fWriterReaderCount
int32 fWriterReaderCount; // writer read lock owner
if (fWriterReaderCount > 0) {
_NewReadLockInfo(thread, fWriterReaderCount);
fReaderCount += fWriterReaderCount;
fWriterReaderCount = 0;
fWriterReaderCount++;
fWriterReaderCount = info->count;
fReaderCount -= fWriterReaderCount;
fWriterReaderCount = readerCount;
if (fWriterReaderCount > 0)
fWriterReaderCount--;