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Code Issues

Backport more complete fix for bug CORE-2993 : Fatal lock manager error "Invalid lock id (NNN)" while working with monitoring tables on a highly loaded system

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This commit is contained in:
hvlad 2010-08-01 20:42:43 +00:00
parent 58b518a2b9
commit e8a75e91f7
3 changed files with 24 additions and 10 deletions
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10
src/jrd/DatabaseSnapshot.cpp
View File

@ -403,6 +403,8 @@ int DatabaseSnapshot::blockingAst(void* ast_object)
if (!(dbb->dbb_ast_flags & DBB_monitor_off))
{
// Write the data to the shared memory
if (!(dbb->dbb_flags & DBB_not_in_use))
{
try
{
dumpData(tdbb, true);
@ -413,9 +415,15 @@ int DatabaseSnapshot::blockingAst(void* ast_object)
ex.stuff_exception(status);
gds__log_status("Cannot dump the monitoring data", status);
}
}
// Release the lock and mark dbb as requesting a new one
// Release the lock, if feasible
if (!(dbb->dbb_flags & DBB_monitor_locking))
{
LCK_release(tdbb, lock);
}
// Mark dbb as requesting a new lock
dbb->dbb_ast_flags |= DBB_monitor_off;
}

4
src/jrd/jrd.cpp
View File

@ -4692,7 +4692,9 @@ bool JRD_reschedule(thread_db* tdbb, SLONG quantum, bool punt)
if (dbb->dbb_ast_flags & DBB_monitor_off)
{
dbb->dbb_ast_flags &= ~DBB_monitor_off;
dbb->dbb_flags |= DBB_monitor_locking;
LCK_lock(tdbb, dbb->dbb_monitor_lock, LCK_SR, LCK_WAIT);
dbb->dbb_flags &= ~DBB_monitor_locking;
// While waiting for return from LCK_lock call above the blocking AST (see
// DatabaseSnapshot::blockingAst) was called and set DBB_monitor_off flag
@ -5029,7 +5031,9 @@ static ISC_STATUS check_database(thread_db* tdbb, Attachment* attachment, ISC_ST
if (dbb->dbb_ast_flags & DBB_monitor_off)
{
dbb->dbb_ast_flags &= ~DBB_monitor_off;
dbb->dbb_flags |= DBB_monitor_locking;
LCK_lock(tdbb, dbb->dbb_monitor_lock, LCK_SR, LCK_WAIT);
dbb->dbb_flags &= ~DBB_monitor_locking;
if (dbb->dbb_ast_flags & DBB_monitor_off)
LCK_release(tdbb, dbb->dbb_monitor_lock);

2
src/jrd/jrd.h
View File

@ -389,6 +389,8 @@ const ULONG DBB_gc_background = 0x1000000L; // background garbage collection by
#if (defined DEV_BUILD && !defined MULTI_THREAD)
const ULONG DBB_exec_statement = 0x2000000L; // execute statement runs against database
#endif
const ULONG DBB_monitor_locking = 0x4000000L; // monitoring lock is being acquired
//
// dbb_ast_flags
//