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" lamJq@@ţ h auto *lY> C]m@Eqţ u_I|+// Support for concurrent programing -*- C++ -*- // Copyright (C) 2003-2013 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // . /** @file ext/concurrence.h * This file is a GNU extension to the Standard C++ Library. */ #ifndef _CONCURRENCE_H #define _CONCURRENCE_H 1 #pragma GCC system_header #include #include #include #include #include namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // Available locking policies: // _S_single single-threaded code that doesn't need to be locked. // _S_mutex multi-threaded code that requires additional support // from gthr.h or abstraction layers in concurrence.h. // _S_atomic multi-threaded code using atomic operations. enum _Lock_policy { _S_single, _S_mutex, _S_atomic }; // Compile time constant that indicates prefered locking policy in // the current configuration. static const _Lock_policy __default_lock_policy = #ifdef __GTHREADS #if (defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2) \ && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) _S_atomic; #else _S_mutex; #endif #else _S_single; #endif // NB: As this is used in libsupc++, need to only depend on // exception. No stdexception classes, no use of std::string. class __concurrence_lock_error : public std::exception { public: virtual char const* what() const throw() { return "__gnu_cxx::__concurrence_lock_error"; } }; class __concurrence_unlock_error : public std::exception { public: virtual char const* what() const throw() { return "__gnu_cxx::__concurrence_unlock_error"; } }; class __concurrence_broadcast_error : public std::exception { public: virtual char const* what() const throw() { return "__gnu_cxx::__concurrence_broadcast_error"; } }; class __concurrence_wait_error : public std::exception { public: virtual char const* what() const throw() { return "__gnu_cxx::__concurrence_wait_error"; } }; // Substitute for concurrence_error object in the case of -fno-exceptions. inline void __throw_concurrence_lock_error() { _GLIBCXX_THROW_OR_ABORT(__concurrence_lock_error()); } inline void __throw_concurrence_unlock_error() { _GLIBCXX_THROW_OR_ABORT(__concurrence_unlock_error()); } #ifdef __GTHREAD_HAS_COND inline void __throw_concurrence_broadcast_error() { _GLIBCXX_THROW_OR_ABORT(__c