//////////////////////////////////////////////////////////////////////////////
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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.is_pos_infinity()){
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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 timeout_when_locking_aware_lock(MutexType &m)
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{
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#ifdef BOOST_INTERPROCESS_ENABLE_TIMEOUT_WHEN_LOCKING
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boost::posix_time::ptime wait_time
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= microsec_clock::universal_time()
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+ boost::posix_time::milliseconds(BOOST_INTERPROCESS_TIMEOUT_WHEN_LOCKING_DURATION_MS);
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if (!m.timed_lock(wait_time))
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{
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throw interprocess_exception(timeout_when_locking_error
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, "Interprocess mutex timeout when locking. Possible deadlock: "
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"owner died without unlocking?");
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}
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#else
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m.lock();
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#endif
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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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