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    <p>You should not do IO on the main thread, your need to try to handle a run-loop is evident. Run-loops are tricky, especially since many events do not make the runloop call exit as expected <em>(Anything run on a timer for one, performing selectors just happens to be run on a timer)</em>. You could probably solve your problem by not waiting for <code>distantFuture</code>, but just for a few hundred milliseconds at a time.</p> <p>What you really want to to do is top run <code>my_connect()</code> in a background thread, and just wait for a condition. This code will be much easier to handle, look like less of a hack, and actually perform better.</p> <p>You can use an instance of <code>NSConditionLock</code> to implement the wait. It is not super obvious how to do this. But you can create a shared instance on <code>NSConditionLock</code> in the variable <code>condLock</code> like this:</p> <pre><code>condLock = [[NSConditionLock alloc] initWithCondition:0]; </code></pre> <p>And this is then how you would implement the waiting in <code>my_connect()</code>:</p> <pre><code>[condLock lockWhenCondition:1]; // Add code that needs to be thread safe here if you like. [condLock unlockWithCondition:0]; </code></pre> <p>And this is how you would signal the <code>NSConditionLock</code> that it is time to continue from you delegate method.</p> <pre><code>[condLock lock]; // More thread safe code here if you like [condLock unlockWithCondition:1]; </code></pre> <p>You could assign some constants to use instead of <code>0</code> and <code>1</code> explicitly, and have a quite nice solution.</p>
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    1. POobjC/C- combined: letting a C function wait till an objC-Delegate is finished
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    1. COthis is a totally overblown way to solve the OP's question which was not about threads but how to access an instance variable from a c function.
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    2. CO@jib: Nope it is not, my answer was actually not fleshed out enough. The problem is not the variable, but the run-loop hack. Waiting on the main-thread just never is a good idea.
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    3. CO@PeyloW: thank you very much for this suggestion. the problem is that I'm doing codeinjection via MobileSubstrate and connect() is done via the main thread (also the UI), so if I block connect entirely the AlertView won't show up :( (just to be sure I tried showing the AlertView in it's own thread and it didn't work)
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