From f6de38fa5cc34461513670e52d5a9801ff8d8b32 Mon Sep 17 00:00:00 2001
From: rowanbeentje <rowan@beent.je>
Date: Sun, 18 Mar 2012 00:51:52 +0000
Subject:  - Fix crashes caused by the database structure retrieval continuing
 briefly after the parent document was closed

---
 Source/SPDatabaseDocument.m  |  1 +
 Source/SPDatabaseStructure.h |  3 ++-
 Source/SPDatabaseStructure.m | 15 ++++++++++++---
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/Source/SPDatabaseDocument.m b/Source/SPDatabaseDocument.m
index cff43d9b..7fd93c1b 100644
--- a/Source/SPDatabaseDocument.m
+++ b/Source/SPDatabaseDocument.m
@@ -5647,6 +5647,7 @@ static NSString *SPCreateSyntx = @"SPCreateSyntax";
 
 #endif
 
+	[databaseStructureRetrieval destroy];
 	[databaseStructureRetrieval release];
 
 	[allDatabases release];
diff --git a/Source/SPDatabaseStructure.h b/Source/SPDatabaseStructure.h
index 2b2d6977..52e43ec8 100644
--- a/Source/SPDatabaseStructure.h
+++ b/Source/SPDatabaseStructure.h
@@ -39,9 +39,10 @@
 	pthread_mutex_t connectionCheckLock;
 }
 
-// Setup
+// Setup and teardown
 - (id)initWithDelegate:(SPDatabaseDocument *)theDelegate;
 - (void)setConnectionToClone:(SPMySQLConnection *)aConnection;
+- (void)destroy;
 
 // Information
 - (SPMySQLConnection *)connection;
diff --git a/Source/SPDatabaseStructure.m b/Source/SPDatabaseStructure.m
index 42896b55..3579e269 100644
--- a/Source/SPDatabaseStructure.m
+++ b/Source/SPDatabaseStructure.m
@@ -95,8 +95,12 @@
 	[NSThread detachNewThreadSelector:@selector(_cloneConnectionFromConnection:) toTarget:self withObject:aConnection];
 }
 
-- (void)dealloc
+/**
+ * Ensure that processing is completed.
+ */
+- (void)destroy
 {
+	delegate = nil;
 
 	// Ensure all the retrieval threads have ended
 	pthread_mutex_lock(&threadManagementLock);
@@ -111,12 +115,17 @@
 		}
 	}
 	pthread_mutex_unlock(&threadManagementLock);
+
+}
+
+- (void)dealloc
+{
+	[self destroy];
 	[structureRetrievalThreads release];
 
 	pthread_mutex_destroy(&threadManagementLock);
 	pthread_mutex_destroy(&dataLock);
 	pthread_mutex_destroy(&connectionCheckLock);
-	delegate = nil;
 
 	if (mySQLConnection) [mySQLConnection release], mySQLConnection = nil;
 	if (structure) [structure release], structure = nil;
@@ -619,7 +628,7 @@
 
 - (BOOL)_ensureConnection
 {
-	if (!mySQLConnection) return NO;
+	if (!mySQLConnection || !delegate) return NO;
 
 	// Check the connection state
 	if ([mySQLConnection isConnected] && [mySQLConnection checkConnection]) return YES;
-- 
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