Drobe :: The archives
About Drobe | Contact | RSS | Twitter | Tech docs | Downloads | BBC Micro

Confirm comment report request

My copy of the PRMs says it's highly problematic to multi-task during printing. PRM 3-561

Multitasking is incompatible with the queueing mechanism used by the Printers application. If you call Wimp_Poll whilst printing, the printers application will assume that you have finished; if there is another job in the queue it will continue with that, which will obviously cause an immediate error. Future versions of RISC OS may address this problem.

It is difficult to arrange your printing such that you call Wimp_Poll sufficiently often to confer a useful degree of multitasking on the rest of the system, since you cannot predict for all classes of printer the size and complexity of rectangles that you will be asked to print. To do so properly, you need to use a timer.

You must select the previous print job before polling the Wimp, and reselect your own job on return.

In practice these problems are likely to outweigh any advantages conferred by multitasking. If you have any doubts as to whether or not you should multitask, WE RECOMMEND THAT YOU DON'T [my caps]

So where in the PRMs did you read the recommendation to poll?

 is a RISC OS UserIvanDobski on 31/5/09 12:59PM
[ Reply | Permalink | Report ]

Click on the button below to confirm you wish to flag up this comment to the website's administrators. Abuse of this service will be frowned upon and it should only be used to notify us of comments that are extremely distasteful, indecent or otherwise unlawful. If you disagree with an opinion expressed or fact stated in a comment, please take part in the debate rather than expect it to be removed.

Return to the drobe.co.uk front page

Details

Reporting user / IP: / 54.166.245.10
Comment GID: 31156
Timestamp: Sat, 21 Oct 2017 03:07:52 +0000

Search the archives

Today's featured article

  • Archive magazine reviewed
    A media watch special
     10 comments, latest by diomus on 27/10/07 12:01PM. Published: 23 Oct 2007

  • Random article

  • Drobe talks to the organisers of Codecraft #3: Let's talk graphics

     25 comments, latest by piemmm on 11/3/04 2:07PM. Published: 31 Jan 2001

  • Useful links

    News and media:
    IconbarMyRISCOSArcSiteRISCOScodeANSC.S.A.AnnounceArchiveQercusRiscWorldDrag'n'DropGAG-News

    Top developers:
    RISCOS LtdRISC OS OpenMW SoftwareR-CompAdvantage SixVirtualAcorn

    Dealers:
    CJE MicrosAPDLCastlea4X-AmpleLiquid SiliconWebmonster

    Usergroups:
    WROCCRONENKACCIRUGSASAUGROUGOLRONWUGMUGWAUGGAGRISCOS.be

    Useful:
    RISCOS.org.ukRISCOS.orgRISCOS.infoFilebaseChris Why's Acorn/RISC OS collectionNetSurf

    Non-RISC OS:
    The RegisterThe InquirerApple InsiderBBC NewsSky NewsGoogle Newsxkcddiodesign


    © 1999-2009 The Drobe Team. Some rights reserved, click here for more information
    Powered by MiniDrobeCMS, based on J4U | Statistics
    "It gives a bad impression to anyone wondering who's going to be next to go when the web sites reporting the news have stopped reporting anything"
    Page generated in 0.0596 seconds.