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1 //===-- LockFileBase.cpp --------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "lldb/Host/LockFileBase.h"
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10
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11 using namespace lldb;
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12 using namespace lldb_private;
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13
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236
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14 static Status AlreadyLocked() { return Status("Already locked"); }
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150
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15
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236
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16 static Status NotLocked() { return Status("Not locked"); }
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150
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17
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18 LockFileBase::LockFileBase(int fd)
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19 : m_fd(fd), m_locked(false), m_start(0), m_len(0) {}
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20
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21 bool LockFileBase::IsLocked() const { return m_locked; }
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22
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23 Status LockFileBase::WriteLock(const uint64_t start, const uint64_t len) {
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24 return DoLock([&](const uint64_t start,
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25 const uint64_t len) { return DoWriteLock(start, len); },
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26 start, len);
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27 }
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28
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29 Status LockFileBase::TryWriteLock(const uint64_t start, const uint64_t len) {
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30 return DoLock([&](const uint64_t start,
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31 const uint64_t len) { return DoTryWriteLock(start, len); },
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32 start, len);
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33 }
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34
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35 Status LockFileBase::ReadLock(const uint64_t start, const uint64_t len) {
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36 return DoLock([&](const uint64_t start,
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37 const uint64_t len) { return DoReadLock(start, len); },
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38 start, len);
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39 }
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40
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41 Status LockFileBase::TryReadLock(const uint64_t start, const uint64_t len) {
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42 return DoLock([&](const uint64_t start,
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43 const uint64_t len) { return DoTryReadLock(start, len); },
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44 start, len);
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45 }
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46
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47 Status LockFileBase::Unlock() {
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48 if (!IsLocked())
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49 return NotLocked();
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50
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51 const auto error = DoUnlock();
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52 if (error.Success()) {
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53 m_locked = false;
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54 m_start = 0;
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55 m_len = 0;
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56 }
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57 return error;
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58 }
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59
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60 bool LockFileBase::IsValidFile() const { return m_fd != -1; }
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61
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62 Status LockFileBase::DoLock(const Locker &locker, const uint64_t start,
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63 const uint64_t len) {
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64 if (!IsValidFile())
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65 return Status("File is invalid");
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66
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67 if (IsLocked())
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68 return AlreadyLocked();
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69
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70 const auto error = locker(start, len);
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71 if (error.Success()) {
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72 m_locked = true;
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73 m_start = start;
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74 m_len = len;
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75 }
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76
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77 return error;
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78 }
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