| 词条 | NextBSD |
| 释义 |
}}{{Infobox OS | name = NextBSD | logo = NextBSD logo.png | screenshot = | caption = | developer = Jordan Hubbard, Kip Macy | source_model = Open source | kernel_type = Monolithic | userland = NextBSD | supported_platforms = Intel 80386 | ui = Command-line interface | family = Unix | released = {{Start date and age|2015}} | latest_release_version = Beta | latest_release_date = {{Start date and age|2015}} | latest_test_version = Beta | latest_test_date = Abandoned 2019 | marketing_target = | programmed_in = C | prog_language = | language = English | updatemodel = | package_manager = | working_state = Abandoned as of 2019, no visible changes since 2016. | license = BSD licenses | website = {{URL|http://www.nextbsd.org}} }} NextBSD is an operating system initially based on the trunk version of FreeBSD as of August 2015. It is a fork of FreeBSD which implements new features developed on branches but not yet implemented in FreeBSD. As of 2019 the website seems defunct, and the later commits on github date from July, 2016. FeaturesThe basic features of launchd, notifyd, asld, and libdispatch work. These can be installed by cloning the NextBSD repository from GitHub, building GENERIC or MACHTEST kernels, installing a new world on an existing 10.x or CURRENT system, and then following the instructions in the README. Launchd will start the initial jobs that are part of the repo now. Planned FeaturesThe project refers to an installer as the first planned milestone on their website. Future plans include convert to rc and tying notifyd in to potential consumers. HistoryNeXTBSD was announced by Jordan Hubbard and Kip Macy in August 2015 at the Bay Area FreeBSD Users Group (BAFUG). Relationship to FreeBSDNeXTBSD is based on the FreeBSD-CURRENT kernel while adding in Mach IPC, Libdispatch, notifyd, asld, launchd, and other components derived from Darwin, Apple's open-source code for macOS. TechnologyBasic Architecture
Mach Kernel Abstractions{{Context|section|date=December 2015}}TasksThe units of resource ownership; each task consists of a virtual address space, a port right namespace, and one or more threads. (Implemented as an extension to a process.) ThreadsThe units of CPU execution within a task. Simple extension to kthreads. Address spaceIn conjunction with memory managers, Mach implements the notion of a sparse virtual address space and shared memory. (No modifications) Memory objectsThe internal units of memory management. Memory objects include named entries and regions; they are representations of potentially persistent data that may be mapped into address spaces. (Unsupported) PortsSecure, simplex communication channels, accessible only via send and receive capabilities (known as port rights). IPCMessage queues, remote procedure calls, notifications, semaphores, and lock sets. (Mach semaphores and lock sets are not supported). TimeClocks, timers, and waiting - (rudimentary shims). Standards adherenceCurrent BSD operating system variants support many of the common IEEE, ANSI, ISO, and POSIX standards, while retaining most of the traditional BSD behavior. Like AT&T Unix, the BSD kernel is monolithic, meaning that device drivers in the kernel run in privileged mode, as part of the core of the operating system. A selection of significant Unix versions and Unix-like operating systems that descend from BSD includes:
See also{{Portal|Free and open-source software}}
References
Bibliography
External links
2 : FreeBSD|Berkeley Software Distribution |
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