3 // Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
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
8 // Free Software Foundation; either version 3, or (at your option)
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.
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.
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/>.
27 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
28 #ifndef _GLIBCXX_HAVE_TLS
31 inline std::unique_lock<std::mutex>*&
32 __get_once_functor_lock_ptr()
34 static std::unique_lock<std::mutex>* __once_functor_lock_ptr = 0;
35 return __once_functor_lock_ptr;
40 namespace std _GLIBCXX_VISIBILITY(default)
42 _GLIBCXX_BEGIN_NAMESPACE_VERSION
44 #ifdef _GLIBCXX_HAVE_TLS
45 __thread void* __once_callable;
46 __thread void (*__once_call)();
48 // Explicit instantiation due to -fno-implicit-instantiation.
49 template class function<void()>;
50 function<void()> __once_functor;
55 static mutex once_mutex;
59 // code linked against ABI 3.4.12 and later uses this
61 __set_once_functor_lock_ptr(unique_lock<mutex>* __ptr)
63 __get_once_functor_lock_ptr() = __ptr;
66 // unsafe - retained for compatibility with ABI 3.4.11
68 __get_once_functor_lock()
70 static unique_lock<mutex> once_functor_lock(__get_once_mutex(), defer_lock);
71 return once_functor_lock;
79 #ifndef _GLIBCXX_HAVE_TLS
80 function<void()> __once_call = std::move(__once_functor);
81 if (unique_lock<mutex>* __lock = __get_once_functor_lock_ptr())
83 // caller is using new ABI and provided lock ptr
84 __get_once_functor_lock_ptr() = 0;
88 __get_once_functor_lock().unlock(); // global lock
94 _GLIBCXX_END_NAMESPACE_VERSION
97 // XXX GLIBCXX_ABI Deprecated
99 // <mutex> export changes
100 #if defined(_GLIBCXX_SYMVER_GNU) && defined(PIC) \
101 && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \
102 && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)
104 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
106 std::defer_lock_t defer_lock;
107 std::try_to_lock_t try_to_lock;
108 std::adopt_lock_t adopt_lock;
111 #define _GLIBCXX_ASM_SYMVER(cur, old, version) \
112 asm (".symver " #cur "," #old "@@" #version);
114 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10adopt_lockE, _ZSt10adopt_lock, GLIBCXX_3.4.11)
115 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10defer_lockE, _ZSt10defer_lock, GLIBCXX_3.4.11)
116 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx11try_to_lockE, _ZSt11try_to_lock, GLIBCXX_3.4.11)
121 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1