[Haskell-cafe] Re: Threads with high CPU usage

Günther Schmidt redcom at fedoms.com
Mon Dec 22 16:55:03 EST 2008


I put in on hpaste:


slightly simplified


Am 22.12.2008, 22:36 Uhr, schrieb Duncan Coutts  
<duncan.coutts at worc.ox.ac.uk>:

> On Mon, 2008-12-22 at 22:12 +0100, Günther Schmidt wrote:
>> Hi guys,
>> I just tried to forkIO-off the database code to keep the UI responsive
>> using Takusen with Sqlite this time.
>> The problem persists though, the UI freezes.
> You might need to provide us more details on the GUI code. As I
> understand if you're using gtk2hs. You need to make sure that you're not
> blocking the GUI event loop by making blocking calls in event handlers.
> All blocking stuff has to be run via forkIO and the event handler must
> be allowed to return so that Gtk+ can redraw windows etc.
> In this context, by "blocking" I mean blocking a single Haskell thread,
> which is of course different from the safe/unsafe foreign calls which
> blocks a whole OS thread and thus all the Haskell threads.
> Duncan

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