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Code Issues

Fixed bug CORE-4575 : AV in garbage collector thread at disconnect of last attachment

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This commit is contained in:
hvlad 2014-10-10 10:11:14 +00:00
parent fd924ee3c7
commit 18806682fd
2 changed files with 20 additions and 9 deletions
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2
src/jrd/Database.h
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@ -208,7 +208,7 @@ const ULONG DBB_read_only = 0x200L; // DB is ReadOnly (RO). If not set, DB i
const ULONG DBB_being_opened_read_only = 0x400L; // DB is being opened RO. If unset, opened as RW
const ULONG DBB_no_ast = 0x800L; // AST delivery is prohibited
const ULONG DBB_sweep_in_progress = 0x1000L; // A database sweep operation is in progress
const ULONG DBB_security_db = 0x2000L; // ISC security database
const ULONG DBB_gc_starting = 0x2000L; // garbage collector thread is starting
const ULONG DBB_suspend_bgio = 0x4000L; // Suspend I/O by background threads
const ULONG DBB_new = 0x8000L; // Database object is just created
const ULONG DBB_gc_cooperative = 0x10000L; // cooperative garbage collection

27
src/jrd/vio.cpp
View File

@ -2302,16 +2302,26 @@ void VIO_init(thread_db* tdbb)
if (!(dbb->dbb_flags & DBB_garbage_collector))
{
try
const ULONG old = dbb->dbb_flags.exchangeBitOr(DBB_gc_starting);
if (!(old & DBB_gc_starting))
{
Thread::start(garbage_collector, dbb, THREAD_medium);
}
catch (const Exception&)
{
ERR_bugcheck_msg("cannot start garbage collector thread");
}
if (old & DBB_garbage_collector)
dbb->dbb_flags &= ~DBB_gc_starting;
else
{
try
{
Thread::start(garbage_collector, dbb, THREAD_medium);
}
catch (const Exception&)
{
dbb->dbb_flags &= ~DBB_gc_starting;
ERR_bugcheck_msg("cannot start garbage collector thread");
}
dbb->dbb_gc_init.enter();
dbb->dbb_gc_init.enter();
}
}
}
// Database backups and sweeps perform their own garbage collection
@ -4531,6 +4541,7 @@ static THREAD_ENTRY_DECLARE garbage_collector(THREAD_ENTRY_PARAM arg)
// Notify our creator that we have started
dbb->dbb_flags |= DBB_garbage_collector;
dbb->dbb_flags &= ~DBB_gc_starting;
dbb->dbb_gc_init.release();
// The garbage collector flag is cleared to request the thread