Notifier.h

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00001 /*
00002  *    Copyright 2004-2006 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_NOTIFIER_H_
00019 #define _OASYS_NOTIFIER_H_
00020 
00021 #include "../debug/Log.h"
00022 #include "Lock.h"
00023 
00024 namespace oasys {
00025 
00026 class SpinLock;
00027 
00041 class Notifier : public Logger {
00042 public:
00047     Notifier(const char* logpath, bool keep_quiet = false);
00048 
00052     ~Notifier();
00053 
00063     bool wait(SpinLock* lock      = NULL, 
00064               int timeout         = -1, 
00065               bool drain_the_pipe = true);
00066 
00075     void notify(SpinLock* lock = NULL);
00076 
00083     void drain_pipe(size_t bytes);
00084 
00089     int read_fd() { return pipe_[0]; }
00090 
00094     int write_fd() { return pipe_[1]; }
00095     
00096 protected:
00097     bool waiter_; // for debugging only
00098     int  count_;  // for debugging as well
00099     int  pipe_[2];
00100     bool quiet_;  // no logging
00101     atomic_t busy_notifiers_; // keep track notifications in progress
00102 };
00103 
00104 } // namespace oasys
00105 
00106 #endif /* _OASYS_NOTIFIER_H_ */

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