SpinLock.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_SPINLOCK_H_
00019 #define _OASYS_SPINLOCK_H_
00020 
00021 #include "Lock.h"
00022 
00023 namespace oasys {
00024 
00029 class SpinLock : public Lock {
00030 public:
00031 
00032 public:
00033     SpinLock() : Lock(), lock_waiters_(0) {}
00034     virtual ~SpinLock() {}
00035 
00038     int lock(const char* lock_user);
00039     int unlock();
00040     int try_lock(const char* lock_user);
00042 
00045     static bool warn_on_contention_;
00046     
00047 private:
00048     atomic_t lock_waiters_;     
00049 
00050 #ifndef NDEBUG
00051 public:
00052     static atomic_t total_spins_;       
00053     static atomic_t total_yields_;      
00054 #endif
00055 };
00056 
00057 } // namespace oasys
00058 
00059 #endif /* _OASYS_SPINLOCK_H_ */

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