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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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