Patch: wake up duchainlock writers

[Hamish Rodda]

Hi,

I've made a patch to DUChainLock to enable it to wake up writers which have 
had to contend for a lock, rather than waiting for their usleep(10000) to end.  
This has the effect of making multiple parser threads more efficient than just 
one thread for the duchainify tool. (4 threads - 34.3s, 1 thread - 38.0s)  
This is pretty cool, because before, I found that using 4 threads actually 
added 10s.  mutrace shows that with this patch, lock contention becomes a much 
bigger issue, which is to be expected.

I'm posting here as I have not had sufficient time to test it with kdevelop, 
and also it seems slower (although not measured)... which is pretty weird.  
Any ideas? Post your experience with it...

Cheers,
Hamish.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: kdev-duchainlock-wakeupwriters.patch
Type: text/x-patch
Size: 3361 bytes
Desc: not available
URL: <http://mail.kde.org/pipermail/kdevelop-devel/attachments/20091215/5d575d30/attachment.patch>