third_party/tcmalloc/chromium/src/base/synchronization_profiling.h

   1 /* Copyright (c) 2010, Google Inc.
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  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_