pgsql: Fix some more bugs in signal handlers and process shutdown logic - Mailing list pgsql-committers

Fix some more bugs in signal handlers and process shutdown logic.

WalSndKill was doing things exactly backwards: it should first clear
MyWalSnd (to stop signal handlers from touching MyWalSnd->latch),
then disown the latch, and only then mark the WalSnd struct unused by
clearing its pid field.

Also, WalRcvSigUsr1Handler and worker_spi_sighup failed to preserve
errno, which is surely a requirement for any signal handler.

Per discussion of recent buildfarm failures.  Back-patch as far
as the relevant code exists.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/81b116d987a779de7c97f5fd415a7c8348b9afff

Modified Files
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src/backend/replication/walsender.c |   18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)