Gabriele Cosmo
118 lines
3.9 KiB
C++
118 lines
3.9 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id$
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//
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// ---------------------------------------------------------------
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// GEANT 4 class header file
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//
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// Class Description:
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//
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// This class provides a mechanism to create a mutex and locks/unlocks it.
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// Can be used by applications to implement in a portable way a mutexing logic.
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// Usage Example:
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//
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// #include "G4Threading.hh"
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// #include "G4AutoLock.hh"
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// /* somehwere */
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// G4Mutex aMutex = G4MUTEX_INITIALIZER;
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// /*
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// somewhere else:
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// The G4AutoLock instance will automatically unlock the mutex when it
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// goes out of scope, lock and unlock method are anyway available for
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// explicit handling of mutex lock. */
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// G4AutoLock l(&aMutex);
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// ProtectedCode();
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// l.unlock(); //explicit unlock
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// UnprotectedCode();
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// l.lock(); //explicit lock
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//
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// Note that G4AutoLock is defined also for a sequential Geant4 build,
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// but has no effect.
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// ---------------------------------------------------------------
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// Author: Andrea Dotti (15 Feb 2013): First Implementation
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// ---------------------------------------------------------------
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#ifndef G4AUTOLOCK_HH
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#define G4AUTOLOCK_HH
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#include "G4Threading.hh"
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// Note: Note that G4TemplateAutoLock by itself is not thread-safe and
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// cannot be shared among threads due to the locked switch
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//
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template<class M, typename L, typename U>
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class G4TemplateAutoLock
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{
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public:
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G4TemplateAutoLock(M* mtx, L l, U u) : locked(false), _m(mtx), _l(l), _u(u)
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{
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lock();
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}
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virtual ~G4TemplateAutoLock()
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{
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unlock();
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}
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inline void unlock() {
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if ( !locked ) return;
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_u(_m);
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locked = false;
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}
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inline void lock() {
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if ( locked ) return;
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_l(_m);
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locked = true;
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}
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private:
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// Disable copy and assignement operators
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//
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G4TemplateAutoLock( const G4TemplateAutoLock& rhs );
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G4TemplateAutoLock& operator= ( const G4TemplateAutoLock& rhs );
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private:
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G4bool locked;
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M* _m;
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L _l;
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U _u;
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};
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struct G4ImpMutexAutoLock
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: public G4TemplateAutoLock<G4Mutex,thread_lock,thread_unlock>
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{
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G4ImpMutexAutoLock(G4Mutex* mtx)
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: G4TemplateAutoLock<G4Mutex, thread_lock, thread_unlock>
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(mtx, &G4MUTEXLOCK, &G4MUTEXUNLOCK) {}
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};
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typedef G4ImpMutexAutoLock G4AutoLock;
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#endif //G4AUTOLOCK_HH
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