February 2007 - cells-devel - mailman3.common-lisp.net

[cells-devel] Get 1000's of Highly Targeted visitors to your web site or affiliate web site overnight
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27 Feb '07

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24 Feb '07

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[cells-devel] cells and cells-gtk
by Peter Denno 21 Feb '07

21 Feb '07

Hi ken, It has been a while (2006-06-07 to be exact) since I have updated the cells code in cells-gtk. Is there something in this new version, cells3, that would make an upgrade worthwhile? Bug fixes? -- Best regards, - Peter

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[Fwd: Re: [cells-devel] Cells and Threads]
by Ken Tilton 21 Feb '07

21 Feb '07

Duane Searsmith wrote: > Hi -- > > Quick question. I skimmed through the archives and didn't see any > obvious answer to this question. Is cells thread safe? If not, is > there a particular pattern of use that one can follow to avoid > problems in a multiprocess scenario? > > I have an application that is multithreaded and I would like to > explore how to use cells to drive the dataflow. I've read through the > examples and looked over the code a bit. Seems like I could get in > trouble if multiple threads tried to change a cell with dependencies > at the same time. > > If this is a silly question and I have missed some obvious explanation > somewhere, please just point me in the right direction. Not at all, good question, I have been waiting for it. :) I am afraid I have never programmed a threaded application, so I do not know what to say. Can threads enqueue on some resource (in the case of Cells, that would be the "data pulse", just a sequential counter of state changes that drives data integrity)? That would do the trick (I think!), but then does that defeat the whole point of threads? If each thread operates on a discrete subset of the application universe, well, I /did/ start to mess with allowing such a beast to have its own pulse -- then we just have to figure out the boundary (assuming one wants at least /some/ dependency to reach thru the wormhole, if you will). Hmmm, I guess if you are worried about two threads setting the same input cell then clearly they can enqueue on some resource. I guess the next problem is if you want to have the Cells engine itself running in multiple threads, which could be tough. And in /my/ Cells apps, Cells tend to ineluctably take over the whole application, so if Cells runs in one thread only then again -- well, like I said, I have never programmed with threads. I guess I will leave the implications to you. Any help? ken

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[cells-devel] Cells and Threads
by Duane Searsmith 20 Feb '07

20 Feb '07

Hi -- Quick question. I skimmed through the archives and didn't see any obvious answer to this question. Is cells thread safe? If not, is there a particular pattern of use that one can follow to avoid problems in a multiprocess scenario? I have an application that is multithreaded and I would like to explore how to use cells to drive the dataflow. I've read through the examples and looked over the code a bit. Seems like I could get in trouble if multiple threads tried to change a cell with dependencies at the same time. If this is a silly question and I have missed some obvious explanation somewhere, please just point me in the right direction. Thanks, -- Duane

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