diff options
| -rw-r--r-- | content/2023-01-14-xpost-matcha-threads/gen-svg.sh | 3 | ||||
| -rw-r--r-- | content/2023-01-14-xpost-matcha-threads/index.md (renamed from content/2023-01-14-xpost-matcha-threads.md) | 18 | ||||
| -rw-r--r-- | content/2023-01-14-xpost-matcha-threads/os-vs-user-threads.drawio | 185 | ||||
| -rw-r--r-- | content/2023-01-14-xpost-matcha-threads/os-vs-user-threads.svg | 3 |
4 files changed, 209 insertions, 0 deletions
diff --git a/content/2023-01-14-xpost-matcha-threads/gen-svg.sh b/content/2023-01-14-xpost-matcha-threads/gen-svg.sh new file mode 100644 index 0000000..365e243 --- /dev/null +++ b/content/2023-01-14-xpost-matcha-threads/gen-svg.sh @@ -0,0 +1,3 @@ +#!/bin/bash + +drawio -x -f svg -t --svg-theme dark -o os-vs-user-threads.svg os-vs-user-threads.drawio diff --git a/content/2023-01-14-xpost-matcha-threads.md b/content/2023-01-14-xpost-matcha-threads/index.md index 9500300..3456b09 100644 --- a/content/2023-01-14-xpost-matcha-threads.md +++ b/content/2023-01-14-xpost-matcha-threads/index.md @@ -66,6 +66,24 @@ Implementations for different ISAs are available here: - [armv7a][yield-arm] - [riscv64][yield-rv64] +## Appendix: os-level vs user-level threading + +The figure below depicts *os-level* threading (left) vs *user-level* threading +(right). + +The main difference is that in the case of user-level threading, the operating +system (os) does not now anything about the user threads. In the concrete +example, only a **single** user thread can run at any given time, whereas in +the case of os-level threading, all threads can run truly parallel. + +When a user-level thread is scheduled, the *stack-pointer* (sp) of the os +thread is adjusted to the user threads' stack. For the example below, if the +user thread **A** is scheduled (yielded to), the stack-pointer for the os +thread **S** is switched to the **stack A**. Once the user thread yields back +to the scheduler, the stack-pointer is switched back to **stack S**. + +<img src="os-vs-user-threads.svg"> + [matcha]: https://github.com/johannst/matcha-threads [yield-x86]: https://github.com/johannst/matcha-threads/blob/master/lib/arch/x86_64/yield.s [yield-arm]: https://github.com/johannst/matcha-threads/blob/master/lib/arch/arm/yield.s diff --git a/content/2023-01-14-xpost-matcha-threads/os-vs-user-threads.drawio b/content/2023-01-14-xpost-matcha-threads/os-vs-user-threads.drawio new file mode 100644 index 0000000..1eacde1 --- /dev/null +++ b/content/2023-01-14-xpost-matcha-threads/os-vs-user-threads.drawio @@ -0,0 +1,185 @@ +<mxfile host="Electron" modified="2024-04-28T16:20:12.227Z" agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/23.1.5 Chrome/120.0.6099.109 Electron/28.1.0 Safari/537.36" etag="2RwH5VfZZgyXLsWH8aob" version="23.1.5" type="device"> + <diagram name="Page-1" id="eupsqoG42ICuPfNcTmHv"> + 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inline-block; font-size: 12px; font-family: monospace; color: rgb(240, 240, 240); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;"><font>thread<br />C<br /></font></div></div></div></foreignObject><text x="30" y="265" fill="rgb(240, 240, 240)" font-family="monospace" font-size="12px" text-anchor="middle">thread...</text></switch></g><rect x="0" y="281" width="50" height="10" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe flex-start; width: 48px; height: 1px; padding-top: 286px; margin-left: 2px;"><div data-drawio-colors="color: rgb(240, 240, 240); " style="box-sizing: border-box; font-size: 0px; text-align: left;"><div 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