/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /*! * @header NSLSemaphore */ #ifndef _NSLSemaphore_H_ #define _NSLSemaphore_H_ /**** Required system headers. ****/ // ANSI / POSIX headers #include <unistd.h> // for _POSIX_THREADS #include <pthread.h> // for pthread_*_t // Universal / CoreFoundation Headers #include <CoreFoundation/CoreFoundation.h> /****************************************************************************** ==> NSLSemaphore class definition <== ******************************************************************************/ class NSLSemaphore { public: /**** Typedefs, enums and constants. ****/ enum eWaitTime { kForever = -1, kNever = 0 } ; enum eErr { semDestroyedErr = 28020, semTimedOutErr, semNotOwnerErr, semAlreadyResetErr, semOtherErr } ; /**** Instance method protoypes. ****/ // ctor and dtor. NSLSemaphore ( SInt32 initialCount = 0 ) ; virtual ~NSLSemaphore ( void ) ; // New methods. virtual void Signal ( void ) ; virtual OSStatus Wait ( SInt32 milliSecs = kForever ) ; protected: /**** Instance variables. ****/ pthread_mutex_t mConditionLock ; pthread_cond_t mSemaphore ; SInt32 mExcessSignals ; bool mDestroying ; private: /**** Invalid methods and undefined operations. ****/ // Copy constructor NSLSemaphore ( const NSLSemaphore & ) ; // Assignment NSLSemaphore & operator= ( const NSLSemaphore & ) ; } ; #endif /* _NSLSemaphore_H_ */