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Add hooks for session start and session end, take two

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These hooks can be used in loadable modules.  A simple test module is
included.

The first attempt was done with cd8ce3a but we lacked handling for
NO_INSTALLCHECK in the MSVC scripts (problem solved afterwards by
431f1599) so the buildfarm got angry.  This also fixes a couple of
issues noticed upon review compared to the first attempt, so the code
has slightly changed, resulting in a more simple test module.

Author: Fabrízio de Royes Mello, Yugo Nagata
Reviewed-by: Andrew Dunstan, Michael Paquier, Aleksandr Parfenov
Discussion: https://postgr.es/m/20170720204733.40f2b7eb.nagata@sraoss.co.jp
Discussion: https://postgr.es/m/20190823042602.GB5275@paquier.xyz
This commit is contained in:
Michael Paquier
2019-10-01 12:15:25 +09:00
parent 41a6de41ed
commit e788bd924c
11 changed files with 262 additions and 0 deletions
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6
src/backend/utils/init/postinit.c
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@ -78,6 +78,8 @@ static bool ThereIsAtLeastOneRole(void);
static void process_startup_options(Port *port, bool am_superuser);
static void process_settings(Oid databaseid, Oid roleid);
/* Hook for plugins to get control at end of session */
session_end_hook_type session_end_hook = NULL;
/*** InitPostgres support ***/
@ -1195,6 +1197,10 @@ ShutdownPostgres(int code, Datum arg)
* them explicitly.
*/
LockReleaseAll(USER_LOCKMETHOD, true);
/* Hook at session end */
if (session_end_hook)
(*session_end_hook) ();
}