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NSStream blocking behavior?

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NSStream blocking behavior?

Subject: NSStream blocking behavior?
From: Michael Gardner <email@hidden>
Date: Wed, 7 May 2008 23:59:57 -0500

Are there any guarantees about blocking behavior for NSInputStream and NSOutputStream? For example, if I receive an NSStreamEventHasSpaceAvailable for an NSOutputStream, how many bytes can I write without blocking? It doesn't seem safe to do I/O in the main thread if there are no such guarantees, but the documentation on Cocoa streams is unsettlingly vague on this point.

-Michael
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