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Teach standby conflict resolution to use SIGUSR1

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Conflict reason is passed through directly to the backend, so we can
take decisions about the effect of the conflict based upon the local
state. No specific changes, as yet, though this prepares for later work.
CancelVirtualTransaction() sends signals while holding ProcArrayLock.
Introduce errdetail_abort() to give message detail explaining that the
abort was caused by conflict processing. Remove CONFLICT_MODE states
in favour of using PROCSIG_RECOVERY_CONFLICT states directly, for clarity.
This commit is contained in:
Simon Riggs
2010-01-16 10:05:59 +00:00
parent c9dc53be77
commit a8ce974cdd
11 changed files with 227 additions and 153 deletions
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4
src/include/tcop/tcopprot.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/tcop/tcopprot.h,v 1.102 2010/01/02 16:58:09 momjian Exp $
* $PostgreSQL: pgsql/src/include/tcop/tcopprot.h,v 1.103 2010/01/16 10:05:59 sriggs Exp $
*
* OLD COMMENTS
* This file was created so that other c files could get the two
@@ -21,6 +21,7 @@
#include "executor/execdesc.h"
#include "nodes/parsenodes.h"
#include "storage/procsignal.h"
#include "utils/guc.h"
@@ -64,6 +65,7 @@ extern void die(SIGNAL_ARGS);
extern void quickdie(SIGNAL_ARGS);
extern void StatementCancelHandler(SIGNAL_ARGS);
extern void FloatExceptionHandler(SIGNAL_ARGS);
extern void RecoveryConflictInterrupt(ProcSignalReason reason); /* called from SIGUSR1 handler */
extern void prepare_for_client_read(void);
extern void client_read_ended(void);
extern const char *process_postgres_switches(int argc, char *argv[],