| 55 | } |
| 56 | |
| 57 | bool FileLock::doLock(LockType lockType, bool wait, bool *tryAgain) { |
| 58 | if (!isFileLockValid()) { |
| 59 | return false; |
| 60 | } |
| 61 | bool unLockFirstIfNeeded = false; |
| 62 | |
| 63 | if (lockType == SharedLockType) { |
| 64 | // don't want shared-lock to break any existing locks |
| 65 | if (m_sharedLockCount > 0 || m_exclusiveLockCount > 0) { |
| 66 | m_sharedLockCount++; |
| 67 | return true; |
| 68 | } |
| 69 | } else { |
| 70 | // don't want exclusive-lock to break existing exclusive-locks |
| 71 | if (m_exclusiveLockCount > 0) { |
| 72 | m_exclusiveLockCount++; |
| 73 | return true; |
| 74 | } |
| 75 | // prevent deadlock |
| 76 | if (m_sharedLockCount > 0) { |
| 77 | unLockFirstIfNeeded = true; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | auto ret = platformLock(lockType, wait, unLockFirstIfNeeded, tryAgain); |
| 82 | if (ret) { |
| 83 | if (lockType == SharedLockType) { |
| 84 | m_sharedLockCount++; |
| 85 | } else { |
| 86 | m_exclusiveLockCount++; |
| 87 | } |
| 88 | } |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | #ifndef MMKV_WIN32 |
| 93 |
nothing calls this directly
no outgoing calls
no test coverage detected