/usr/include/CLAM/Mutex.hxx is in libclam-dev 1.4.0-5build1.
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) 2004 MUSIC TECHNOLOGY GROUP (MTG)
* UNIVERSITAT POMPEU FABRA
*
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __MUTEX__
#define __MUTEX__
#include <pthread.h>
#include "Lock.hxx"
#include <errno.h>
// http://www.boost.org/libs/thread/doc/mutex_concept.html
namespace CLAM
{
struct xtime;
/** From the www.boost.org docs:
* A mutex (short for mutual-exclusion) object is used to serializes access to a resource
* shared between multiple threads. The Mutex concept, with TryMutex and TimedMutex refinements,
* formalize the requirements. A model that implements Mutex and its refinements has two states:
* locked and unlocked. Before using a shared resource, a thread locks a Boost.Threads mutex object
* (an object whose type is a model of Mutex or one of it's refinements), insuring thread-safe
* access to the shared resource. When use of the shared resource is complete, the thread unlocks
* the mutex object, allowing another thread to acquire the lock and use the shared resource.
*/
class Mutex
{
public:
friend class Hidden::LockOps<Mutex>;
friend class Hidden::ScopedLock<Mutex>;
typedef Hidden::ScopedLock<Mutex> ScopedLock;
Mutex();
~Mutex();
private:
struct ConditionVar
{
pthread_mutex_t* pmutex;
};
void DoLock();
void DoUnlock();
void DoLock( ConditionVar& state );
void DoUnlock( ConditionVar& state );
pthread_mutex_t mMutex;
};
class TryMutex
{
public:
friend class Hidden::LockOps<TryMutex>;
typedef Hidden::ScopedLock<TryMutex> ScopedLock;
typedef Hidden::ScopedTryLock<TryMutex> ScopedTryLock;
TryMutex();
~TryMutex();
private:
struct ConditionVar
{
pthread_mutex_t* pmutex;
};
void DoLock();
bool DoTryLock();
void DoUnlock();
void DoLock( ConditionVar& state );
void DoUnlock( ConditionVar& state );
pthread_mutex_t mMutex;
};
class TimedMutex
{
public:
friend class Hidden::LockOps<TimedMutex>;
typedef Hidden::ScopedLock<TimedMutex> ScopedLock;
typedef Hidden::ScopedTryLock<TimedMutex> ScopedTryLock;
typedef Hidden::ScopedTimedLock<TimedMutex> ScopedTimedLock;
TimedMutex();
~TimedMutex();
private:
struct ConditionVar
{
pthread_mutex_t* pmutex;
};
void DoLock();
bool DoTryLock();
bool DoTimedLock( const xtime& xt );
void DoUnlock();
void DoLock( ConditionVar& state );
void DoUnlock( ConditionVar& state );
pthread_mutex_t mMutex;
pthread_cond_t mCondition;
bool mLocked;
};
} // end of namespace CLAM
#endif // Mutex.hxx
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