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    <p>libdispatch does not require calling <code>dispatch_main()</code>, it integrates with the main thread's runloop through the dispatch main queue, see <code>dispatch_get_main_queue(3)</code> and the <code>COMPATIBILITY</code> section therein.</p> <p>Executables that do not call <code>dispatch_main()</code> and want to use the main queue must run the main thread runloop in one of the common modes for blocks on the dispatch main queue to be processed; either indirectly via standard framework methods (e.g. <code>NSApplicationMain()</code>) or directly via CFRunLoop or NSRunLoop APIs.</p> <p>Please do not attempt to use the <code>_dispatch_main_queue_callback_4CF</code> symbol, it is an implementation detail internal to the library that is very likely to change in the future and any code that relies on it will break without warning.</p> <p>Integration of libdispatch with custom non-main-thread CFRunLoops can be achieved in a number of ways, such as via the <code>CFRunLoopPerformBlock()</code> API or custom runloop sources.</p> <hr> <p><strong>Update:</strong> on Linux, you'll have to modify the libdispatch sources, there is no existing support for interoperating with custom runloops AFAIK.</p> <p>The simplest way to integrate the main queue with an existing runloop on Linux is probably indeed going to be to call the (preferably renamed) <code>_dispatch_main_queue_callback_4CF()</code> function each time through the event loop, and replace <code>_dispatch_queue_wakeup_main()</code> with whatever method is appropriate to wake your runloop (e.g. write to a pipe the runloop is waiting on).</p>
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    1. COI am trying to use libdispatch on a Linux system (ergo the NSRunLoop/CFRunLoop restriction). I guess I should have been clearer about that in my original post. I am using the Debian libdispatch sources for the same (libkern/libpthread_workqueue/libkqueue).
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    2. COThat is exactly correct. I just arrived at a similar solution myself. Thanks a ton!
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