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Partially deduplicate interrupt handling for background processes.

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Where possible, share signal handler code and main loop interrupt
checking. This saves quite a bit of code and should simplify
maintenance, too.

This commit intends not to change the way anything works, even
though that might allow more code to be unified. It does unify
a bunch of individual variables into a ShutdownRequestPending
flag that has is now used by a bunch of different process types,
though.

Patch by me, reviewed by Andres Freund and Daniel Gustafsson.

Discussion: http://postgr.es/m/CA+TgmoZwDk=BguVDVa+qdA6SBKef=PKbaKDQALTC_9qoz1mJqg@mail.gmail.com
This commit is contained in:
Robert Haas
2019-12-17 13:14:28 -05:00
parent 1e53fe0e70
commit 7dbfea3c45
18 changed files with 191 additions and 399 deletions
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3
src/backend/replication/logical/worker.c
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@ -45,6 +45,7 @@
#include "parser/parse_relation.h"
#include "pgstat.h"
#include "postmaster/bgworker.h"
#include "postmaster/interrupt.h"
#include "postmaster/postmaster.h"
#include "postmaster/walwriter.h"
#include "replication/decode.h"
@ -1575,7 +1576,7 @@ ApplyWorkerMain(Datum main_arg)
logicalrep_worker_attach(worker_slot);
/* Setup signal handling */
pqsignal(SIGHUP, PostgresSigHupHandler);
pqsignal(SIGHUP, SignalHandlerForConfigReload);
pqsignal(SIGTERM, die);
BackgroundWorkerUnblockSignals();