120 lines
4.7 KiB
XML
120 lines
4.7 KiB
XML
<svg viewBox="0 0 280 280" xmlns="http://www.w3.org/2000/svg" role="img" aria-labelledby="mark-title-weenix">
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<title id="mark-title-weenix">A process tree rooted at PID 1 living inside the kernel boundary, with hardware ticks outside — the roundel is the abstraction.</title>
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<desc>Frontmatter mark for the essay "Weenix" — a Unix-like kernel from scratch.</desc>
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<g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round">
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<!-- Outer roundel: this IS the kernel boundary.
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Slightly heavier weight than usual to mark its semantic role. -->
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<circle cx="140" cy="140" r="128" stroke-width="1.1"/>
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<!-- Inside: userspace process tree.
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init (PID 1) sits just inside the top, descendants fan downward.
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Process layout:
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init (140, 60) depth 0
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a (108, 100) depth 1
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b (172, 100) depth 1
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c ( 90, 142) depth 2
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d (126, 142) depth 2
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e (158, 142) depth 2
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f (188, 142) depth 2
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g (108, 184) depth 3
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h (172, 184) depth 3
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-->
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<!-- Process boxes: small open rectangles. PID 1 is slightly larger. -->
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<rect x="132" y="52" width="16" height="16" stroke-width="1.0"/>
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<!-- Tiny "1" mark: a single short vertical inside the box, at offset, suggesting PID 1
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without literal text. -->
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<line x1="140" y1="56" x2="140" y2="64" stroke-width="0.7"/>
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<rect x="101" y="93" width="14" height="14" stroke-width="0.9"/>
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<rect x="165" y="93" width="14" height="14" stroke-width="0.9"/>
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<rect x="84" y="135" width="12" height="12" stroke-width="0.8"/>
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<rect x="120" y="135" width="12" height="12" stroke-width="0.8"/>
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<rect x="152" y="135" width="12" height="12" stroke-width="0.8"/>
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<rect x="182" y="135" width="12" height="12" stroke-width="0.8"/>
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<rect x="102" y="177" width="12" height="12" stroke-width="0.8"/>
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<rect x="166" y="177" width="12" height="12" stroke-width="0.8"/>
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<!-- Fork edges: parent → child. Thin lines, drawn box-edge-to-box-edge. -->
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<g stroke-width="0.7">
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<!-- init → a -->
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<line x1="138" y1="68" x2="110" y2="93"/>
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<!-- init → b -->
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<line x1="142" y1="68" x2="170" y2="93"/>
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<!-- a → c -->
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<line x1="105" y1="107" x2="92" y2="135"/>
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<!-- a → d -->
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<line x1="111" y1="107" x2="124" y2="135"/>
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<!-- b → e -->
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<line x1="169" y1="107" x2="156" y2="135"/>
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<!-- b → f -->
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<line x1="175" y1="107" x2="186" y2="135"/>
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<!-- d → g -->
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<line x1="124" y1="147" x2="110" y2="177"/>
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<!-- e → h -->
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<line x1="158" y1="147" x2="172" y2="177"/>
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</g>
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<!-- Syscall traces: a few thin arrows from process boxes to the kernel boundary,
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showing requests crossing the abstraction. Kept sparse: 3 is enough.
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Each is a short line ending in a small arrowhead just inside the roundel. -->
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<!-- From box 'd' upward-left toward boundary -->
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<g stroke-width="0.5" stroke-dasharray="1.5 2">
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<line x1="123" y1="135" x2="80" y2="60"/>
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</g>
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<g stroke-width="0.6">
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<line x1="80" y1="60" x2="86" y2="60"/>
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<line x1="80" y1="60" x2="80" y2="66"/>
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</g>
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<!-- From box 'f' upward-right -->
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<g stroke-width="0.5" stroke-dasharray="1.5 2">
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<line x1="188" y1="138" x2="226" y2="100"/>
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</g>
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<g stroke-width="0.6">
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<line x1="226" y1="100" x2="220" y2="100"/>
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<line x1="226" y1="100" x2="226" y2="106"/>
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</g>
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<!-- From box 'g' downward-left -->
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<g stroke-width="0.5" stroke-dasharray="1.5 2">
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<line x1="108" y1="189" x2="68" y2="222"/>
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</g>
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<g stroke-width="0.6">
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<line x1="68" y1="222" x2="74" y2="222"/>
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<line x1="68" y1="222" x2="68" y2="216"/>
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</g>
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<!-- Outside the roundel: hardware. A sparse set of short radial tick marks
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at compass positions, suggesting the device layer the kernel mediates. -->
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<g stroke-width="0.7" opacity="0.85">
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<!-- top-left cluster -->
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<line x1="36" y1="64" x2="42" y2="68"/>
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<line x1="32" y1="74" x2="38" y2="76"/>
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<line x1="28" y1="86" x2="34" y2="86"/>
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<!-- top-right cluster -->
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<line x1="244" y1="64" x2="238" y2="68"/>
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<line x1="248" y1="74" x2="242" y2="76"/>
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<line x1="252" y1="86" x2="246" y2="86"/>
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<!-- bottom-left cluster -->
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<line x1="36" y1="216" x2="42" y2="212"/>
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<line x1="32" y1="206" x2="38" y2="204"/>
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<line x1="28" y1="194" x2="34" y2="194"/>
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<!-- bottom-right cluster -->
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<line x1="244" y1="216" x2="238" y2="212"/>
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<line x1="248" y1="206" x2="242" y2="204"/>
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<line x1="252" y1="194" x2="246" y2="194"/>
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</g>
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</g>
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</svg>
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