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PONSDocument saveDocumentWithDelegate deadlocked during App termination
 

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  1. PONSDocument saveDocumentWithDelegate deadlocked during App termination
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    <p>NSDocument continues to be a software maintenance nightmare.</p> <p>Anyone else having a problem where they want certain blocking dialogs to be handled SYNCHRONOUSLY?</p> <h2>BEGIN EDIT: I <em>may</em> have found a solution that allows me to wait synchronously</h2> <p>Can anyone verify that this would be an "Apple approved" solution?</p> <pre><code>static BOOL sWaitingForDidSaveModally = NO; BOOL gWaitingForDidSaveCallback = NO; // NSDocument dialog calls didSave: when done ... gWaitingForDidSaveCallback = true; [toDocument saveDocumentWithDelegate:self didSaveSelector:@selector(document:didSave:contextInfo:) contextInfo:nil]; if ( gWaitingForDidSaveCallback ) { // first, dispatch any other potential alerts synchronously while ( gWaitingForDidSaveCallback &amp;&amp; [NSApp modalWindow] ) [NSApp runModalForWindow: [NSApp modalWindow]]; if ( gWaitingForDidSaveCallback ) { sWaitingForDidSaveModally = YES; [NSApp runModalForWindow: [NSApp mbWindow]]; // mbWindow is our big (singleton) window sWaitingForDidSaveModally = NO; } } ... - (void)document:(NSDocument *)doc didSave:(BOOL)didSave contextInfo:(void *)contextInfo { [self recordLastSaveURL]; gWaitingForDidSaveCallback = NO; if ( sWaitingForDidSaveModally ) [NSApp stopModal]; } </code></pre> <h2>END EDIT</h2> <p>I have to support Snow Leopard/Lion/ML</p> <p>App termination is an ugly process. When the user decides to quit, and the document has changes that need saving, I call this:</p> <pre><code> gWaitingForDidSaveCallback = true; [toDocument saveDocumentWithDelegate:self didSaveSelector:@selector(document:didSave:contextInfo:) contextInfo:nil]; </code></pre> <p>I <em>really really really</em> want this call to be synchronous, but in latest Lion, this hangs my app: </p> <pre><code> while ( gWaitingForDidSaveCallback ) { // didSave: callback clears sWaitingForDidSaveCallback // do my own synchronous wait for now [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceReferenceDate:0.05]]; } </code></pre> <p>My best guess for the hang is that the mouseDown: of a window close button is confusing the NSDocument.</p> <p>So now, I have to return, and pepper my apps main loop with unmaintainable state machine logic to prevent user from executing various dangerous hotkeys.</p> <p>Ok, so I grin and bear it, and run into yet another roadblock!</p> <p>In previous OS versions/SDKs, [NSApp modalWindow] would return a window when it was in this state. Now it doesn't! Grrrrr...<br> NSDocument has no API to test when it is in this state!</p> <p>So, now there is no mechanism to globally check this state! I have to add yet another state variable to my state machine.</p> <p>Anyone have a cleaner solution for this problem that works in all OS versions and all present (and future) SDKs?</p>
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    1. USKeith Knauber
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