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//===-- LockFileBase.h ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_Host_LockFileBase_h_
#define liblldb_Host_LockFileBase_h_
#include "lldb/Core/Error.h"
#include <functional>
namespace lldb_private {
class LockFileBase {
public:
virtual ~LockFileBase() = default;
bool IsLocked() const;
Error WriteLock(const uint64_t start, const uint64_t len);
Error TryWriteLock(const uint64_t start, const uint64_t len);
Error ReadLock(const uint64_t start, const uint64_t len);
Error TryReadLock(const uint64_t start, const uint64_t len);
Error Unlock();
protected:
using Locker = std::function<Error(const uint64_t, const uint64_t)>;
LockFileBase(int fd);
virtual bool IsValidFile() const;
virtual Error DoWriteLock(const uint64_t start, const uint64_t len) = 0;
virtual Error DoTryWriteLock(const uint64_t start, const uint64_t len) = 0;
virtual Error DoReadLock(const uint64_t start, const uint64_t len) = 0;
virtual Error DoTryReadLock(const uint64_t start, const uint64_t len) = 0;
virtual Error DoUnlock() = 0;
Error DoLock(const Locker &locker, const uint64_t start, const uint64_t len);
int m_fd; // not owned.
bool m_locked;
uint64_t m_start;
uint64_t m_len;
};
}
#endif
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