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Add wrapper function libpqrcv_PQexec() in the walreceiver that uses async

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libpq to send queries, making the waiting for responses interruptible on
platforms where PQexec() can't normally be interrupted by signals, such
as win32.

Fujii Masao and Magnus Hagander
This commit is contained in:
Magnus Hagander
2010-04-19 14:10:45 +00:00
parent 5b89ef384c
commit 03a571a4cf
2 changed files with 88 additions and 6 deletions
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6
src/backend/replication/walreceiver.c
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@@ -29,7 +29,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/replication/walreceiver.c,v 1.8 2010/04/13 08:16:09 mha Exp $
* $PostgreSQL: pgsql/src/backend/replication/walreceiver.c,v 1.9 2010/04/19 14:10:45 mha Exp $
*
*-------------------------------------------------------------------------
*/
@@ -86,8 +86,8 @@ static void DisableWalRcvImmediateExit(void);
* We can't just exit(1) within SIGTERM signal handler, because the signal
* might arrive in the middle of some critical operation, like while we're
* holding a spinlock. We also can't just set a flag in signal handler and
* check it in the main loop, because we perform some blocking libpq
* operations like PQexec(), which can take a long time to finish.
* check it in the main loop, because we perform some blocking operations
* like libpqrcv_PQexec(), which can take a long time to finish.
*
* We use a combined approach: When WalRcvImmediateInterruptOK is true, it's
* safe for the signal handler to elog(FATAL) immediately. Otherwise it just