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    <p>There's no direct support for that in GCD. You can probably get the effect you're looking for in other ways, though. </p> <ul> <li><p>Do you just want to run a block after other blocks have completed? Put the blocks in a <code>dispatch_group</code>, and submit your "after everything's done action" using <code>dispatch_group_notify</code>. This works with concurrent or sequential queues.</p></li> <li><p>Similarly, put your blocks in a group, and call <code>dispatch_group_wait(group, DISPATCH_TIME_NOW)</code>. If it returns non-zero, then there are outstanding blocks in the group.</p></li> <li><p>Is your queue sequential, and you want to wait until the other blocks have completed, blocking the current thread until then? Just issue your handler using <code>dispatch_sync</code> on the same queue.</p></li> </ul> <p>There are other possibilities, depending on your exact situation.</p> <p><strong>Edit:</strong> Based on your update, there's an even easier way:</p> <ul> <li>add a <code>BOOL</code> property to your view controller, called <code>allowsOrientationChange</code></li> <li>override <code>-shouldAutorotateToInterfaceOrientation:</code> to return <code>self.allowsOrientationChange</code></li> <li>at the start of your work block, do a <code>dispatch_async</code> to set the property to NO</li> <li>at the end of your work block, do a <code>dispatch_async</code> to set the property to YES</li> </ul> <p>(There's a little bit of a race condition between when the property is set to NO on the main thread, and when the rest of your work happens in the queue. You could make it a <code>dispatch_sync</code> if that really matters. Depends on what your reasons are for preventing rotation, I suppose.)</p>
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    1. POGrand Central Dispatch. How Do I Query a Queue to see if it is in use?
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    1. COyes. I like this approach very much. Thanks very much for this. Cheers.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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