/usr/include/stxxl/bits/common/mutex.h is in libstxxl-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* include/stxxl/bits/common/mutex.h
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2002 Roman Dementiev <dementiev@mpi-sb.mpg.de>
* Copyright (C) 2008 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
*
* 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 STXXL_MUTEX_HEADER
#define STXXL_MUTEX_HEADER
#include <stxxl/bits/namespace.h>
#ifdef STXXL_BOOST_THREADS
#include <boost/thread/mutex.hpp>
#else
#include <pthread.h>
#include <cerrno>
#include <stxxl/bits/noncopyable.h>
#include <stxxl/bits/common/error_handling.h>
#endif
__STXXL_BEGIN_NAMESPACE
#ifdef STXXL_BOOST_THREADS
typedef boost::mutex mutex;
#else
class mutex : private noncopyable
{
pthread_mutex_t _mutex;
public:
mutex()
{
check_pthread_call(pthread_mutex_init(&_mutex, NULL));
}
~mutex()
{
int res = pthread_mutex_trylock(&_mutex);
if (res == 0 || res == EBUSY) {
check_pthread_call(pthread_mutex_unlock(&_mutex));
} else
stxxl_function_error(resource_error);
check_pthread_call(pthread_mutex_destroy(&_mutex));
}
void lock()
{
check_pthread_call(pthread_mutex_lock(&_mutex));
}
void unlock()
{
check_pthread_call(pthread_mutex_unlock(&_mutex));
}
};
#endif
#ifdef STXXL_BOOST_THREADS
typedef boost::mutex::scoped_lock scoped_mutex_lock;
#else
//! \brief Aquire a lock that's valid until the end of scope
class scoped_mutex_lock
{
mutex & mtx;
bool is_locked;
public:
scoped_mutex_lock(mutex & mtx_) : mtx(mtx_), is_locked(false)
{
lock();
}
~scoped_mutex_lock()
{
unlock();
}
void lock()
{
if (!is_locked) {
mtx.lock();
is_locked = true;
}
}
void unlock()
{
if (is_locked) {
mtx.unlock();
is_locked = false;
}
}
};
#endif
__STXXL_END_NAMESPACE
#endif // !STXXL_MUTEX_HEADER
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