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

[Günther Schmidt]

Hi,

I put in on hpaste:

http://hpaste.org/13264

slightly simplified

Günther

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
>