AvailableBytes
size_t writable = locker.AvailableBytes();
writable = locker.AvailableBytes();
size_t writable = locker.AvailableBytes();
writable = locker.AvailableBytes();
size_t toRead = locker.AvailableBytes();
toRead = readLocker.AvailableBytes();
toRead = readLocker.AvailableBytes();