Editing DragonFly BSD (section)

{{Short description|Free and open-source Unix-like operating system}}
{{Use dmy dates|date=June 2014}}
{{good article}}
{{Infobox OS
| name = DragonFly BSD
| logo = [[File:DragonFly BSD Logo.svg|200px]]
| screenshot = [[File:DragonFly BSD 6.2.1 boot loader screenshot.png|300px]]
| caption = DragonFly BSD 6.2.1 [[UEFI]] boot loader
| developer = [[Matthew Dillon]]
| family = [[Unix-like]] ([[Berkeley Software Distribution|BSD]])
| working state = Current
| source model = [[Open-source software|Open source]]
| released = 1.0 / {{Release date and age|2004|07|12|df=yes}}
| latest release version = 6.4.2
| latest release date = {{Release date and age|2025|05|09|df=yes}}<ref>{{cite web|url=https://www.dragonflybsd.org/release64/|title=DragonFly BSD 6.4|website=Dragonfly BSD|access-date=2025-05-14}}</ref>
| language = English
| prog_language = 
| updatemodel = 
| package_manager = DPorts, pkg
| supported platforms = [[x86-64]]
| kernel type = [[Hybrid kernel|Hybrid]]<ref name="not-microkernel" />
| userland = [[BSD]]
| ui = [[Unix shell]]
| license = [[BSD licenses#3-clause|BSD]]<ref name="dfly-license" />
| preceded_by = 
| succeeded_by = 
| website = {{URL|//www.dragonflybsd.org/}}
}}

'''DragonFly BSD''' is a [[Free and open-source software|free and open-source]] [[Unix-like]] [[operating system]] [[fork (software development)|forked]] from [[FreeBSD]] 4.8. [[Matthew Dillon]], an [[Amiga]] developer in the late 1980s and early 1990s and FreeBSD developer between 1994 and 2003, began working on DragonFly BSD in June 2003 and announced it on the FreeBSD mailing lists on 16 July 2003.<ref name="announcing-dfbsd" />

Dillon started DragonFly in the belief that the techniques adopted for [[Thread (computing)|threading]] and [[symmetric multiprocessing]] in FreeBSD 5<ref name="fbsd-smp" /> would lead to poor performance and maintenance problems. He sought to correct these anticipated problems within the FreeBSD project.<ref name="df-released-for-users" /> Due to conflicts with other FreeBSD developers over the implementation of his ideas,<ref name="behind-dfbsd" /> his ability to directly change the [[codebase]] was eventually revoked. Despite this, the DragonFly BSD and FreeBSD projects still work together, sharing bug fixes, driver updates, and other improvements. Dillon named the project after photographing a dragonfly in his yard, while he was still working on FreeBSD.{{Citation needed|date=November 2024}}

Intended as the logical continuation of the FreeBSD 4.x series, DragonFly has diverged significantly from FreeBSD, implementing [[Light Weight Kernel Threads|lightweight kernel threads]] (LWKT), an in-kernel [[message passing]] system, and the [[HAMMER (file system)|HAMMER]] [[file system]].<ref name="osnews-interview-2004" /> Many design concepts were influenced by [[AmigaOS]].<ref name="unix-for-clusters" />