hphp/util/lock.cpp

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #include "hphp/util/lock.h"
  18 #include "hphp/util/stack-trace.h"
  19 #include "hphp/util/timer.h"
  20
  21 namespace HPHP {
  22 ///////////////////////////////////////////////////////////////////////////////
  23
  24 LockProfiler::PFUNC_PROFILE LockProfiler::s_pfunc_profile = nullptr;
  25 bool LockProfiler::s_profile = false;
  26 int LockProfiler::s_profile_sampling = 1000;
  27
  28 LockProfiler::LockProfiler(bool profile) : m_profiling(false) {
  29   if (s_profile && s_pfunc_profile && profile &&
  30       s_profile_sampling && (rand() % s_profile_sampling) == 0) {
  31     m_profiling = true;
  32     Timer::GetMonotonicTime(m_lockTime);
  33   }
  34 }
  35
  36 LockProfiler::~LockProfiler() {
  37   if (m_profiling) {
  38     timespec unlockTime;
  39     Timer::GetMonotonicTime(unlockTime);
  40     time_t dsec = unlockTime.tv_sec - m_lockTime.tv_sec;
  41     long dnsec = unlockTime.tv_nsec - m_lockTime.tv_nsec;
  42     int64_t dusec = dsec * 1000000 + dnsec / 1000;
  43
  44     StackTrace st;
  45     s_pfunc_profile(st.hexEncode(3, 9), dusec);
  46   }
  47 }
  48
  49 ///////////////////////////////////////////////////////////////////////////////
  50 }