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63 lines
1.2 KiB
C++
63 lines
1.2 KiB
C++
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// Copyright Oliver Kowalke 2013.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include "boost/fiber/barrier.hpp"
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#include <boost/exception/all.hpp>
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#include <boost/thread/locks.hpp>
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#include "boost/fiber/exceptions.hpp"
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#include "boost/fiber/operations.hpp"
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace fibers {
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barrier::barrier( std::size_t initial) :
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initial_( initial),
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current_( initial_),
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cycle_( true),
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mtx_(),
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cond_()
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{
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if ( 0 == initial)
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boost::throw_exception(
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invalid_argument(
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system::errc::invalid_argument,
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"boost fiber: zero initial barrier count") );
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}
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bool
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barrier::wait()
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{
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boost::unique_lock< mutex > lk( mtx_);
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bool cycle( cycle_);
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if ( 0 == --current_)
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{
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cycle_ = ! cycle_;
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current_ = initial_;
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cond_.notify_all();
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return true;
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}
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else
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{
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while ( cycle == cycle_)
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//FIXME: what happend if fiber is interrupted?
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// ++current_ ?
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cond_.wait( lk);
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}
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return false;
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}
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}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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