/usr/include/asio/detail/posix_thread.hpp is in libasio-dev 1.4.1-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// posix_thread.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 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 ASIO_DETAIL_POSIX_THREAD_HPP
#define ASIO_DETAIL_POSIX_THREAD_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <boost/config.hpp>
#include "asio/detail/pop_options.hpp"
#if defined(BOOST_HAS_PTHREADS)
#include "asio/detail/push_options.hpp"
#include <memory>
#include <boost/throw_exception.hpp>
#include <pthread.h>
#include "asio/detail/pop_options.hpp"
#include "asio/error.hpp"
#include "asio/system_error.hpp"
#include "asio/detail/noncopyable.hpp"
namespace asio {
namespace detail {
extern "C" void* asio_detail_posix_thread_function(void* arg);
class posix_thread
: private noncopyable
{
public:
// Constructor.
template <typename Function>
posix_thread(Function f)
: joined_(false)
{
std::auto_ptr<func_base> arg(new func<Function>(f));
int error = ::pthread_create(&thread_, 0,
asio_detail_posix_thread_function, arg.get());
if (error != 0)
{
asio::system_error e(
asio::error_code(error,
asio::error::get_system_category()),
"thread");
boost::throw_exception(e);
}
arg.release();
}
// Destructor.
~posix_thread()
{
if (!joined_)
::pthread_detach(thread_);
}
// Wait for the thread to exit.
void join()
{
if (!joined_)
{
::pthread_join(thread_, 0);
joined_ = true;
}
}
private:
friend void* asio_detail_posix_thread_function(void* arg);
class func_base
{
public:
virtual ~func_base() {}
virtual void run() = 0;
};
template <typename Function>
class func
: public func_base
{
public:
func(Function f)
: f_(f)
{
}
virtual void run()
{
f_();
}
private:
Function f_;
};
::pthread_t thread_;
bool joined_;
};
inline void* asio_detail_posix_thread_function(void* arg)
{
std::auto_ptr<posix_thread::func_base> f(
static_cast<posix_thread::func_base*>(arg));
f->run();
return 0;
}
} // namespace detail
} // namespace asio
#endif // defined(BOOST_HAS_PTHREADS)
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_POSIX_THREAD_HPP
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