/Src/Dependencies/Boost/boost/interprocess/sync/interprocess_condition.hpp
http://hadesmem.googlecode.com/ · C++ Header · 179 lines · 107 code · 31 blank · 41 comment · 13 complexity · ce8a7dd9760f21e8ecd1e291838adce9 MD5 · raw file
- //////////////////////////////////////////////////////////////////////////////
- //
- // (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.
- //
- //////////////////////////////////////////////////////////////////////////////
- #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/scoped_lock.hpp>
- #include <boost/interprocess/sync/interprocess_condition.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 <pthread.h>
- #include <errno.h>
- #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
- #define BOOST_INTERPROCESS_USE_POSIX
- #else
- #include <boost/interprocess/detail/atomic.hpp>
- #include <boost/cstdint.hpp>
- #include <boost/interprocess/detail/os_thread_functions.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();
- //!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();
- //!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();
- 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())
- 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 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 (!do_timed_wait(abs_time, *lock.mutex()))
- return pred();
- }
- return true;
- }
- /// @cond
- private:
- void do_wait(interprocess_mutex &mut);
- bool do_timed_wait(const boost::posix_time::ptime &abs_time, interprocess_mutex &mut);
- #if defined (BOOST_INTERPROCESS_USE_GENERIC_EMULATION)
- enum { SLEEP = 0, NOTIFY_ONE, NOTIFY_ALL };
- interprocess_mutex m_enter_mut;
- //interprocess_mutex m_check_mut;
- volatile boost::uint32_t m_command;
- volatile boost::uint32_t m_num_waiters;
- bool do_timed_wait(bool tout_enabled, const boost::posix_time::ptime &abs_time, interprocess_mutex &mut);
- void notify(boost::uint32_t command);
- #elif defined(BOOST_INTERPROCESS_USE_POSIX)
- pthread_cond_t m_condition;
- #endif
- /// @endcond
- };
- } //namespace interprocess
- } // namespace boost
- #ifdef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
- # undef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
- # include <boost/interprocess/sync/emulation/interprocess_condition.hpp>
- #endif
- #ifdef BOOST_INTERPROCESS_USE_POSIX
- # undef BOOST_INTERPROCESS_USE_POSIX
- # include <boost/interprocess/sync/posix/interprocess_condition.hpp>
- #endif
- #include <boost/interprocess/detail/config_end.hpp>
- #endif // BOOST_INTERPROCESS_CONDITION_HPP