00001 /* 00002 * IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. By 00003 * downloading, copying, installing or using the software you agree to 00004 * this license. If you do not agree to this license, do not download, 00005 * install, copy or use the software. 00006 * 00007 * Intel Open Source License 00008 * 00009 * Copyright (c) 2004 Intel Corporation. All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without 00012 * modification, are permitted provided that the following conditions are 00013 * met: 00014 * 00015 * Redistributions of source code must retain the above copyright 00016 * notice, this list of conditions and the following disclaimer. 00017 * 00018 * Redistributions in binary form must reproduce the above copyright 00019 * notice, this list of conditions and the following disclaimer in the 00020 * documentation and/or other materials provided with the distribution. 00021 * 00022 * Neither the name of the Intel Corporation nor the names of its 00023 * contributors may be used to endorse or promote products derived from 00024 * this software without specific prior written permission. 00025 * 00026 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00027 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00028 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00029 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL OR 00030 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00031 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00032 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00033 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00034 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00035 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00036 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00037 */ 00038 00039 #ifndef _OASYS_SPINLOCK_H_ 00040 #define _OASYS_SPINLOCK_H_ 00041 00042 #include "Lock.h" 00043 00044 namespace oasys { 00045 00050 class SpinLock : public Lock { 00051 public: 00052 00053 public: 00054 SpinLock() : Lock(), lock_waiters_(0) {} 00055 virtual ~SpinLock() {} 00056 00059 int lock(const char* lock_user); 00060 int unlock(); 00061 int try_lock(const char* lock_user); 00063 00066 static bool warn_on_contention_; 00067 00068 private: 00069 atomic_t lock_waiters_; 00070 00071 #ifndef NDEBUG 00072 public: 00073 static atomic_t total_spins_; 00074 static atomic_t total_yields_; 00075 #endif 00076 }; 00077 00078 } // namespace oasys 00079 00080 #endif /* _OASYS_SPINLOCK_H_ */