1 /* Copyright (c) 2010, Google Inc. 2 * All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * --- 31 * Author: Chris Ruemmler 32 */ 33 34 #ifndef BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_ 35 #define BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_ 36 37 #include "base/basictypes.h" 38 39 namespace base { 40 41 // We can do contention-profiling of SpinLocks, but the code is in 42 // mutex.cc, which is not always linked in with spinlock. Hence we 43 // provide a weak definition, which are used if mutex.cc isn't linked in. 44 45 // Submit the number of cycles the spinlock spent contending. 46 ATTRIBUTE_WEAK extern void SubmitSpinLockProfileData(const void *, int64); 47 extern void SubmitSpinLockProfileData(const void *contendedlock, 48 int64 wait_cycles) {} 49 } 50 #endif // BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_ 51
