6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
//===-- ProcessRunLock.h ----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_HOST_PROCESSRUNLOCK_H
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#define LLDB_HOST_PROCESSRUNLOCK_H
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#include <cstdint>
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#include <ctime>
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#include "lldb/lldb-defines.h"
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/// Enumerations for broadcasting.
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namespace lldb_private {
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/// \class ProcessRunLock ProcessRunLock.h "lldb/Host/ProcessRunLock.h"
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/// A class used to prevent the process from starting while other
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/// threads are accessing its data, and prevent access to its data while it is
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/// running.
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class ProcessRunLock {
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public:
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ProcessRunLock();
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~ProcessRunLock();
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bool ReadTryLock();
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bool ReadUnlock();
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bool SetRunning();
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bool TrySetRunning();
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bool SetStopped();
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class ProcessRunLocker {
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public:
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ProcessRunLocker() = default;
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~ProcessRunLocker() { Unlock(); }
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// Try to lock the read lock, but only do so if there are no writers.
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bool TryLock(ProcessRunLock *lock) {
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if (m_lock) {
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if (m_lock == lock)
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return true; // We already have this lock locked
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else
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Unlock();
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}
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if (lock) {
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if (lock->ReadTryLock()) {
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m_lock = lock;
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return true;
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}
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}
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return false;
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}
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protected:
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void Unlock() {
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if (m_lock) {
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m_lock->ReadUnlock();
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m_lock = nullptr;
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}
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}
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ProcessRunLock *m_lock = nullptr;
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private:
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ProcessRunLocker(const ProcessRunLocker &) = delete;
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const ProcessRunLocker &operator=(const ProcessRunLocker &) = delete;
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};
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protected:
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lldb::rwlock_t m_rwlock;
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bool m_running = false;
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private:
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ProcessRunLock(const ProcessRunLock &) = delete;
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const ProcessRunLock &operator=(const ProcessRunLock &) = delete;
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};
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} // namespace lldb_private
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#endif // LLDB_HOST_PROCESSRUNLOCK_H
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