Horton

Use a long lived WaitEventSet for WaitLatch().

Thomas Munro <tmunro@postgresql.org>

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Commit: 3347c982bab0dd56d5b6cb784521233ba2bbac27
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2020-07-30T05:40:00Z
Releases: 14.0 
Use a long lived WaitEventSet for WaitLatch().

Create LatchWaitSet at backend startup time, and use it to implement
WaitLatch().  This avoids repeated epoll/kqueue setup and teardown
system calls.

Reorder SubPostmasterMain() slightly so that we restore the postmaster
pipe and Windows signal emulation before we reach InitPostmasterChild(),
to make this work in EXEC_BACKEND builds.

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

Files

PathChange+/−
src/backend/postmaster/postmaster.c modified +12 −12
src/backend/storage/ipc/latch.c modified +52 −4
src/backend/utils/init/miscinit.c modified +2 −0
src/include/storage/latch.h modified +1 −0

Discussion