/* Copyright (c) 2010, Google Inc.
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 *
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * ---
 * 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_