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Use signals for postmaster death on Linux.

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Linux provides a way to ask for a signal when your parent process dies.
Use that to make PostmasterIsAlive() very cheap.

Based on a suggestion from Andres Freund.

Author: Thomas Munro, Heikki Linnakangas
Reviewed-By: Michael Paquier
Discussion: https://postgr.es/m/7261eb39-0369-f2f4-1bb5-62f3b6083b5e%40iki.fi
Discussion: https://postgr.es/m/20180411002643.6buofht4ranhei7k%40alap3.anarazel.de
This commit is contained in:
Thomas Munro
2018-07-11 12:40:58 +12:00
parent 56a7147213
commit 9f09529952
8 changed files with 160 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/backend/storage/ipc/latch.c
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@ -1112,7 +1112,7 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
* WL_POSTMASTER_DEATH event would be painful. Re-checking doesn't
* cost much.
*/
if (!PostmasterIsAlive())
if (!PostmasterIsAliveInternal())
{
occurred_events->fd = PGINVALID_SOCKET;
occurred_events->events = WL_POSTMASTER_DEATH;
@ -1230,7 +1230,7 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
* WL_POSTMASTER_DEATH event would be painful. Re-checking doesn't
* cost much.
*/
if (!PostmasterIsAlive())
if (!PostmasterIsAliveInternal())
{
occurred_events->fd = PGINVALID_SOCKET;
occurred_events->events = WL_POSTMASTER_DEATH;
@ -1390,7 +1390,7 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
* even though there is no known reason to think that the event could
* be falsely set on Windows.
*/
if (!PostmasterIsAlive())
if (!PostmasterIsAliveInternal())
{
occurred_events->fd = PGINVALID_SOCKET;
occurred_events->events = WL_POSTMASTER_DEATH;