1 | //===-- LockFileBase.h ------------------------------------------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #ifndef LLDB_HOST_LOCKFILEBASE_H |
10 | #define LLDB_HOST_LOCKFILEBASE_H |
11 | |
12 | #include "lldb/Utility/Status.h" |
13 | |
14 | #include <functional> |
15 | |
16 | namespace lldb_private { |
17 | |
18 | class LockFileBase { |
19 | public: |
20 | virtual ~LockFileBase() = default; |
21 | |
22 | bool IsLocked() const; |
23 | |
24 | Status WriteLock(const uint64_t start, const uint64_t len); |
25 | Status TryWriteLock(const uint64_t start, const uint64_t len); |
26 | |
27 | Status ReadLock(const uint64_t start, const uint64_t len); |
28 | Status TryReadLock(const uint64_t start, const uint64_t len); |
29 | |
30 | Status Unlock(); |
31 | |
32 | protected: |
33 | using Locker = std::function<Status(const uint64_t, const uint64_t)>; |
34 | |
35 | LockFileBase(int fd); |
36 | |
37 | virtual bool IsValidFile() const; |
38 | |
39 | virtual Status DoWriteLock(const uint64_t start, const uint64_t len) = 0; |
40 | virtual Status DoTryWriteLock(const uint64_t start, const uint64_t len) = 0; |
41 | |
42 | virtual Status DoReadLock(const uint64_t start, const uint64_t len) = 0; |
43 | virtual Status DoTryReadLock(const uint64_t start, const uint64_t len) = 0; |
44 | |
45 | virtual Status DoUnlock() = 0; |
46 | |
47 | Status DoLock(const Locker &locker, const uint64_t start, const uint64_t len); |
48 | |
49 | int m_fd; // not owned. |
50 | bool m_locked; |
51 | uint64_t m_start; |
52 | uint64_t m_len; |
53 | }; |
54 | } |
55 | |
56 | #endif |
57 | |