Horton

Use WaitLatch() for condition variables.

Thomas Munro <tmunro@postgresql.org>

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Commit: e2d394df5df28ab5ee4bfac6b13837e99e24045d
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2020-07-30T05:42:45Z
Releases: 14.0 
Use WaitLatch() for condition variables.

Previously, condition_variable.c created a long lived WaitEventSet to
avoid extra system calls.  WaitLatch() now uses something similar
internally, so there is no point in wasting an extra kernel descriptor.

Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/CA%2BhUKGJAC4Oqao%3DqforhNey20J8CiG2R%3DoBPqvfR0vOJrFysGw%40mail.gmail.com

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PathChange+/−
src/backend/storage/lmgr/condition_variable.c modified +5 −23

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