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d361e123c6
c27aa31f0 Updated Boost to v1.70.0 including iterator range math numeric crc circular_buffer multi_index intrusive git-subtree-dir: boost git-subtree-split: c27aa31f06ebf1a91b3fa3ae9df9b5efdf14ec9f
125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2012-2013. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_SYNC_DETAIL_COMMON_ALGORITHMS_HPP
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#define BOOST_INTERPROCESS_SYNC_DETAIL_COMMON_ALGORITHMS_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/sync/spin/wait.hpp>
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namespace boost {
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namespace interprocess {
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namespace ipcdetail {
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template<class MutexType>
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bool try_based_timed_lock(MutexType &m, const boost::posix_time::ptime &abs_time)
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{
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//Same as lock()
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if(abs_time == boost::posix_time::pos_infin){
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m.lock();
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return true;
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}
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//Always try to lock to achieve POSIX guarantees:
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// "Under no circumstance shall the function fail with a timeout if the mutex
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// can be locked immediately. The validity of the abs_timeout parameter need not
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// be checked if the mutex can be locked immediately."
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else if(m.try_lock()){
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return true;
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}
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else{
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spin_wait swait;
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while(microsec_clock::universal_time() < abs_time){
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if(m.try_lock()){
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return true;
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}
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swait.yield();
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}
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return false;
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}
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}
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template<class MutexType>
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void try_based_lock(MutexType &m)
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{
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if(!m.try_lock()){
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spin_wait swait;
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do{
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if(m.try_lock()){
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break;
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}
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else{
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swait.yield();
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}
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}
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while(1);
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}
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}
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template<class MutexType>
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void timed_based_lock(MutexType &m, unsigned const uCheckPeriodSec)
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{
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const boost::posix_time::time_duration dur(0, 0, uCheckPeriodSec);
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boost::posix_time::ptime deadline(microsec_clock::universal_time()+dur);
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if(!m.timed_lock(deadline)){
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spin_wait swait;
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do{
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deadline = microsec_clock::universal_time()+dur;
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if(m.timed_lock(deadline)){
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break;
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}
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else{
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swait.yield();
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}
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}
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while(1);
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}
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}
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template<class MutexType>
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void timed_based_timed_lock(MutexType &m, const boost::posix_time::ptime &abs_time, unsigned const uCheckPeriodSec)
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{
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const boost::posix_time::time_duration dur(0, 0, uCheckPeriodSec);
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boost::posix_time::ptime deadline(microsec_clock::universal_time()+dur);
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if(abs_time <= deadline){
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m.timed_lock(abs_time);
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}
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else if(!m.timed_lock(deadline)){
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spin_wait swait;
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do{
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deadline = microsec_clock::universal_time()+dur;
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if(m.timed_lock(deadline)){
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break;
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}
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else{
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swait.yield();
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}
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}
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while(1);
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}
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}
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} //namespace ipcdetail
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} //namespace interprocess
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} //namespace boost
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#include <boost/interprocess/detail/config_end.hpp>
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#endif //BOOST_INTERPROCESS_SYNC_DETAIL_COMMON_ALGORITHMS_HPP
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