Some time ago, I implemented a simple threaded notification queue by
following the example here:
http://developer.apple.com/documentation/Cocoa/Conceptual/Notifications/Articles/Threading.html
which basically adds an NSMachPort to the thread's runloop and calls -
[NSPort sendBeforeDate:components:from:reserved:] to wake the thread
up and allow it to process the enqueued notification. The same
technique has worked well for queuing invocations, also. I recently
noticed, however, that NSPort is explicitly listed as not being thread
safe:
http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/chapter_950_section_2.html#/
/apple_ref/doc/uid/10000057i-CH12-SW4
Does this apply to NSMachPort as well? I filed a doc bug hoping for
eventual clarification, but I'd rather know sooner rather than later
if the code has to be rewritten. rdar://problem/5772256
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