https://fidoman.ru/w/index.php?action=history&feed=atom&title=Computing_concepts 2026-04-21T12:24:58Z История изменений этой страницы в вики MediaWiki 1.35.14 https://fidoman.ru/w/index.php?title=Computing_concepts&diff=205&oldid=prev 2026-03-06T20:30:58Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="ru"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Предыдущая версия</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Версия от 20:30, 6 марта 2026</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l11" >Строка 11:</td> <td colspan="2" class="diff-lineno">Строка 11:</td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Self-modifying code. Behaves like live being. Can be poisoned or be (self)killed. Not reenterable. Cannot be used in multiprocessing. Can be saved from one data asset to other or can change.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Self-modifying code. Behaves like live being. Can be poisoned or be (self)killed. Not reenterable. Cannot be used in multiprocessing. Can be saved from one data asset to other or can change.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Heap fragmentation or memory leak can be considered as von Neumann behavior.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Heap fragmentation or memory leak can be considered as von Neumann behavior.</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">von Neumann code allow trick such as executable stack that allows creating code pieces such as GCC' &lt;i&gt;trampolines&lt;/i&gt; - allowing to pack function address and context for it into one pointer.</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== meta ==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== meta ==</div></td></tr> <tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l40" >Строка 40:</td> <td colspan="2" class="diff-lineno">Строка 42:</td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  * network resource (share with UNC)</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  * network resource (share with UNC)</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  * Internet (share with URL)</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  * Internet (share with URL)</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">= Access control =</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Limits how some code, running under some personality can access other resources.</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Controlling access of memory ==</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">In C and assembler program can create intentionally any address or unintentionally go away from work region.</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Historically PDP-10 had long word that allowed pointer and limit. But in further arc's this capability is lost. But idea is still alive, new concepts such as [https://cheri-alliance.org/ CHERI] arise, that pack together base, pointer (&quot;cursor&quot;) and limit.</ins></div></td></tr> </table>

Sergey https://fidoman.ru/w/index.php?title=Computing_concepts&diff=170&oldid=prev 2025-05-04T13:11:29Z

<p>Новая страница: «= Code and data = Code is generally rule as how to process data. == Wirth code == Static code. Run just as it is saved in ROM (or in punched card, or on manual...»</p> <p><b>Новая страница</b></p><div>= Code and data =<br /> <br /> Code is generally rule as how to process data.<br /> <br /> == Wirth code ==<br /> <br /> Static code. Run just as it is saved in ROM (or in punched card, or on manual switch panel). Can be protected with CPU. Reenterable. Can be used by many processors simultaneously.<br /> <br /> == von Neumann code ==<br /> <br /> Self-modifying code. Behaves like live being. Can be poisoned or be (self)killed. Not reenterable. Cannot be used in multiprocessing. Can be saved from one data asset to other or can change.<br /> Heap fragmentation or memory leak can be considered as von Neumann behavior.<br /> <br /> == meta ==<br /> <br /> Data persisting with code from one data asset to another should be considered as part of code. It is configuration.<br /> <br /> Processing rules that arrive with data asset and that are not saved for further use can be considered as data (their meta).<br /> <br /> Data collected with program run, but not affecting processing except for management purposes (to manage resource assignment or cease processing if quota exceeded) are to be considered as upper-level data beyond program run.<br /> <br /> = Transfers =<br /> <br /> == Channel ==<br /> <br /> Direct send data from source to destination. No storage other than buffers required.<br /> <br /> * COM<br /> * TCP<br /> * HTTP<br /> <br /> == Sharing ==<br /> <br /> Send link on shared resource. Of course - at beginning should be checked or assumed that source and destination has access to same shared resource. Data must be stored on shared media, at least virtually.<br /> <br /> === Sharing levels ===<br /> <br /> * common RAM or some directly addressable register (share with address)<br /> * filesystem (share with filename)<br /> * network resource (share with UNC)<br /> * Internet (share with URL)</div>

Sergey