/usr/include/boost/thread/barrier.hpp is in libboost1.54-dev 1.54.0-4ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | // Copyright (C) 2002-2003
// David Moore, William E. Kempf
// Copyright (C) 2007-8 Anthony Williams
//
// 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)
#ifndef BOOST_BARRIER_JDM030602_HPP
#define BOOST_BARRIER_JDM030602_HPP
#include <boost/thread/detail/config.hpp>
#include <boost/thread/detail/delete.hpp>
#include <boost/throw_exception.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/lock_types.hpp>
#include <boost/thread/condition_variable.hpp>
#include <string>
#include <stdexcept>
#include <boost/config/abi_prefix.hpp>
namespace boost
{
class barrier
{
public:
BOOST_THREAD_NO_COPYABLE( barrier )
barrier(unsigned int count)
: m_threshold(count), m_count(count), m_generation(0)
{
if (count == 0)
boost::throw_exception(thread_exception(system::errc::invalid_argument, "barrier constructor: count cannot be zero."));
}
bool wait()
{
boost::unique_lock<boost::mutex> lock(m_mutex);
unsigned int gen = m_generation;
if (--m_count == 0)
{
m_generation++;
m_count = m_threshold;
m_cond.notify_all();
return true;
}
while (gen == m_generation)
m_cond.wait(lock);
return false;
}
private:
mutex m_mutex;
condition_variable m_cond;
unsigned int m_threshold;
unsigned int m_count;
unsigned int m_generation;
};
} // namespace boost
#include <boost/config/abi_suffix.hpp>
#endif
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