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115 lines
4.0 KiB
115 lines
4.0 KiB
////////////////////////////////////////////////////////////////////////////// |
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// |
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// (C) Copyright Ion Gaztanaga 2005-2009. 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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// barrier is a modified version of Boost Threads barrier |
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// |
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////////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (C) 2002-2003 |
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// David Moore, 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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#ifndef BOOST_INTERPROCESS_BARRIER_HPP |
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#define BOOST_INTERPROCESS_BARRIER_HPP |
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/// @cond |
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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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#if defined BOOST_INTERPROCESS_POSIX_PROCESS_SHARED && defined BOOST_INTERPROCESS_POSIX_BARRIERS |
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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/sync/interprocess_mutex.hpp> |
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# include <boost/interprocess/sync/scoped_lock.hpp> |
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# include <boost/interprocess/sync/interprocess_condition.hpp> |
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# include <stdexcept> |
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# define BOOST_INTERPROCESS_USE_GENERIC_EMULATION |
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#endif |
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# include <boost/interprocess/exceptions.hpp> |
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/// @endcond |
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namespace boost { |
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namespace interprocess { |
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//!An object of class barrier is a synchronization primitive that |
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//!can be placed in shared memory used to cause a set of threads from |
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//!different processes to wait until they each perform a certain |
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//!function or each reach a particular point in their execution. |
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class barrier |
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{ |
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public: |
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//!Constructs a barrier object that will cause count threads |
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//!to block on a call to wait(). |
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barrier(unsigned int count); |
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//!Destroys *this. If threads are still executing their wait() |
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//!operations, the behavior for these threads is undefined. |
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~barrier(); |
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//!Effects: Wait until N threads call wait(), where N equals the count |
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//!provided to the constructor for the barrier object. |
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//!Note that if the barrier is destroyed before wait() can return, |
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//!the behavior is undefined. |
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//!Returns: Exactly one of the N threads will receive a return value |
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//!of true, the others will receive a value of false. Precisely which |
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//!thread receives the return value of true will be implementation-defined. |
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//!Applications can use this value to designate one thread as a leader that |
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//!will take a certain action, and the other threads emerging from the barrier |
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//!can wait for that action to take place. |
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bool wait(); |
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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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interprocess_mutex m_mutex; |
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interprocess_condition m_cond; |
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unsigned int m_threshold; |
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unsigned int m_count; |
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unsigned int m_generation; |
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#else //#if defined BOOST_INTERPROCESS_USE_POSIX |
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pthread_barrier_t m_barrier; |
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#endif//#if defined BOOST_INTERPROCESS_USE_POSIX |
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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_barrier.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_barrier.hpp> |
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#endif |
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#include <boost/interprocess/detail/config_end.hpp> |
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#endif
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