lldb/tools/debugserver/source/PThreadMutex.cpp

   1 //===-- PThreadMutex.cpp ----------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  Created by Greg Clayton on 12/9/08.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "PThreadMutex.h"
  14
  15 #include "DNBTimer.h"
  16
  17 #if defined(DEBUG_PTHREAD_MUTEX_DEADLOCKS)
  18
  19 PThreadMutex::Locker::Locker(PThreadMutex &m, const char *function,
  20                              const char *file, const int line)
  21     : m_pMutex(m.Mutex()), m_function(function), m_file(file), m_line(line),
  22       m_lock_time(0) {
  23   Lock();
  24 }
  25
  26 PThreadMutex::Locker::Locker(PThreadMutex *m, const char *function,
  27                              const char *file, const int line)
  28     : m_pMutex(m ? m->Mutex() : NULL), m_function(function), m_file(file),
  29       m_line(line), m_lock_time(0) {
  30   Lock();
  31 }
  32
  33 PThreadMutex::Locker::Locker(pthread_mutex_t *mutex, const char *function,
  34                              const char *file, const int line)
  35     : m_pMutex(mutex), m_function(function), m_file(file), m_line(line),
  36       m_lock_time(0) {
  37   Lock();
  38 }
  39
  40 PThreadMutex::Locker::~Locker() { Unlock(); }
  41
  42 void PThreadMutex::Locker::Lock() {
  43   if (m_pMutex) {
  44     m_lock_time = DNBTimer::GetTimeOfDay();
  45     if (::pthread_mutex_trylock(m_pMutex) != 0) {
  46       fprintf(stdout, "::pthread_mutex_trylock (%8.8p) mutex is locked "
  47                       "(function %s in %s:%i), waiting...\n",
  48               m_pMutex, m_function, m_file, m_line);
  49       ::pthread_mutex_lock(m_pMutex);
  50       fprintf(stdout, "::pthread_mutex_lock (%8.8p) succeeded after %6llu "
  51                       "usecs (function %s in %s:%i)\n",
  52               m_pMutex, DNBTimer::GetTimeOfDay() - m_lock_time, m_function,
  53               m_file, m_line);
  54     }
  55   }
  56 }
  57
  58 void PThreadMutex::Locker::Unlock() {
  59   fprintf(stdout, "::pthread_mutex_unlock (%8.8p) had lock for %6llu usecs in "
  60                   "%s in %s:%i\n",
  61           m_pMutex, DNBTimer::GetTimeOfDay() - m_lock_time, m_function, m_file,
  62           m_line);
  63   ::pthread_mutex_unlock(m_pMutex);
  64 }
  65
  66 #endif