Tom Lane 7753ca49d3 In the postmaster, rely on the signal infrastructure to block signals. ... POSIX sigaction(2) can be told to block a set of signals while a signal handler executes. Make use of that instead of manually blocking and unblocking signals in the postmaster's signal handlers. This should save a few cycles, but more importantly it prevents recursive invocation of signal handlers when many signals arrive in close succession. (Assuming that the platform's signal infrastructure is designed to avoid consuming stack space in that case, but this is demonstrably true at least on Linux.) The existing code has been seen to recurse to the point of stack overflow, either in the postmaster or in a forked-off child. Back-patch of commit 9abb2bfc0. At the time, we'd only seen excess postmaster stack consumption in the buildfarm; but we now have a user report of it, and that commit has aged enough to have a fair amount of confidence that it doesn't break anything. This still doesn't change anything about the way that it works on Windows. Perhaps someone else would like to fix that? Per bug #16673 from David Geier. Back-patch to 9.6. Although the problem exists in principle before that, we've only seen it actually materialize in connection with heavy use of parallel workers, so it doesn't seem necessary to do anything in 9.5; and the relevant code is different there, too. Discussion: https://postgr.es/m/16673-d278c604f8e34ec0@postgresql.org Discussion: https://postgr.es/m/14878.1570820201@sss.pgh.pa.us		2020-10-15 12:50:57 -04:00
..
auth.h	Update copyright for 2016	2016-01-02 13:33:40 -05:00
be-fsstubs.h	Update copyright for 2016	2016-01-02 13:33:40 -05:00
crypt.h	Update copyright for 2016	2016-01-02 13:33:40 -05:00
hba.h	Add authentication parameters compat_realm and upn_usename for SSPI	2016-04-08 20:28:38 +02:00
ip.h	Update copyright for 2016	2016-01-02 13:33:40 -05:00
libpq-be.h	Fix postmaster's behavior during smart shutdown.	2020-08-14 13:26:57 -04:00
libpq-fs.h	Update copyright for 2016	2016-01-02 13:33:40 -05:00
libpq.h	Fix pq_putmessage_noblock() to not block.	2016-07-29 12:52:57 -04:00
md5.h	Fix detection of passwords hashed with MD5	2019-04-24 09:05:25 +09:00
pqcomm.h	Give nicer error message when connecting to a v10 server requiring SCRAM.	2017-05-05 11:24:02 +03:00
pqformat.h	Fix several mistakes around parallel workers and client_encoding.	2016-06-30 18:35:32 -04:00
pqmq.h	Update copyright for 2016	2016-01-02 13:33:40 -05:00
pqsignal.h	In the postmaster, rely on the signal infrastructure to block signals.	2020-10-15 12:50:57 -04:00