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Re: [NSImage lockFocus] and threads

Subject: Re: [NSImage lockFocus] and threads
From: Aki Inoue <email@hidden>
Date: Fri, 20 Jul 2001 23:50:27 -0700

Brendan,

As I said in the other mail, NSView maintains the focus stack for each thread individually. You can lockFocus/unlockFocus safely from multiple threads. Furthermore, while the main thread is processing -display method, lockFocus in subthreads is blocked. Interaction between your own threads is your responsibility, though.

Aki

On 2001.07.20, at 23:35, Brendan Younger wrote:

From what I hear, this is may or may not be a good thing. The view maintains a queue of lock/unlock calls so you can lock it as many times as you want in one thread, but I'm a bit nervous about the situation where one thread is interrupted inside a drawing call with an -unlockFocus call from the secondary thread. May I suggest that simply from a conceptual point of view, no two threads should ever share a view. For safety's sake, I suggest either putting a healthy number of locks around the view or simply not share it between threads.

Brendan Younger
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References:
	>Re: [NSImage lockFocus] and threads (From: Brendan Younger <email@hidden>)

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