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

Reply to thread

"The CSD is a global, shared among all processes. Much like environment variables, the sprite context, the VDU pipeline, and dozens of other things."

This is true, and the reason most programs don't rely on them except, possibly, to assume that they won't change between calls to Poll. If each program had it's own CSD, sprite context, etc. they wouldn't see a difference. Environment variables are another case; they should be shared but it probably wouldn't break anything to allow changes between Poll calls, but if that turned out to be the case, the shared environment could be copied on each Poll.

A lot can be achieved by allowing programs that are aware of the multi-processing capability of the OS to carry on working while waiting for a poll response, while avoiding doing anything that would affect other, more traditional programs.

ROLF allows processes to detatch from the Wimp polling process and be signalled when an event that it should take care of has occurred, and also to keep working while waiting for the Wimp to re-introduce the process into the traditional CMT environment.

 is a RISC OS UserStoppers on 21/5/09 9:40PM
[ Reply | Permalink | Report ]

Please login before posting a comment. Use the form on the right to do so or create a free account.

Search the archives

Today's featured article

  • Being a DJ with RISC OS
    The people want entertaining. Jon Wright has the solution
     36 comments, latest by jonix on 25/11/03 10:42PM. Published: 22 Nov 2003

  • Random article

  • VirtualAcorn boasts 3000 users
    You win a gold star
     63 comments, latest by Gulli on 30/08/05 5:27PM. Published: 19 Aug 2005

  • 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
    "I'm not sure I could have trusted you six months ago"
    Page generated in 0.1494 seconds.