| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2005-2009. Distributed under the Boost |
| // Software License, Version 1.0. (See accompanying file |
| // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| // See http://www.boost.org/libs/interprocess for documentation. |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Parts of the pthread code come from Boost Threads code: |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Copyright (C) 2001-2003 |
| // William E. Kempf |
| // |
| // Permission to use, copy, modify, distribute and sell this software |
| // and its documentation for any purpose is hereby granted without fee, |
| // provided that the above copyright notice appear in all copies and |
| // that both that copyright notice and this permission notice appear |
| // in supporting documentation. William E. Kempf makes no representations |
| // about the suitability of this software for any purpose. |
| // It is provided "as is" without express or implied warranty. |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef BOOST_INTERPROCESS_DETAIL_EMULATION_RECURSIVE_MUTEX_HPP |
| #define BOOST_INTERPROCESS_DETAIL_EMULATION_RECURSIVE_MUTEX_HPP |
| |
| #include <boost/interprocess/detail/posix_time_types_wrk.hpp> |
| #include <boost/interprocess/detail/os_thread_functions.hpp> |
| #include <boost/interprocess/exceptions.hpp> |
| #include <boost/interprocess/detail/atomic.hpp> |
| #include <boost/cstdint.hpp> |
| #include <boost/interprocess/detail/os_thread_functions.hpp> |
| #include <boost/interprocess/sync/emulation/mutex.hpp> |
| #include <boost/assert.hpp> |
| |
| namespace boost { |
| namespace interprocess { |
| namespace detail { |
| |
| class emulation_recursive_mutex |
| { |
| emulation_recursive_mutex(const emulation_recursive_mutex &); |
| emulation_recursive_mutex &operator=(const emulation_recursive_mutex &); |
| public: |
| |
| emulation_recursive_mutex(); |
| ~emulation_recursive_mutex(); |
| |
| void lock(); |
| bool try_lock(); |
| bool timed_lock(const boost::posix_time::ptime &abs_time); |
| void unlock(); |
| void take_ownership(); |
| private: |
| emulation_mutex m_mutex; |
| unsigned int m_nLockCount; |
| volatile detail::OS_systemwide_thread_id_t m_nOwner; |
| volatile boost::uint32_t m_s; |
| }; |
| |
| inline emulation_recursive_mutex::emulation_recursive_mutex() |
| : m_nLockCount(0), m_nOwner(detail::get_invalid_systemwide_thread_id()){} |
| |
| inline emulation_recursive_mutex::~emulation_recursive_mutex(){} |
| |
| inline void emulation_recursive_mutex::lock() |
| { |
| typedef detail::OS_systemwide_thread_id_t handle_t; |
| const handle_t thr_id(detail::get_current_systemwide_thread_id()); |
| handle_t old_id; |
| detail::systemwide_thread_id_copy(m_nOwner, old_id); |
| if(detail::equal_systemwide_thread_id(thr_id , old_id)){ |
| if((unsigned int)(m_nLockCount+1) == 0){ |
| //Overflow, throw an exception |
| throw interprocess_exception("boost::interprocess::emulation_recursive_mutex recursive lock overflow"); |
| } |
| ++m_nLockCount; |
| } |
| else{ |
| m_mutex.lock(); |
| detail::systemwide_thread_id_copy(thr_id, m_nOwner); |
| m_nLockCount = 1; |
| } |
| } |
| |
| inline bool emulation_recursive_mutex::try_lock() |
| { |
| typedef detail::OS_systemwide_thread_id_t handle_t; |
| handle_t thr_id(detail::get_current_systemwide_thread_id()); |
| handle_t old_id; |
| detail::systemwide_thread_id_copy(m_nOwner, old_id); |
| if(detail::equal_systemwide_thread_id(thr_id , old_id)) { // we own it |
| if((unsigned int)(m_nLockCount+1) == 0){ |
| //Overflow, throw an exception |
| throw interprocess_exception("boost::interprocess::emulation_recursive_mutex recursive lock overflow"); |
| } |
| ++m_nLockCount; |
| return true; |
| } |
| if(m_mutex.try_lock()){ |
| detail::systemwide_thread_id_copy(thr_id, m_nOwner); |
| m_nLockCount = 1; |
| return true; |
| } |
| return false; |
| } |
| |
| inline bool emulation_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time) |
| { |
| typedef detail::OS_systemwide_thread_id_t handle_t; |
| if(abs_time == boost::posix_time::pos_infin){ |
| this->lock(); |
| return true; |
| } |
| const handle_t thr_id(detail::get_current_systemwide_thread_id()); |
| handle_t old_id; |
| detail::systemwide_thread_id_copy(m_nOwner, old_id); |
| if(detail::equal_systemwide_thread_id(thr_id , old_id)) { // we own it |
| if((unsigned int)(m_nLockCount+1) == 0){ |
| //Overflow, throw an exception |
| throw interprocess_exception("boost::interprocess::emulation_recursive_mutex recursive lock overflow"); |
| } |
| ++m_nLockCount; |
| return true; |
| } |
| if(m_mutex.timed_lock(abs_time)){ |
| detail::systemwide_thread_id_copy(thr_id, m_nOwner); |
| m_nLockCount = 1; |
| return true; |
| } |
| return false; |
| } |
| |
| inline void emulation_recursive_mutex::unlock() |
| { |
| typedef detail::OS_systemwide_thread_id_t handle_t; |
| handle_t old_id; |
| detail::systemwide_thread_id_copy(m_nOwner, old_id); |
| const handle_t thr_id(detail::get_current_systemwide_thread_id()); |
| (void)old_id; |
| (void)thr_id; |
| BOOST_ASSERT(detail::equal_systemwide_thread_id(thr_id, old_id)); |
| --m_nLockCount; |
| if(!m_nLockCount){ |
| const handle_t new_id(detail::get_invalid_systemwide_thread_id()); |
| detail::systemwide_thread_id_copy(new_id, m_nOwner); |
| m_mutex.unlock(); |
| } |
| } |
| |
| inline void emulation_recursive_mutex::take_ownership() |
| { |
| typedef detail::OS_systemwide_thread_id_t handle_t; |
| this->m_nLockCount = 1; |
| const handle_t thr_id(detail::get_current_systemwide_thread_id()); |
| detail::systemwide_thread_id_copy |
| (thr_id, m_nOwner); |
| } |
| |
| } //namespace detail { |
| } //namespace interprocess { |
| } //namespace boost { |
| |
| #endif //BOOST_INTERPROCESS_DETAIL_EMULATION_RECURSIVE_MUTEX_HPP |