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| //===-- ProcessRunLock.h ----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ProcessRunLock_h_
#define liblldb_ProcessRunLock_h_
#include <stdint.h>
#include <time.h>
#include "lldb/lldb-defines.h"
/// Enumerations for broadcasting.
namespace lldb_private {
/// \class ProcessRunLock ProcessRunLock.h "lldb/Host/ProcessRunLock.h"
/// A class used to prevent the process from starting while other
/// threads are accessing its data, and prevent access to its data while it is
/// running.
class ProcessRunLock {
public:
ProcessRunLock();
~ProcessRunLock();
bool ReadTryLock();
bool ReadUnlock();
bool SetRunning();
bool TrySetRunning();
bool SetStopped();
class ProcessRunLocker {
public:
ProcessRunLocker() : m_lock(nullptr) {}
~ProcessRunLocker() { Unlock(); }
// Try to lock the read lock, but only do so if there are no writers.
bool TryLock(ProcessRunLock *lock) {
if (m_lock) {
if (m_lock == lock)
return true; // We already have this lock locked
else
Unlock();
}
if (lock) {
if (lock->ReadTryLock()) {
m_lock = lock;
return true;
}
}
return false;
}
protected:
void Unlock() {
if (m_lock) {
m_lock->ReadUnlock();
m_lock = nullptr;
}
}
ProcessRunLock *m_lock;
private:
DISALLOW_COPY_AND_ASSIGN(ProcessRunLocker);
};
protected:
lldb::rwlock_t m_rwlock;
bool m_running;
private:
DISALLOW_COPY_AND_ASSIGN(ProcessRunLock);
};
} // namespace lldb_private
#endif // liblldb_ProcessRunLock_h_
|