source/Host/common/ProcessRunLock.cpp

   1 //===-- ProcessRunLock.cpp --------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef _WIN32
  11 #include "lldb/Host/ProcessRunLock.h"
  12
  13 namespace lldb_private {
  14
  15 ProcessRunLock::ProcessRunLock() : m_running(false) {
  16   int err = ::pthread_rwlock_init(&m_rwlock, NULL);
  17   (void)err;
  18   //#if LLDB_CONFIGURATION_DEBUG
  19   //        assert(err == 0);
  20   //#endif
  21 }
  22
  23 ProcessRunLock::~ProcessRunLock() {
  24   int err = ::pthread_rwlock_destroy(&m_rwlock);
  25   (void)err;
  26   //#if LLDB_CONFIGURATION_DEBUG
  27   //        assert(err == 0);
  28   //#endif
  29 }
  30
  31 bool ProcessRunLock::ReadTryLock() {
  32   ::pthread_rwlock_rdlock(&m_rwlock);
  33   if (m_running == false) {
  34     return true;
  35   }
  36   ::pthread_rwlock_unlock(&m_rwlock);
  37   return false;
  38 }
  39
  40 bool ProcessRunLock::ReadUnlock() {
  41   return ::pthread_rwlock_unlock(&m_rwlock) == 0;
  42 }
  43
  44 bool ProcessRunLock::SetRunning() {
  45   ::pthread_rwlock_wrlock(&m_rwlock);
  46   m_running = true;
  47   ::pthread_rwlock_unlock(&m_rwlock);
  48   return true;
  49 }
  50
  51 bool ProcessRunLock::TrySetRunning() {
  52   bool r;
  53
  54   if (::pthread_rwlock_trywrlock(&m_rwlock) == 0) {
  55     r = !m_running;
  56     m_running = true;
  57     ::pthread_rwlock_unlock(&m_rwlock);
  58     return r;
  59   }
  60   return false;
  61 }
  62
  63 bool ProcessRunLock::SetStopped() {
  64   ::pthread_rwlock_wrlock(&m_rwlock);
  65   m_running = false;
  66   ::pthread_rwlock_unlock(&m_rwlock);
  67   return true;
  68 }
  69 }
  70
  71 #endif