OnOffNotifier.h

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00001 /*
00002  *    Copyright 2006 Intel Corporation
00003  * 
00004  *    Licensed under the Apache License, Version 2.0 (the "License");
00005  *    you may not use this file except in compliance with the License.
00006  *    You may obtain a copy of the License at
00007  * 
00008  *        http://www.apache.org/licenses/LICENSE-2.0
00009  * 
00010  *    Unless required by applicable law or agreed to in writing, software
00011  *    distributed under the License is distributed on an "AS IS" BASIS,
00012  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *    See the License for the specific language governing permissions and
00014  *    limitations under the License.
00015  */
00016 
00017 
00018 #ifndef _OASYS_ONOFFNOTIFIER_H_
00019 #define _OASYS_ONOFFNOTIFIER_H_
00020 
00021 #include "SpinLock.h"
00022 #include "../debug/Log.h"
00023 #include "../debug/Logger.h"
00024 
00025 namespace oasys {
00026 
00027 class Lock;
00028 
00038 class OnOffNotifier : public Logger {
00039 public:
00044     OnOffNotifier(const char* logpath = 0, bool keep_quiet = true);
00045 
00049     ~OnOffNotifier();
00050 
00064     bool wait(Lock* lock = 0, int timeout = -1);
00065 
00071     void signal();
00072     
00076     void clear();
00077     
00081     int read_fd() { return pipe_[0]; }
00082     
00083 protected:
00084     bool waiter_; // for debugging only
00085     bool quiet_;  // no logging
00086 
00087     SpinLock notifier_lock_;
00088     bool     active_;
00089     int      pipe_[2];
00090 };
00091 
00092 } // namespace oasys
00093 
00094 #endif /* _OASYS_ONOFFNOTIFIER_H_ */

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