condition.h

功能非常强的写日志程序

/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef _LOG4CXX_HELPERS_CONDITION_H
#define _LOG4CXX_HELPERS_CONDITION_H

#include <log4cxx/config.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/helpers/mutex.h>
#include <log4cxx/helpers/semaphore.h>

#ifdef HAVE_PTHREAD
#include <pthread.h>
#endif

namespace log4cxx
{
	namespace helpers
	{
		class LOG4CXX_EXPORT ConditionException : public Exception
		{
		};

		class LOG4CXX_EXPORT Condition
		{
		public:
			Condition();
			~Condition();
			void broadcast();
			void signal();
			void wait(Mutex& mutex);
			void wait(Mutex& mutex, long timeOut);

		protected:
#ifdef HAVE_PTHREAD
			pthread_cond_t condition;
#elif defined(HAVE_MS_THREAD)
			/// Number of waiting threads.
			long volatile waiters;

			/// Queue up threads waiting for the condition to become signaled.
			Semaphore sema;

			/**
			* An auto reset event used by the broadcast/signal thread to wait
			* for the waiting thread(s) to wake up and get a chance at the
			* semaphore.
			*/
			void * waitersDone;

			/// Keeps track of whether we were broadcasting or just signaling.
			bool wasBroadCast;
#endif
		};
	} // namespace helpers
};// namespace log4cxx

#endif //_LOG4CXX_HELPERS_CONDITION_H