// AutoLocker.h // // Copyright (c) 2004, Ingo Weinhold (bonefish@cs.tu-berlin.de) // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. // // Except as contained in this notice, the name of a copyright holder shall // not be used in advertising or otherwise to promote the sale, use or other // dealings in this Software without prior written authorization of the // copyright holder. #ifndef AUTO_LOCKER_H #define AUTO_LOCKER_H #include // locking // AutoLockerStandardLocking template class AutoLockerStandardLocking { public: inline bool Lock(Lockable *lockable) { return lockable->Lock(); } inline void Unlock(Lockable *lockable) { lockable->Unlock(); } }; // AutoLockerReadLocking template class AutoLockerReadLocking { public: inline bool Lock(Lockable *lockable) { return lockable->ReadLock(); } inline void Unlock(Lockable *lockable) { lockable->ReadUnlock(); } }; // AutoLockerWriteLocking template class AutoLockerWriteLocking { public: inline bool Lock(Lockable *lockable) { return lockable->WriteLock(); } inline void Unlock(Lockable *lockable) { lockable->WriteUnlock(); } }; // AutoLocker template > class AutoLocker { private: typedef AutoLocker ThisClass; public: inline AutoLocker(Lockable *lockable, bool alreadyLocked = false) : fLockable(lockable), fLocked(fLockable && alreadyLocked) { if (!fLocked) _Lock(); } inline AutoLocker(Lockable &lockable, bool alreadyLocked = false) : fLockable(&lockable), fLocked(fLockable && alreadyLocked) { if (!fLocked) _Lock(); } inline ~AutoLocker() { Unlock(); } inline void SetTo(Lockable *lockable, bool alreadyLocked) { Unlock(); fLockable = lockable; fLocked = alreadyLocked; if (!fLocked) _Lock(); } inline void SetTo(Lockable &lockable, bool alreadyLocked) { SetTo(&lockable, alreadyLocked); } inline void Unset() { Unlock(); } inline AutoLocker &operator=(Lockable *lockable) { SetTo(lockable); return *this; } inline AutoLocker &operator=(Lockable &lockable) { SetTo(&lockable); return *this; } inline bool IsLocked() const { return fLocked; } inline void Unlock() { if (fLockable && fLocked) { fLocking.Unlock(fLockable); fLocked = false; } } inline operator bool() const { return fLocked; } private: inline void _Lock() { if (fLockable) fLocked = fLocking.Lock(fLockable); } private: Lockable *fLockable; bool fLocked; Locking fLocking; }; #endif // AUTO_LOCKER_H