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