"Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
> A few thoughts on LWLock data structures...

> In lwlock.c we hold a list of lwlocks held:
> held_lwlocks[MAX_SIMUL_LWLOCKS]
> where
> #define MAX_SIMUL_LWLOCKS	100

> The code for LWLockRelease assumes that the last acquired lock will
> always be the first one to be released, and uses an O(N) loop to search
> for the lock to release.

> Setting MAX_SIMUL_LWLOCKS to this fairly high number doesn't seem to
> match the optimistic use of the O(N) algorithm.

So?  The search only examines the actually-in-use array entries.

			regards, tom lane

In response to

• LWLockRelease at 2005-02-03 06:10:41 from Simon Riggs

pgsql-hackers by date

Next:	From: Bruce Momjian	Date: 2005-02-03 14:42:18
	Subject: Re: libpq API incompatibility between 7.4 and 8.0
Previous:	From: Tom Lane	Date: 2005-02-03 14:31:24
	Subject: Re: LWLock cache line alignment