1*0b57cec5SDimitry Andric //===-- ProcessRunLock.cpp ------------------------------------------------===//
2*0b57cec5SDimitry Andric //
3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*0b57cec5SDimitry Andric //
7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
8*0b57cec5SDimitry Andric 
9*0b57cec5SDimitry Andric #ifndef _WIN32
10*0b57cec5SDimitry Andric #include "lldb/Host/ProcessRunLock.h"
11*0b57cec5SDimitry Andric 
12*0b57cec5SDimitry Andric namespace lldb_private {
13*0b57cec5SDimitry Andric 
ProcessRunLock()14*0b57cec5SDimitry Andric ProcessRunLock::ProcessRunLock() {
15*0b57cec5SDimitry Andric   int err = ::pthread_rwlock_init(&m_rwlock, nullptr);
16*0b57cec5SDimitry Andric   (void)err;
17*0b57cec5SDimitry Andric }
18*0b57cec5SDimitry Andric 
~ProcessRunLock()19*0b57cec5SDimitry Andric ProcessRunLock::~ProcessRunLock() {
20*0b57cec5SDimitry Andric   int err = ::pthread_rwlock_destroy(&m_rwlock);
21*0b57cec5SDimitry Andric   (void)err;
22*0b57cec5SDimitry Andric }
23*0b57cec5SDimitry Andric 
ReadTryLock()24*0b57cec5SDimitry Andric bool ProcessRunLock::ReadTryLock() {
25*0b57cec5SDimitry Andric   ::pthread_rwlock_rdlock(&m_rwlock);
26*0b57cec5SDimitry Andric   if (!m_running) {
27*0b57cec5SDimitry Andric     // coverity[missing_unlock]
28*0b57cec5SDimitry Andric     return true;
29*0b57cec5SDimitry Andric   }
30*0b57cec5SDimitry Andric   ::pthread_rwlock_unlock(&m_rwlock);
31*0b57cec5SDimitry Andric   return false;
32*0b57cec5SDimitry Andric }
33*0b57cec5SDimitry Andric 
ReadUnlock()34*0b57cec5SDimitry Andric bool ProcessRunLock::ReadUnlock() {
35*0b57cec5SDimitry Andric   return ::pthread_rwlock_unlock(&m_rwlock) == 0;
36*0b57cec5SDimitry Andric }
37*0b57cec5SDimitry Andric 
SetRunning()38*0b57cec5SDimitry Andric bool ProcessRunLock::SetRunning() {
39*0b57cec5SDimitry Andric   ::pthread_rwlock_wrlock(&m_rwlock);
40*0b57cec5SDimitry Andric   m_running = true;
41*0b57cec5SDimitry Andric   ::pthread_rwlock_unlock(&m_rwlock);
42*0b57cec5SDimitry Andric   return true;
43*0b57cec5SDimitry Andric }
44*0b57cec5SDimitry Andric 
TrySetRunning()45*0b57cec5SDimitry Andric bool ProcessRunLock::TrySetRunning() {
46*0b57cec5SDimitry Andric   bool r;
47*0b57cec5SDimitry Andric 
48*0b57cec5SDimitry Andric   if (::pthread_rwlock_trywrlock(&m_rwlock) == 0) {
49*0b57cec5SDimitry Andric     r = !m_running;
50*0b57cec5SDimitry Andric     m_running = true;
51*0b57cec5SDimitry Andric     ::pthread_rwlock_unlock(&m_rwlock);
52*0b57cec5SDimitry Andric     return r;
53*0b57cec5SDimitry Andric   }
54*0b57cec5SDimitry Andric   return false;
55*0b57cec5SDimitry Andric }
56*0b57cec5SDimitry Andric 
SetStopped()57*0b57cec5SDimitry Andric bool ProcessRunLock::SetStopped() {
58*0b57cec5SDimitry Andric   ::pthread_rwlock_wrlock(&m_rwlock);
59*0b57cec5SDimitry Andric   m_running = false;
60*0b57cec5SDimitry Andric   ::pthread_rwlock_unlock(&m_rwlock);
61*0b57cec5SDimitry Andric   return true;
62*0b57cec5SDimitry Andric }
63*0b57cec5SDimitry Andric }
64*0b57cec5SDimitry Andric 
65 #endif
66