| /* Copyright (c) 2010, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * --- |
| * Author: Chris Ruemmler |
| */ |
| |
| #ifndef BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_ |
| #define BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_ |
| |
| #include "base/basictypes.h" |
| |
| namespace base { |
| |
| // We can do contention-profiling of SpinLocks, but the code is in |
| // mutex.cc, which is not always linked in with spinlock. Hence we |
| // provide a weak definition, which are used if mutex.cc isn't linked in. |
| |
| // Submit the number of cycles the spinlock spent contending. |
| ATTRIBUTE_WEAK extern void SubmitSpinLockProfileData(const void *, int64); |
| extern void SubmitSpinLockProfileData(const void *contendedlock, |
| int64 wait_cycles) {} |
| } |
| #endif // BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_ |
