| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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 |