and data is now buffered for sending and the application calls PR_Poll
to poll on read, poll on write also. This way, if the socket becomes
writable, the application's read attempt will send (more of) the buffered
write data.
git-svn-id: svn://10.0.0.236/trunk@95409 18797224-902f-48f8-a5cc-f745e15eee43