On Mon, Dec 13, 2010 at 5:48 AM, aaliya zarrin <aaliya.zar...@gmail.com> wrote: > drainSelfPipe() function will read the data and remove it from the > descriptor?
Yes... > Coz the signal (SIGUSR1) is writing sata to selfPipe descriptor but unable > to wake up latch on select system call. The signal won't cause the select() to return, but the byte that the signal handler writes to the self-pipe ought to make it return. > Data is not avaialable at select in WaitLatch fun. Coz it is read by > drailSelfPipe(). I'm not sure what you're talking about here. drainSelfPipe() is called before calling SELECT. As soon as a self-pipe byte is written, the SELECT will return. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
