contrib/llvm-project/lldb/source/Host/common/ProcessRunLock.cpp

   1 //===-- ProcessRunLock.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 #ifndef _WIN32
  10 #include "lldb/Host/ProcessRunLock.h"
  11
  12 namespace lldb_private {
  13
  14 ProcessRunLock::ProcessRunLock() : m_running(false) {
  15   int err = ::pthread_rwlock_init(&m_rwlock, nullptr);
  16   (void)err;
  17 }
  18
  19 ProcessRunLock::~ProcessRunLock() {
  20   int err = ::pthread_rwlock_destroy(&m_rwlock);
  21   (void)err;
  22 }
  23
  24 bool ProcessRunLock::ReadTryLock() {
  25   ::pthread_rwlock_rdlock(&m_rwlock);
  26   if (!m_running) {
  27     return true;
  28   }
  29   ::pthread_rwlock_unlock(&m_rwlock);
  30   return false;
  31 }
  32
  33 bool ProcessRunLock::ReadUnlock() {
  34   return ::pthread_rwlock_unlock(&m_rwlock) == 0;
  35 }
  36
  37 bool ProcessRunLock::SetRunning() {
  38   ::pthread_rwlock_wrlock(&m_rwlock);
  39   m_running = true;
  40   ::pthread_rwlock_unlock(&m_rwlock);
  41   return true;
  42 }
  43
  44 bool ProcessRunLock::TrySetRunning() {
  45   bool r;
  46
  47   if (::pthread_rwlock_trywrlock(&m_rwlock) == 0) {
  48     r = !m_running;
  49     m_running = true;
  50     ::pthread_rwlock_unlock(&m_rwlock);
  51     return r;
  52   }
  53   return false;
  54 }
  55
  56 bool ProcessRunLock::SetStopped() {
  57   ::pthread_rwlock_wrlock(&m_rwlock);
  58   m_running = false;
  59   ::pthread_rwlock_unlock(&m_rwlock);
  60   return true;
  61 }
  62 }
  63
  64 #endif