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File indexing completed on 2025-01-30 09:59:55
0001 //---------------------------------------------------------------------------- 0002 /// @file spinlock_t.hpp 0003 /// @brief 0004 /// 0005 /// @author Copyright (c) 2010 2015 Francisco José Tapia (fjtapia@gmail.com )\n 0006 /// Distributed under the Boost Software License, Version 1.0.\n 0007 /// ( See accompanyingfile LICENSE_1_0.txt or copy at 0008 /// http://www.boost.org/LICENSE_1_0.txt ) 0009 /// @version 0.1 0010 /// 0011 /// @remarks 0012 //----------------------------------------------------------------------------- 0013 #ifndef __BOOST_SORT_PARALLEL_DETAIL_UTIL_SPINLOCK_HPP 0014 #define __BOOST_SORT_PARALLEL_DETAIL_UTIL_SPINLOCK_HPP 0015 0016 #include <ciso646> 0017 #include <atomic> 0018 #include <ctime> 0019 #include <functional> 0020 #include <memory> 0021 #include <mutex> 0022 #include <thread> 0023 0024 namespace boost 0025 { 0026 namespace sort 0027 { 0028 namespace common 0029 { 0030 // 0031 //--------------------------------------------------------------------------- 0032 /// @class spinlock_t 0033 /// @brief This class implement, from atomic variables, a spinlock 0034 /// @remarks This class meet the BasicLockable requirements ( lock, unlock ) 0035 //--------------------------------------------------------------------------- 0036 class spinlock_t 0037 { 0038 private: 0039 //------------------------------------------------------------------------ 0040 // P R I V A T E V A R I A B L E S 0041 //------------------------------------------------------------------------ 0042 std::atomic_flag af; 0043 0044 public: 0045 // 0046 //------------------------------------------------------------------------- 0047 // function : spinlock_t 0048 /// @brief class constructor 0049 /// @param [in] 0050 //------------------------------------------------------------------------- 0051 explicit spinlock_t ( ) noexcept { af.clear ( ); }; 0052 // 0053 //------------------------------------------------------------------------- 0054 // function : lock 0055 /// @brief Lock the spinlock_t 0056 //------------------------------------------------------------------------- 0057 void lock ( ) noexcept 0058 { 0059 while (af.test_and_set (std::memory_order_acquire)) 0060 { 0061 std::this_thread::yield ( ); 0062 }; 0063 }; 0064 // 0065 //------------------------------------------------------------------------- 0066 // function : try_lock 0067 /// @brief Try to lock the spinlock_t, if not, return false 0068 /// @return true : locked 0069 /// false: not previous locked 0070 //------------------------------------------------------------------------- 0071 bool try_lock ( ) noexcept 0072 { 0073 return !af.test_and_set (std::memory_order_acquire); 0074 }; 0075 // 0076 //------------------------------------------------------------------------- 0077 // function : unlock 0078 /// @brief unlock the spinlock_t 0079 //------------------------------------------------------------------------- 0080 void unlock ( ) noexcept { af.clear (std::memory_order_release); }; 0081 0082 }; // E N D C L A S S S P I N L O C K 0083 // 0084 //*************************************************************************** 0085 }; // end namespace common 0086 }; // end namespace sort 0087 }; // end namespace boost 0088 //*************************************************************************** 0089 #endif
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