[Sqlrelay-discussion] One more fault tolerance patch

[Renat S. <sr...@st...>]

Hi David,

I am continue testing and generating ideas :)

If sqlr-connection is killed between signalListenerToRead() and 
waitForListenerToFinishReading(), sem(3) starts growing above one. This 
consequently breaks listener-connection communication and leads to 
hanging listener processes under high load.

The patch changes wait points for sem(3) and sem(2) so the values of 
this semaphores is set to 0 after wait() completed. Since we can not use 
"WithUndo" on inter-process communication semaphores, I suppose it is a 
good idea in general to check the state and revert it to normal.

-- 
Renat Sabitov   e-mail: sr...@st...
Stack Soft         jid: sr...@ja...