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Use a long lived WaitEventSet for WaitLatch().

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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
This commit is contained in:
Thomas Munro
2020-07-30 17:08:11 +12:00
parent d6c08e29e7
commit 3347c982ba
4 changed files with 67 additions and 16 deletions
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2
src/backend/utils/init/miscinit.c
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@ -120,6 +120,7 @@ InitPostmasterChild(void)
InitializeLatchSupport();
MyLatch = &LocalLatchData;
InitLatch(MyLatch);
InitializeLatchWaitSet();
/*
* If possible, make this process a group leader, so that the postmaster
@ -152,6 +153,7 @@ InitStandaloneProcess(const char *argv0)
InitializeLatchSupport();
MyLatch = &LocalLatchData;
InitLatch(MyLatch);
InitializeLatchWaitSet();
/* Compute paths, no postmaster to inherit from */
if (my_exec_path[0] == '\0')