_base* __a, | |
88 | memory_order __m) _GLIBCXX_NOTHROW | |
d466a7e2 | 89 | { |
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90 | atomic_flag* d = static_cast<atomic_flag*>(__a); |
91 | return d->clear(__m); | |
92 | } | |
d466a7e2 | 93 | |
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94 | void |
95 | __atomic_flag_wait_explicit(__atomic_flag_base* __a, | |
96 | memory_order __x) _GLIBCXX_NOTHROW | |
97 | { | |
98 | while (atomic_flag_test_and_set_explicit(__a, __x)) | |
99 | { }; | |
100 | } | |
d466a7e2 | 101 | |
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102 | _GLIBCXX_CONST __atomic_flag_base* |
103 | __atomic_flag_for_address(const volatile void* __z) _GLIBCXX_NOTHROW | |
104 | { | |
105 | uintptr_t __u = reinterpret_cast<uintptr_t>(__z); | |
106 | __u += (__u >> 2) + (__u << 4); | |
107 | __u += (__u >> 7) + (__u << 5); | |
108 | __u += (__u >> 17) + (__u << 13); | |
109 | if (sizeof(uintptr_t) > 4) | |
110 | __u += (__u >> 31); | |
111 | __u &= ~((~uintptr_t(0)) << LOGSIZE); | |
112 | return flag_table + __u; | |
113 | } | |
d466a7e2 | 114 | |
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115 | _GLIBCXX_END_EXTERN_C |
116 | ||
117 | } // namespace __atomic0 | |
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118 | |
119 | _GLIBCXX_END_NAMESPACE | |
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120 | |
121 | ||
122 | // XXX GLIBCXX_ABI Deprecated | |
123 | // gcc-4.5.0 | |
124 | // <atomic> signature changes | |
125 | ||
126 | // The rename syntax for default exported names is | |
127 | // asm (".symver name1,exportedname@GLIBCXX_3.4") | |
128 | // asm (".symver name2,exportedname@@GLIBCXX_3.4.5") | |
129 | // In the future, GLIBCXX_ABI > 6 should remove all uses of | |
130 | // _GLIBCXX_*_SYMVER macros in this file. | |
131 | ||
ac2e5c89 | 132 | #if defined(_GLIBCXX_SYMVER_GNU) && defined(PIC) \ |
c18dc5cc RO |
133 | && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \ |
134 | && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT) | |
ac2e5c89 | 135 | |
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136 | #define _GLIBCXX_ASM_SYMVER(cur, old, version) \ |
137 | asm (".symver " #cur "," #old "@@" #version); | |
138 | ||
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139 | _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag5clearESt12memory_order, _ZNVSt9__atomic011atomic_flag5clearESt12memory_order, GLIBCXX_3.4.11) |
140 | ||
141 | _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag12test_and_setESt12memory_order, _ZNVSt9__atomic011atomic_flag12test_and_setESt12memory_order, GLIBCXX_3.4.11) | |
ac2e5c89 | 142 | |
afd88205 | 143 | #endif |