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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2011. 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_CONDITION_HPP
#define BOOST_INTERPROCESS_CONDITION_HPP
#if (defined _MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
/// @cond
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
#include <boost/interprocess/sync/interprocess_mutex.hpp>
#include <boost/interprocess/exceptions.hpp>
#include <boost/limits.hpp>
#include <boost/assert.hpp>
#if !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION) && defined(BOOST_INTERPROCESS_POSIX_PROCESS_SHARED)
#include <boost/interprocess/sync/posix/condition.hpp>
#define BOOST_INTERPROCESS_USE_POSIX
//Experimental...
//#elif !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION) && defined (BOOST_INTERPROCESS_WINDOWS)
// #include <boost/interprocess/sync/windows/condition.hpp>
// #define BOOST_INTERPROCESS_USE_WINDOWS
#elif !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
#include <boost/interprocess/sync/spin/condition.hpp>
#define BOOST_INTERPROCESS_USE_GENERIC_EMULATION
#endif
/// @endcond
//!\file
//!Describes process-shared variables interprocess_condition class
namespace boost {
namespace posix_time
{ class ptime; }
namespace interprocess {
class named_condition;
//!This class is a condition variable that can be placed in shared memory or
//!memory mapped files.
class interprocess_condition
{
/// @cond
//Non-copyable
interprocess_condition(const interprocess_condition &);
interprocess_condition &operator=(const interprocess_condition &);
friend class named_condition;
/// @endcond
public:
//!Constructs a interprocess_condition. On error throws interprocess_exception.
interprocess_condition(){}
//!Destroys *this
//!liberating system resources.
~interprocess_condition(){}
//!If there is a thread waiting on *this, change that
//!thread's state to ready. Otherwise there is no effect.
void notify_one()
{ m_condition.notify_one(); }
//!Change the state of all threads waiting on *this to ready.
//!If there are no waiting threads, notify_all() has no effect.
void notify_all()
{ m_condition.notify_all(); }
//!Releases the lock on the interprocess_mutex object associated with lock, blocks
//!the current thread of execution until readied by a call to
//!this->notify_one() or this->notify_all(), and then reacquires the lock.
template <typename L>
void wait(L& lock)
{
if (!lock)
throw lock_exception();
this->do_wait(*lock.mutex());
}
//!The same as:
//!while (!pred()) wait(lock)
template <typename L, typename Pr>
void wait(L& lock, Pr pred)
{
if (!lock)
throw lock_exception();
while (!pred())
this->do_wait(*lock.mutex());
}
//!Releases the lock on the interprocess_mutex object associated with lock, blocks
//!the current thread of execution until readied by a call to
//!this->notify_one() or this->notify_all(), or until time abs_time is reached,
//!and then reacquires the lock.
//!Returns: false if time abs_time is reached, otherwise true.
template <typename L>
bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time)
{
if(abs_time == boost::posix_time::pos_infin){
this->wait(lock);
return true;
}
if (!lock)
throw lock_exception();
return this->do_timed_wait(abs_time, *lock.mutex());
}
//!The same as: while (!pred()) {
//! if (!timed_wait(lock, abs_time)) return pred();
//! } return true;
template <typename L, typename Pr>
bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time, Pr pred)
{
if(abs_time == boost::posix_time::pos_infin){
this->wait(lock, pred);
return true;
}
if (!lock)
throw lock_exception();
while (!pred()){
if (!this->do_timed_wait(abs_time, *lock.mutex()))
return pred();
}
return true;
}
/// @cond
void do_wait(interprocess_mutex &mut)
{ m_condition.do_wait(mut.mutex); }
bool do_timed_wait(const boost::posix_time::ptime &abs_time, interprocess_mutex &mut)
{ return m_condition.do_timed_wait(abs_time, mut.mutex); }
private:
#if defined (BOOST_INTERPROCESS_USE_GENERIC_EMULATION)
#undef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
ipcdetail::spin_condition m_condition;
#elif defined(BOOST_INTERPROCESS_USE_POSIX)
#undef BOOST_INTERPROCESS_USE_POSIX
ipcdetail::posix_condition m_condition;
#elif defined(BOOST_INTERPROCESS_USE_WINDOWS)
#undef BOOST_INTERPROCESS_USE_WINDOWS
ipcdetail::windows_condition m_condition;
#else
#error "Unknown platform for interprocess_mutex"
#endif
/// @endcond
};
} //namespace interprocess
} // namespace boost
#include <boost/interprocess/detail/config_end.hpp>
#endif // BOOST_INTERPROCESS_CONDITION_HPP
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