Function LockOrUnlock

src/leveldb/util/env_windows.cc:348–360

Lock or unlock the entire file as specified by |lock|. Returns true when successful, false upon failure. Caller should call ::GetLastError() to determine cause of failure

// when successful, false upon failure. Caller should call ::GetLastError()
// to determine cause of failure
bool LockOrUnlock(HANDLE handle, bool lock) {
  if (lock) {
    return ::LockFile(handle,
                      /*dwFileOffsetLow=*/0, /*dwFileOffsetHigh=*/0,
                      /*nNumberOfBytesToLockLow=*/MAXDWORD,
                      /*nNumberOfBytesToLockHigh=*/MAXDWORD);
  } else {
    return ::UnlockFile(handle,
                        /*dwFileOffsetLow=*/0, /*dwFileOffsetHigh=*/0,
                        /*nNumberOfBytesToLockLow=*/MAXDWORD,
                        /*nNumberOfBytesToLockHigh=*/MAXDWORD);
  }
}

class WindowsFileLock : public FileLock {
 public: