Some background:
1. This is a thread pool, but it's system-wide. The kernel knows best (how
to allocate threads), so it is in control.
2. It's lower-level than Cocoa / OpenStep. It is not related to them and it
does not require them. A unix app written for the K Desktop Environment
could be written to use Grand Central Dispatch.
3. It requires Blocks. This means you must use LLVM and C, Obj-C, or C++.
4. It's very easy to use. The following is an example from Ars Technica's
explanation. The `dispatch` lines instruct GCD to create a task (containing
another task) that will be assigned to a thread.
- (IBAction)analyzeDocument:(NSButton *)sender
{
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSDictionary *stats = [myDoc analyze];
dispatch_async(dispatch_get_main_queue(), ^{
[myModel setDict:stats];
[myStatsView setNeedsDisplay:YES];
[stats release];
});
});
}
--Tycho Martin Clendenny
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