134 lines
4.9 KiB
C++
Executable File
134 lines
4.9 KiB
C++
Executable File
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2008. 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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//
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// Parts of the pthread code come from Boost Threads code.
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2003
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// William E. Kempf
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appear in all copies and
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// that both that copyright notice and this permission notice appear
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// in supporting documentation. William E. Kempf makes no representations
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// about the suitability of this software for any purpose.
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// It is provided "as is" without express or implied warranty.
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_MUTEX_HPP
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#define BOOST_INTERPROCESS_MUTEX_HPP
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#if (defined _MSC_VER) && (_MSC_VER >= 1200)
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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/detail/posix_time_types_wrk.hpp>
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#include <cassert>
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#if defined BOOST_INTERPROCESS_POSIX_PROCESS_SHARED
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#include <pthread.h>
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#include <errno.h>
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#include <boost/interprocess/sync/posix/pthread_helpers.hpp>
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#define BOOST_INTERPROCESS_USE_POSIX
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#else
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#include <boost/interprocess/detail/atomic.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/interprocess/detail/os_thread_functions.hpp>
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#define BOOST_INTERPROCESS_USE_GENERIC_EMULATION
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#endif
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//!\file
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//!Describes a mutex class that can be placed in memory shared by
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//!several processes.
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namespace boost {
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namespace interprocess {
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class interprocess_condition;
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//!Wraps a interprocess_mutex that can be placed in shared memory and can be
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//!shared between processes. Allows timed lock tries
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class interprocess_mutex
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{
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/// @cond
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//Non-copyable
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interprocess_mutex(const interprocess_mutex &);
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interprocess_mutex &operator=(const interprocess_mutex &);
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friend class interprocess_condition;
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/// @endcond
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public:
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//!Constructor.
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//!Throws interprocess_exception on error.
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interprocess_mutex();
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//!Destructor. If any process uses the mutex after the destructor is called
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//!the result is undefined. Does not throw.
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~interprocess_mutex();
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//!Effects: The calling thread tries to obtain ownership of the mutex, and
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//! if another thread has ownership of the mutex, it waits until it can
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//! obtain the ownership. If a thread takes ownership of the mutex the
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//! mutex must be unlocked by the same mutex.
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//!Throws: interprocess_exception on error.
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void lock();
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//!Effects: The calling thread tries to obtain ownership of the mutex, and
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//! if another thread has ownership of the mutex returns immediately.
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//!Returns: If the thread acquires ownership of the mutex, returns true, if
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//! the another thread has ownership of the mutex, returns false.
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//!Throws: interprocess_exception on error.
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bool try_lock();
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//!Effects: The calling thread will try to obtain exclusive ownership of the
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//! mutex if it can do so in until the specified time is reached. If the
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//! mutex supports recursive locking, the mutex must be unlocked the same
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//! number of times it is locked.
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//!Returns: If the thread acquires ownership of the mutex, returns true, if
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//! the timeout expires returns false.
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//!Throws: interprocess_exception on error.
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bool timed_lock(const boost::posix_time::ptime &abs_time);
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//!Effects: The calling thread releases the exclusive ownership of the mutex.
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//!Throws: interprocess_exception on error.
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void unlock();
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/// @cond
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private:
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#if defined(BOOST_INTERPROCESS_USE_GENERIC_EMULATION)
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volatile boost::uint32_t m_s;
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#elif defined(BOOST_INTERPROCESS_USE_POSIX)
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pthread_mutex_t m_mut;
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#endif //#if (defined BOOST_WINDOWS) && !(defined BOOST_DISABLE_WIN32)
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/// @endcond
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};
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} //namespace interprocess {
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} //namespace boost {
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#ifdef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
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# undef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
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# include <boost/interprocess/sync/emulation/interprocess_mutex.hpp>
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#endif
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#ifdef BOOST_INTERPROCESS_USE_POSIX
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# undef BOOST_INTERPROCESS_USE_POSIX
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# include <boost/interprocess/sync/posix/interprocess_mutex.hpp>
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#endif
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#include <boost/interprocess/detail/config_end.hpp>
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#endif //BOOST_INTERPROCESS_MUTEX_HPP
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