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_ */