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_ */