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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2012-2012. 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.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTERPROCESS_DETAIL_CONDITION_ANY_ALGORITHM_HPP
#define BOOST_INTERPROCESS_DETAIL_CONDITION_ANY_ALGORITHM_HPP
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/detail/locks.hpp>
#include <limits>
namespace boost {
namespace interprocess {
namespace ipcdetail {
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// Condition variable 'any' (able to use any type of external mutex)
//
// The code is based on Howard E. Hinnant's ISO C++ N2406 paper.
// Many thanks to Howard for his support and comments.
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Required interface for ConditionAnyMembers
// class ConditionAnyMembers
// {
// typedef implementation_defined mutex_type;
// typedef implementation_defined condvar_type;
//
// condvar &get_condvar()
// mutex_type &get_mutex()
// };
//
// Must be initialized as following
//
// get_condvar() [no threads blocked]
// get_mutex() [unlocked]
template<class ConditionAnyMembers>
class condition_any_algorithm
{
private:
condition_any_algorithm();
~condition_any_algorithm();
condition_any_algorithm(const condition_any_algorithm &);
condition_any_algorithm &operator=(const condition_any_algorithm &);
typedef typename ConditionAnyMembers::mutex_type mutex_type;
typedef typename ConditionAnyMembers::condvar_type condvar_type;
template <class Lock>
static void do_wait(ConditionAnyMembers &data, Lock& lock);
template <class Lock>
static bool do_timed_wait(ConditionAnyMembers &data, Lock& lock, const boost::posix_time::ptime &abs_time);
public:
template<class Lock>
static bool wait ( ConditionAnyMembers &data, Lock &mut
, bool timeout_enabled, const boost::posix_time::ptime &abs_time);
static void signal( ConditionAnyMembers &data, bool broadcast);
};
template<class ConditionAnyMembers>
void condition_any_algorithm<ConditionAnyMembers>::signal(ConditionAnyMembers &data, bool broadcast)
{
scoped_lock<mutex_type> internal_lock(data.get_mutex());
if(broadcast){
data.get_condvar().notify_all();
}
else{
data.get_condvar().notify_one();
}
}
template<class ConditionAnyMembers>
template<class Lock>
bool condition_any_algorithm<ConditionAnyMembers>::wait
( ConditionAnyMembers &data
, Lock &lock
, bool tout_enabled
, const boost::posix_time::ptime &abs_time)
{
if(tout_enabled){
return condition_any_algorithm::do_timed_wait(data, lock, abs_time);
}
else{
condition_any_algorithm::do_wait(data, lock);
return true;
}
}
template<class ConditionAnyMembers>
template <class Lock>
void condition_any_algorithm<ConditionAnyMembers>::do_wait
(ConditionAnyMembers &data, Lock& lock)
{
//lock internal before unlocking external to avoid race with a notifier
scoped_lock<mutex_type> internal_lock(data.get_mutex());
{
lock_inverter<Lock> inverted_lock(lock);
scoped_lock<lock_inverter<Lock> > external_unlock(inverted_lock);
{ //unlock internal first to avoid deadlock with near simultaneous waits
scoped_lock<mutex_type> internal_unlock;
internal_lock.swap(internal_unlock);
data.get_condvar().wait(internal_unlock);
}
}
}
template<class ConditionAnyMembers>
template <class Lock>
bool condition_any_algorithm<ConditionAnyMembers>::do_timed_wait
(ConditionAnyMembers &data, Lock& lock, const boost::posix_time::ptime &abs_time)
{
//lock internal before unlocking external to avoid race with a notifier
scoped_lock<mutex_type> internal_lock(data.get_mutex());
{
//Unlock external lock and program for relock
lock_inverter<Lock> inverted_lock(lock);
scoped_lock<lock_inverter<Lock> > external_unlock(inverted_lock);
{ //unlock internal first to avoid deadlock with near simultaneous waits
scoped_lock<mutex_type> internal_unlock;
internal_lock.swap(internal_unlock);
return data.get_condvar().timed_wait(internal_unlock, abs_time);
}
}
}
template<class ConditionAnyMembers>
class condition_any_wrapper
{
//Non-copyable
condition_any_wrapper(const condition_any_wrapper &);
condition_any_wrapper &operator=(const condition_any_wrapper &);
ConditionAnyMembers m_data;
typedef ipcdetail::condition_any_algorithm<ConditionAnyMembers> algo_type;
public:
condition_any_wrapper(){}
~condition_any_wrapper(){}
ConditionAnyMembers & get_members()
{ return m_data; }
const ConditionAnyMembers & get_members() const
{ return m_data; }
void notify_one()
{ algo_type::signal(m_data, false); }
void notify_all()
{ algo_type::signal(m_data, true); }
template <typename L>
void wait(L& lock)
{
if (!lock)
throw lock_exception();
algo_type::wait(m_data, lock, false, boost::posix_time::ptime());
}
template <typename L, typename Pr>
void wait(L& lock, Pr pred)
{
if (!lock)
throw lock_exception();
while (!pred())
algo_type::wait(m_data, lock, false, boost::posix_time::ptime());
}
template <typename L>
bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time)
{
if (!lock)
throw lock_exception();
return algo_type::wait(m_data, lock, true, abs_time);
}
template <typename L, typename Pr>
bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time, Pr pred)
{
if (!lock)
throw lock_exception();
while (!pred()){
if (!algo_type::wait(m_data, lock, true, abs_time))
return pred();
}
return true;
}
};
} //namespace ipcdetail
} //namespace interprocess
} //namespace boost
#include <boost/interprocess/detail/config_end.hpp>
#endif //BOOST_INTERPROCESS_DETAIL_CONDITION_ANY_ALGORITHM_HPP
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