93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
//===-- ProcessRunLock.h ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_ProcessRunLock_h_
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#define liblldb_ProcessRunLock_h_
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// C Includes
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#include <stdint.h>
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#include <time.h>
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/lldb-defines.h"
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//----------------------------------------------------------------------
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/// Enumerations for broadcasting.
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//----------------------------------------------------------------------
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namespace lldb_private {
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//----------------------------------------------------------------------
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/// @class ProcessRunLock ProcessRunLock.h "lldb/Host/ProcessRunLock.h"
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/// @brief 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
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/// it is running.
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//----------------------------------------------------------------------
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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() : m_lock(nullptr) {}
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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;
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private:
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DISALLOW_COPY_AND_ASSIGN(ProcessRunLocker);
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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;
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private:
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DISALLOW_COPY_AND_ASSIGN(ProcessRunLock);
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};
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} // namespace lldb_private
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#endif // liblldb_ProcessRunLock_h_
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