From 59f71a0d0b56b2df48db4bf1738aece5551f7a47 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Wed, 14 Jan 2015 18:45:22 +0100 Subject: Add a default local latch for use in signal handlers. To do so, move InitializeLatchSupport() into the new common process initialization functions, and add a new global variable MyLatch. MyLatch is usable as soon InitPostmasterChild() has been called (i.e. very early during startup). Initially it points to a process local latch that exists in all processes. InitProcess/InitAuxiliaryProcess then replaces that local latch with PGPROC->procLatch. During shutdown the reverse happens. This is primarily advantageous for two reasons: For one it simplifies dealing with the shared process latch, especially in signal handlers, because instead of having to check for MyProc, MyLatch can be used unconditionally. For another, a later patch that makes FEs/BE communication use latches, now can rely on the existence of a latch, even before having gone through InitProcess. Discussion: 20140927191243.GD5423@alap3.anarazel.de --- src/backend/utils/adt/misc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/backend/utils/adt/misc.c') diff --git a/src/backend/utils/adt/misc.c b/src/backend/utils/adt/misc.c index ed5a795bb0e..29f7c3badfd 100644 --- a/src/backend/utils/adt/misc.c +++ b/src/backend/utils/adt/misc.c @@ -413,10 +413,10 @@ pg_sleep(PG_FUNCTION_ARGS) else break; - (void) WaitLatch(&MyProc->procLatch, + (void) WaitLatch(MyLatch, WL_LATCH_SET | WL_TIMEOUT, delay_ms); - ResetLatch(&MyProc->procLatch); + ResetLatch(MyLatch); } PG_RETURN_VOID(); -- cgit v1.2.3