From 0553b398fc9656ae8263c46e80213da41d584722 Mon Sep 17 00:00:00 2001 From: Boyan Date: Fri, 2 May 2025 18:57:49 +0200 Subject: [PATCH] vault backup: 2025-05-02 18:57:49 --- .obsidian/appearance.json | 3 +- .obsidian/snippets/images.css | 9 ++++++ .obsidian/workspace.json | 32 +++++++++++++------ .../Inter-Process Communication.md | 4 +-- Operating Systems/Memory Management.md | 17 +++++----- Operating Systems/Overview.md | 1 + 6 files changed, 45 insertions(+), 21 deletions(-) create mode 100644 .obsidian/snippets/images.css diff --git a/.obsidian/appearance.json b/.obsidian/appearance.json index b18015a..8781394 100644 --- a/.obsidian/appearance.json +++ b/.obsidian/appearance.json @@ -3,6 +3,7 @@ "accentColor": "#efb9fd", "theme": "obsidian", "enabledCssSnippets": [ - "dark_pdf" + "dark_pdf", + "images" ] } \ No newline at end of file diff --git a/.obsidian/snippets/images.css b/.obsidian/snippets/images.css new file mode 100644 index 0000000..ab6d3cf --- /dev/null +++ b/.obsidian/snippets/images.css @@ -0,0 +1,9 @@ +img { + display: block; + margin-left: auto; + margin-right: auto; + max-width:500px; +} +div.mermaid { + text-align: center; +} diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json index 7135d1e..b89813f 100644 --- a/.obsidian/workspace.json +++ b/.obsidian/workspace.json @@ -4,24 +4,37 @@ "type": "split", "children": [ { - "id": "bc19ba9918441c67", + "id": "1bd3c6c2ca7655f0", "type": "tabs", "children": [ { - "id": "55ce0e76102300bd", + "id": "46800597ab6eb156", "type": "leaf", "state": { "type": "markdown", "state": { - "file": "Operating Systems/Memory Management.md", + "file": "Operating Systems/Processes and Threads.md", "mode": "source", "source": false }, "icon": "lucide-file", - "title": "Memory Management" + "title": "Processes and Threads" + } + }, + { + "id": "33dc0f1ebcbf4c21", + "type": "leaf", + "state": { + "type": "release-notes", + "state": { + "currentVersion": "1.8.10" + }, + "icon": "lucide-book-up", + "title": "Release Notes 1.8.10" } } - ] + ], + "currentTab": 1 } ], "direction": "vertical" @@ -198,14 +211,15 @@ "omnisearch:Omnisearch": false } }, - "active": "55ce0e76102300bd", + "active": "33dc0f1ebcbf4c21", "lastOpenFiles": [ - "Operating Systems/assets/Pasted image 20250502183523.png", "Operating Systems/Overview.md", "Operating Systems/Processes and Threads.md", "Operating Systems/Scheduling.md", - "Operating Systems/assets/Pasted image 20250502183221.png", + "Operating Systems/Inter-Process Communication.md", "Operating Systems/Memory Management.md", + "Operating Systems/assets/Pasted image 20250502183523.png", + "Operating Systems/assets/Pasted image 20250502183221.png", "Operating Systems/assets/Pasted image 20250502183310.png", "Operating Systems/assets/Pasted image 20250502183242.png", "Operating Systems/assets/Pasted image 20250502183152.png", @@ -213,13 +227,11 @@ "Operating Systems/assets/Pasted image 20250502182934.png", "README.md", "Pasted image 20250502182936.png", - "Operating Systems/Inter-Process Communication.md", "Untitled.canvas", "Discrete Structures/Midterm/attempt 2.md", "Discrete Structures/Mathematical Data Structures.md", "Operating Systems/assets/image.png", "Operating Systems/assets/Pasted image 20250502181012.png", - "Operating Systems/assets/Pasted image 20250502180811.png", "unicef.org.md", "Linear Algebra/Matrices.md", "Languages & Machines/Regular languages.md", diff --git a/Operating Systems/Inter-Process Communication.md b/Operating Systems/Inter-Process Communication.md index 521577c..bfab30b 100644 --- a/Operating Systems/Inter-Process Communication.md +++ b/Operating Systems/Inter-Process Communication.md @@ -53,7 +53,7 @@ The result depends on when context switching[^1] happens. The part of the program where shared memory is accessed is called the **Critical Section (CS)**. ### Critical Regions/Sections -![](Pasted%20image%2020250502174340.png) +![|600](Pasted%20image%2020250502174340.png) ### Avoiding race conditions @@ -130,7 +130,7 @@ It defines procedures (i.e. methods). It uses **condition variables** (often with wait and signal[^3]operations) to allow threads to wait for certain conditions to be met before proceeding. -![](Pasted%20image%2020250502180811.png) +![|600](Pasted%20image%2020250502180811.png) --- diff --git a/Operating Systems/Memory Management.md b/Operating Systems/Memory Management.md index 9401d5d..43a2494 100644 --- a/Operating Systems/Memory Management.md +++ b/Operating Systems/Memory Management.md @@ -6,7 +6,7 @@ backlinks: - "[[Overview#Multitasking/Timesharing]]" --- -![](Pasted%20image%2020250502181012.png) +![|300](Pasted%20image%2020250502181012.png) (C.U. - Control Unit, does FDE and communicates with everything like ALU, registers, etc.) @@ -47,26 +47,27 @@ The first solution for memory management is segmentation. ### Fragmentation - Each process requires a contiguous block + > [!caution] But fragmentation bad! > It happens when the free space of the main memory is divided up into multiple parts **between** processes. It's pretty clear why that's bad. -![](Pasted%20image%2020250502182934.png) +![|600](Pasted%20image%2020250502182934.png) -![](Pasted%20image%2020250502183002.png) +![|600](Pasted%20image%2020250502183002.png) ### Memory Allocation Algorithms Define which free segment should be allocated to a new process. #### Best Fit -![](Pasted%20image%2020250502183152.png) +![|600](Pasted%20image%2020250502183152.png) #### Worst fit -![](Pasted%20image%2020250502183221.png) +![|600](Pasted%20image%2020250502183221.png) #### First fit -![](Pasted%20image%2020250502183242.png) +![|600](Pasted%20image%2020250502183242.png) #### Compaction -![](Pasted%20image%2020250502183310.png) +![|600](Pasted%20image%2020250502183310.png) >[!warning]- Issues with this @@ -77,7 +78,7 @@ Define which free segment should be allocated to a new process. ## Direct Memory Access (DMA) In order to let CPU execute process instructions while data is being transferred from disk to memory, direct memory access (DMA) is used. -![](Pasted%20image%2020250502183523.png) +![|600](Pasted%20image%2020250502183523.png) ## Fix-sized memory blocks In this scheme, memory is partitioned into blocks of the same size. Every block has the same number of bytes, which makes it easier for the system to keep track of which portions of memory are allocated or available. diff --git a/Operating Systems/Overview.md b/Operating Systems/Overview.md index 115835a..4860815 100644 --- a/Operating Systems/Overview.md +++ b/Operating Systems/Overview.md @@ -116,6 +116,7 @@ int main() { return 0; } ``` + ![example syscall](assets/image.png)