/Src/Dependencies/Boost/boost/interprocess/sync/emulation/recursive_mutex.hpp
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- //////////////////////////////////////////////////////////////////////////////
- //
- // (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