From 2ad5c27bb565c26a4b12ea3343331c80f121f269 Mon Sep 17 00:00:00 2001
From: Robert Haas
Date: Fri, 16 Oct 2015 09:42:33 -0400
Subject: Don't send protocol messages to a shm_mq that no longer exists.

Commit 2bd9e412f92bc6a68f3e8bcb18e04955cc35001d introduced a mechanism
for relaying protocol messages from a background worker to another
backend via a shm_mq.  However, there was no provision for shutting
down the communication channel.  Therefore, a protocol message sent
late in the shutdown sequence, such as a DEBUG message resulting from
cranking up log_min_messages, could crash the server.  To fix, install
an on_dsm_detach callback that disables sending messages to the shm_mq
when the associated DSM is detached.
---
 src/include/libpq/pqmq.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/include/libpq')

diff --git a/src/include/libpq/pqmq.h b/src/include/libpq/pqmq.h
index 901756596a4..97f17da89db 100644
--- a/src/include/libpq/pqmq.h
+++ b/src/include/libpq/pqmq.h
@@ -16,7 +16,7 @@
 #include "lib/stringinfo.h"
 #include "storage/shm_mq.h"
 
-extern void pq_redirect_to_shm_mq(shm_mq *, shm_mq_handle *);
+extern void pq_redirect_to_shm_mq(dsm_segment *seg, shm_mq_handle *mqh);
 extern void pq_set_parallel_master(pid_t pid, BackendId backend_id);
 
 extern void pq_parse_errornotice(StringInfo str, ErrorData *edata);
-- 
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