/usr/include/eiskaltdcpp/dcpp/CriticalSection.h is in libeiskaltdcpp-dev 2.2.9-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "debug.h"
#include "noexcept.h"
#ifndef DO_NOT_USE_MUTEX
#if defined (_WIN32)
#include <boost/thread/recursive_mutex.hpp>
#ifdef FIX_FOR_OLD_BOOST
template <typename Mutex>
class lock_guard
{
private:
Mutex& m;
public:
explicit lock_guard(Mutex& m_) : m(m_)
{
m.lock();
}
lock_guard(Mutex& m_, boost::adopt_lock_t) : m(m_)
{
m.lock();
}
~lock_guard()
{
m.unlock();
}
};
#else // FIX_FOR_OLD_BOOST
#include <boost/thread/lock_guard.hpp>
#endif // FIX_FOR_OLD_BOOST
#else
#include <mutex>
#endif
namespace dcpp {
#if defined (_WIN32)
typedef boost::recursive_mutex CriticalSection;
typedef boost::detail::spinlock FastCriticalSection;
typedef boost::unique_lock<boost::recursive_mutex> Lock;
typedef boost::lock_guard<boost::detail::spinlock> FastLock;
#else
typedef std::recursive_mutex CriticalSection;
typedef std::mutex FastCriticalSection;
typedef std::unique_lock<std::recursive_mutex> Lock;
typedef std::lock_guard<std::mutex> FastLock;
#endif
} // namespace dcpp
#else // DO_NOT_USE_MUTEX
#include <boost/signals2/mutex.hpp>
namespace dcpp {
class CriticalSection
{
#ifdef _WIN32
public:
void lock() noexcept {
EnterCriticalSection(&cs);
dcdrun(counter++);
}
void unlock() noexcept {
dcassert(--counter >= 0);
LeaveCriticalSection(&cs);
}
CriticalSection() noexcept {
dcdrun(counter = 0;);
InitializeCriticalSection(&cs);
}
~CriticalSection() noexcept {
dcassert(counter==0);
DeleteCriticalSection(&cs);
}
private:
dcdrun(long counter);
CRITICAL_SECTION cs;
#else // _WIN32
public:
CriticalSection() noexcept {
pthread_mutexattr_init(&ma);
pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&mtx, &ma);
}
~CriticalSection() noexcept {
pthread_mutex_destroy(&mtx);
pthread_mutexattr_destroy(&ma);
}
void lock() noexcept { pthread_mutex_lock(&mtx); }
void unlock() noexcept { pthread_mutex_unlock(&mtx); }
pthread_mutex_t& getMutex() { return mtx; }
private:
pthread_mutex_t mtx;
pthread_mutexattr_t ma;
#endif // _WIN32
CriticalSection(const CriticalSection&);
CriticalSection& operator=(const CriticalSection&);
};
// A fast, non-recursive and unfair implementation of the Critical Section.
// It is meant to be used in situations where the risk for lock conflict is very low,
// i.e. locks that are held for a very short time. The lock is _not_ recursive, i e if
// the same thread will try to grab the lock it'll hang in a never-ending loop. The lock
// is not fair, i e the first to try to lock a locked lock is not guaranteed to be the
// first to get it when it's freed...
class FastCriticalSection {
public:
void lock() { mtx.lock(); }
void unlock() { mtx.unlock(); }
private:
typedef boost::signals2::mutex mutex_t;
mutex_t mtx;
};
template<class T>
class LockBase {
public:
LockBase(T& aCs) noexcept : cs(aCs) { cs.lock(); }
~LockBase() noexcept { cs.unlock(); }
private:
LockBase& operator=(const LockBase&);
T& cs;
};
typedef LockBase<CriticalSection> Lock;
typedef LockBase<FastCriticalSection> FastLock;
}
#endif // DO_NOT_USE_MUTEX
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