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In HS, Startup process sets SIGALRM when waiting for buffer pin. If

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woken by alarm we send SIGUSR1 to all backends requesting that they
check to see if they are blocking Startup process. If so, they throw
ERROR/FATAL as for other conflict resolutions. Deadlock stop gap
removed. max_standby_delay = -1 option removed to prevent deadlock.
This commit is contained in:
Simon Riggs
2010-01-23 16:37:12 +00:00
parent 4fa69e566c
commit 959ac58c04
16 changed files with 367 additions and 87 deletions
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3
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.123 2010/01/02 16:58:08 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.124 2010/01/23 16:37:12 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@@ -198,6 +198,7 @@ extern void LockBuffer(Buffer buffer, int mode);
extern bool ConditionalLockBuffer(Buffer buffer);
extern void LockBufferForCleanup(Buffer buffer);
extern bool ConditionalLockBufferForCleanup(Buffer buffer);
extern bool HoldingBufferPinThatDelaysRecovery(void);
extern void AbortBufferIO(void);