| 1 | //===-- ProcessRunLock.cpp ------------------------------------------------===// |
|---|---|
| 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 | #include "lldb/Host/ProcessRunLock.h" |
| 10 | #include "lldb/Host/windows/windows.h" |
| 11 | |
| 12 | static PSRWLOCK GetLock(lldb::rwlock_t lock) { |
| 13 | return static_cast<PSRWLOCK>(lock); |
| 14 | } |
| 15 | |
| 16 | static bool ReadLock(lldb::rwlock_t rwlock) { |
| 17 | ::AcquireSRWLockShared(GetLock(rwlock)); |
| 18 | return true; |
| 19 | } |
| 20 | |
| 21 | static bool ReadUnlock(lldb::rwlock_t rwlock) { |
| 22 | ::ReleaseSRWLockShared(GetLock(rwlock)); |
| 23 | return true; |
| 24 | } |
| 25 | |
| 26 | static bool WriteLock(lldb::rwlock_t rwlock) { |
| 27 | ::AcquireSRWLockExclusive(GetLock(rwlock)); |
| 28 | return true; |
| 29 | } |
| 30 | |
| 31 | static bool WriteTryLock(lldb::rwlock_t rwlock) { |
| 32 | return !!::TryAcquireSRWLockExclusive(GetLock(rwlock)); |
| 33 | } |
| 34 | |
| 35 | static bool WriteUnlock(lldb::rwlock_t rwlock) { |
| 36 | ::ReleaseSRWLockExclusive(GetLock(rwlock)); |
| 37 | return true; |
| 38 | } |
| 39 | |
| 40 | using namespace lldb_private; |
| 41 | |
| 42 | ProcessRunLock::ProcessRunLock() : m_running(false) { |
| 43 | m_rwlock = new SRWLOCK; |
| 44 | InitializeSRWLock(GetLock(m_rwlock)); |
| 45 | } |
| 46 | |
| 47 | ProcessRunLock::~ProcessRunLock() { delete static_cast<SRWLOCK *>(m_rwlock); } |
| 48 | |
| 49 | bool ProcessRunLock::ReadTryLock() { |
| 50 | ::ReadLock(rwlock: m_rwlock); |
| 51 | if (m_running == false) |
| 52 | return true; |
| 53 | ::ReadUnlock(rwlock: m_rwlock); |
| 54 | return false; |
| 55 | } |
| 56 | |
| 57 | bool ProcessRunLock::ReadUnlock() { return ::ReadUnlock(rwlock: m_rwlock); } |
| 58 | |
| 59 | bool ProcessRunLock::SetRunning() { |
| 60 | WriteLock(rwlock: m_rwlock); |
| 61 | m_running = true; |
| 62 | WriteUnlock(rwlock: m_rwlock); |
| 63 | return true; |
| 64 | } |
| 65 | |
| 66 | bool ProcessRunLock::TrySetRunning() { |
| 67 | if (WriteTryLock(rwlock: m_rwlock)) { |
| 68 | bool was_running = m_running; |
| 69 | m_running = true; |
| 70 | WriteUnlock(rwlock: m_rwlock); |
| 71 | return !was_running; |
| 72 | } |
| 73 | return false; |
| 74 | } |
| 75 | |
| 76 | bool ProcessRunLock::SetStopped() { |
| 77 | WriteLock(rwlock: m_rwlock); |
| 78 | m_running = false; |
| 79 | WriteUnlock(rwlock: m_rwlock); |
| 80 | return true; |
| 81 | } |
| 82 |