Measure WaitLatch's timeout parameter in milliseconds, not microseconds.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 74d099494c5853a44188316ba117a8909b299d40
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-08-09T22:52:35Z
Releases: 9.1.0
Measure WaitLatch's timeout parameter in milliseconds, not microseconds.

The original definition had the problem that timeouts exceeding about 2100
seconds couldn't be specified on 32-bit machines.  Milliseconds seem like
sufficient resolution, and finer grain than that would be fantasy anyway
on many platforms.

Back-patch to 9.1 so that this aspect of the latch API won't change between
9.1 and later releases.

Peter Geoghegan

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