Article View: borland.public.cppbuilder.nativeapi
Article #7566Re: Accessing same variable from multiple threads
From: Bob Gonder
Date: Thu, 20 Jan 2005 03:58
Date: Thu, 20 Jan 2005 03:58
17 lines
1971 bytes
1971 bytes
Alan Bellingham wrote: >Isn't there a REP instruction that continues until CS or something >reaches zero? Yes, cx or ecx, but it repeatedly executes the same instruction, which is different from what you are thinking. REP STOSB is the equiv of while( ECX-- ) *(BYTE*)(EDI++) = AL; The instruction is "complete" (all regeisters are updated, everything is in a known state, ready for the next iteration) after _each_ iteration. In the above, ecx and edi and the memory have been updated by the time it gets to the ; at which point it is stable, and available for interrupts before looping for another go.
Technical Details
Message-ID:
<e1auu01p1rc79m298c2hpb4h42nk5i70u2@4ax.com>Path:
arc1-ca.pugleaf.net!g2news1.google.com!news2.google.com!proxad.net!proxad.net!194.117.148.138.MISMATCH!pe2.news.blueyonder.co.uk!blueyonder!news-peer-test!btnet!newsfeed.bt.es!caladan.landsraad.net!newsgroups.borland.com!not-for-mailReferences:
<41edea6b@newsgroups.borland.com> <41ee3727$1@newsgroups.borland.com> <41ee742e$1@newsgroups.borland.com> <41ee8f57$1@newsgroups.borland.com> <qu9tu0hgv4gqnlvv65nqq70ua4v73jv0mu@4ax.com> <ktatu01v81kub73v28uhkhp1ccrl4ct9j6@4ax.com> <qmmtu09mtj1dnckicq85cq03k9ro6aqsje@4ax.com> <ddotu0t652i1q3a5ulnnt0c78ocr25vuae@4ax.com> <5a0uu015uqqt50bu5knqa704tkhkmuebia@4ax.com>Show Full Headers
Complete Article Headers
X-Google-Thread: 10cc67,4809cdd9a7828fa7 X-Google-Attributes: gid10cc67,public X-Google-Language: ENGLISH,ASCII-7-bit From: Bob Gonder <notbg@notmindspring.invalid> Newsgroups: borland.public.cppbuilder.nativeapi Subject: Re: Accessing same variable from multiple threads Date: Wed, 19 Jan 2005 19:58:41 -0800 Organization: MindSpring Enterprises, Inc. Reply-To: notbg@notmindspring.invalid Message-ID: <e1auu01p1rc79m298c2hpb4h42nk5i70u2@4ax.com> References: <41edea6b@newsgroups.borland.com> <41ee3727$1@newsgroups.borland.com> <41ee742e$1@newsgroups.borland.com> <41ee8f57$1@newsgroups.borland.com> <qu9tu0hgv4gqnlvv65nqq70ua4v73jv0mu@4ax.com> <ktatu01v81kub73v28uhkhp1ccrl4ct9j6@4ax.com> <qmmtu09mtj1dnckicq85cq03k9ro6aqsje@4ax.com> <ddotu0t652i1q3a5ulnnt0c78ocr25vuae@4ax.com> <5a0uu015uqqt50bu5knqa704tkhkmuebia@4ax.com> X-Newsreader: Forte Agent 1.93/32.576 English (American) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-Posting-Host: 69.69.91.123 X-Trace: newsgroups.borland.com 1106193517 69.69.91.123 (19 Jan 2005 19:58:37 -0800) Lines: 19 Path: arc1-ca.pugleaf.net!g2news1.google.com!news2.google.com!proxad.net!proxad.net!194.117.148.138.MISMATCH!pe2.news.blueyonder.co.uk!blueyonder!news-peer-test!btnet!newsfeed.bt.es!caladan.landsraad.net!newsgroups.borland.com!not-for-mail