From 7db6c4e18fb52c2e5ada02ad108ab6415a49843d Mon Sep 17 00:00:00 2001
From: rowanbeentje <rowan@beent.je>
Date: Sun, 1 Nov 2009 23:54:10 +0000
Subject:  - Tweak connection locking to avoid occasional NSLock warnings when
 running custom queries  - Add error connection to query reselection to avoid
 exceptions when editing queries while running them

---
 Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m | 22 +++++++++-------------
 Source/CustomQuery.m                               | 21 +++++++++++++--------
 2 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m b/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m
index 4e6e0ada..dd830e02 100644
--- a/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m
+++ b/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m
@@ -1352,14 +1352,8 @@ void performThreadedKeepAlive(void *ptr)
 			}
 		}
 		
-		// Lock on this thread for normal result sets...
-		if (streamResultType == MCP_NO_STREAMING) {
-			[queryLock lock];
-
-		// ...but streaming result unlock on the main thread after processing, so ensure a lock on the main thread.
-		} else {
-			[self lockConnection];
-		}
+		// Lock the connection
+		[self lockConnection];
 
 		// Run (or re-run) the query, timing the execution time of the query - note
 		// that this time will include network lag.
@@ -1378,7 +1372,7 @@ void performThreadedKeepAlive(void *ptr)
 				// For normal result sets, fetch the results and unlock the connection
 				if (streamResultType == MCP_NO_STREAMING) {
 					theResult = [[MCPResult alloc] initWithMySQLPtr:mConnection encoding:mEncoding timeZone:mTimeZone];
-					[queryLock unlock];
+					[self unlockConnection];
 				
 				// For streaming result sets, fetch the result pointer and leave the connection locked
 				} else if (streamResultType == MCP_FAST_STREAMING) {
@@ -1394,7 +1388,7 @@ void performThreadedKeepAlive(void *ptr)
 					break;
 				}
 			} else {
-				[queryLock unlock];
+				[self unlockConnection];
 			}
 			
 			queryErrorMessage = [[NSString alloc] initWithString:@""];
@@ -1405,7 +1399,7 @@ void performThreadedKeepAlive(void *ptr)
 			
 		// On failure, set the error messages and IDs
 		} else {
-			[queryLock unlock];
+			[self unlockConnection];
 			
 			queryErrorMessage = [[NSString alloc] initWithString:[self stringWithCString:mysql_error(mConnection)]];
 			queryErrorId = mysql_errno(mConnection);
@@ -1487,7 +1481,8 @@ void performThreadedKeepAlive(void *ptr)
 #pragma mark Connection locking
 
 /**
- * Lock the connection from any thread
+ * Lock the connection from any thread; ensure the the connection is locked on
+ * the main thread, but as fast as possible.
  */
 - (void)lockConnection
 {
@@ -1496,7 +1491,8 @@ void performThreadedKeepAlive(void *ptr)
 }
 
 /**
- * Unlock the connection from any thread
+ * Unlock the connection from any thread; ensure the connection is unlocked on
+ * the main thread, but as fast as possible.
  */
 - (void)unlockConnection
 {
diff --git a/Source/CustomQuery.m b/Source/CustomQuery.m
index b9896a28..25c90dba 100644
--- a/Source/CustomQuery.m
+++ b/Source/CustomQuery.m
@@ -81,15 +81,20 @@
 - (void) runAllQueriesCallback
 {
 
-	// If no error was selected reconstruct a given selection
-	if([textView selectedRange].length == 0)
-		[textView setSelectedRange:oldThreadedQueryRange];
+	// If no error was selected, reconstruct a given selection.  This
+	// may no longer be valid if the query text has changed in the
+	// meantime, so error-checking is required.
+	if (oldThreadedQueryRange.location + oldThreadedQueryRange.length <= [[textView string] length]) {
 
-	// Invoke textStorageDidProcessEditing: for syntax highlighting and auto-uppercase
-	NSRange oldRange = [textView selectedRange];
-	[textView setSelectedRange:NSMakeRange(oldThreadedQueryRange.location,0)];
-	[textView insertText:@""];
-	[textView setSelectedRange:oldRange];
+		if ([textView selectedRange].length == 0)
+			[textView setSelectedRange:oldThreadedQueryRange];
+
+		// Invoke textStorageDidProcessEditing: for syntax highlighting and auto-uppercase
+		NSRange oldRange = [textView selectedRange];
+		[textView setSelectedRange:NSMakeRange(oldThreadedQueryRange.location,0)];
+		[textView insertText:@""];
+		[textView setSelectedRange:oldRange];
+	}
 }
 
 /*
-- 
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