/usr/include/boost/asio/detail/posix_event.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// detail/posix_event.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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_ASIO_DETAIL_POSIX_EVENT_HPP
#define BOOST_ASIO_DETAIL_POSIX_EVENT_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if defined(BOOST_ASIO_HAS_PTHREADS)
#include <pthread.h>
#include <boost/asio/detail/assert.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
class posix_event
: private noncopyable
{
public:
// Constructor.
BOOST_ASIO_DECL posix_event();
// Destructor.
~posix_event()
{
::pthread_cond_destroy(&cond_);
}
// Signal the event.
template <typename Lock>
void signal(Lock& lock)
{
BOOST_ASIO_ASSERT(lock.locked());
(void)lock;
signalled_ = true;
::pthread_cond_signal(&cond_); // Ignore EINVAL.
}
// Signal the event and unlock the mutex.
template <typename Lock>
void signal_and_unlock(Lock& lock)
{
BOOST_ASIO_ASSERT(lock.locked());
signalled_ = true;
lock.unlock();
::pthread_cond_signal(&cond_); // Ignore EINVAL.
}
// Reset the event.
template <typename Lock>
void clear(Lock& lock)
{
BOOST_ASIO_ASSERT(lock.locked());
(void)lock;
signalled_ = false;
}
// Wait for the event to become signalled.
template <typename Lock>
void wait(Lock& lock)
{
BOOST_ASIO_ASSERT(lock.locked());
while (!signalled_)
::pthread_cond_wait(&cond_, &lock.mutex().mutex_); // Ignore EINVAL.
}
private:
::pthread_cond_t cond_;
bool signalled_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#if defined(BOOST_ASIO_HEADER_ONLY)
# include <boost/asio/detail/impl/posix_event.ipp>
#endif // defined(BOOST_ASIO_HEADER_ONLY)
#endif // defined(BOOST_ASIO_HAS_PTHREADS)
#endif // BOOST_ASIO_DETAIL_POSIX_EVENT_HPP
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