Re: Threads and messages
Re: Threads and messages
- Subject: Re: Threads and messages
- From: Marco Binder <email@hidden>
- Date: Tue, 11 Mar 2003 15:28:31 +0100
Thanks for the pointer to performSelectorOnMainThread! I guess I bite
the bullet and make 10.2 a prerequisite. In my opinion, everyone should
own it anyways and its going to be a scientific app, so I hope 10.2 is
a good presumption.
Jeff, thanks for your additional suggestions. All of them sound very
reasonable and I m sure I ll apply them in one or the other project!
actually, I tried to do the GUI work in the secondary thread (right
now, its just reloading a NSTableView datasource and updating some
selection), but as I get more threads, the app used to crash with
signal 10 or 11, absolutely randomly. So I guess, I might want to
restrict the threaded work on ONLY the calculations.
Thanks,
Marco
Well, if you want an ugly hack you could use the
NSDistributedNotificationCenter but it is supposed to be slow since it
informs every thread in ever process on the machine what happened.
If your main thread can block while the others perform their
computation (probably not what you want) then it is pretty trivial to
synchronize with a NSLock.
If you only need 10.2 as a deployment platform you can look at the
method to post a notification on the main thread, it should do
exactly what you want.
Of course, you could also have the secondary threads perform the UI
update themselves before they die as long as you are careful.
Probably the best way, however, (if you need 10.1, that is) is to use
a NSMessagePort or something similar. I found that approach works
pretty well, personally, and it isn't as big as full-blown DO.
Hope that helps,
Jeff.
On Tuesday, March 11, 2003, at 08:36 AM, Marco Binder wrote:
I have a couple of computational threads, that dont need to talk to
the
main thread. But: they should really inform the main threrad, when
they
are done and will exit. Is there another way of doing so rather than
using DO?
If the main thread registers for the threads notifications, the docs
say, the notification will be processed from within the exiting
thread-
thats not what I want since I d have to do some GUI element update...
Marco
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Jeff Disher
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Spectral Class: Shedding Light on Innovation
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| \/ | Telefon: 07531 / 94 19 94 Fax: 07531 / 94 19 92
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BINDER _____________________________________________________
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