Are you running it on a multicore machine or single core? That radically changes things. I was having the same problem. To test I ran 500 threads or so a third of them were producers. My suspicion was that I wasn't enforcing the proper memory barriers because for x86 I had to write my own CAS in assembly. On Thu, Apr 17, 2008 at 3:23 PM, Michael Dickey <mike@mikedickey.com> wrote:
I wrote a C++ lock free queue implementation recently based on the Michael & Scott algorithm, that uses APR's atomics. It's available at:
http://svn.atomiclabs.com/pion-common/trunk/common/include/pion/PionLockFree...
You're welcome to use it but you should be aware that it's not quite debugged yet. It has issues when I tried using more than 1 producer and 1 consumer thread. I wasn't sure if this was a mistake I made in the code, or a limitation of the algorithm, but I assume it's the former. Anyway, in the end I decided not to use the code for what I was working on... But if you can find and fix the bug, it's all yours! =)
Of course, it depends on APR's atomics.. Boost does not have any compare-and-swap abstraction as I far as I know, which seems to be a basic requirement for any lock-free programming. Or maybe it does and I just don't know?
Take care, -Mike
On Apr 17, 2008, at 12:57 PM, Cory Nelson wrote:
On Wed, Apr 16, 2008 at 9:58 PM, Patrick Twohig <p-twohig@ieee.org> wrote:
I've been looking through the docs and I was wondering if boost has any lock-free threadsafe containers. I know it's been brought up on the list before, but I was curious if anybody had a working implementation. If somebody is working on them, I'd like to lend a hand if possible.
I have some lock-free stack/queue code for x86/x64/ia64 in c++. It only works with vc++ 2008 intrinsics right now, and the x64 version is dependant on the windows memory manager if used on older CPUs. If people are interested in boostifying and porting it, I suppose we could do that. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
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