Any operating system (OS) can be extended before runtime, by two means: 1) Programming; if one has the source code, by programming (coding) and then compiling the new code into a new system, and/or, 2) Patches; by applying patches into a system. Extensible OS is the accepted term for what can be more precisely and correctly termed a runtime extensible OS. In such systems, application and/or user ... [MORE] Adrenaline@ (9) Apertos@ (85) Choices@ (9) Exopc@ (9) Forth@ (200) FullPliant@ (9) GLUnix@ (41) GNU Hurd@ (20) Oberon@ (64) REBOL-IOS@ (139) Scout@ (7) Self@ (16) Smalltalk@ (300) Spring@ (15) Squeak@ (92) Submicrokernel@ (9) TUNES@ (4) x-kernel@ (118) 1. SPIN - Dynamically extensible, Exokernel-based, provides many core services: scheduler, kernel threads, domains, event dispatcher, security mechanisms, primitive VM operations. Blurs distinction between kernels and applications, which traditionally live in user-level address spaces, separated from kernel resources and services by an expensive protection boundary. Lets applications specialize the kernel by dynamically linking new code into running systems. 2. A Caching Model of Operating System Kernel Functionality - Stanford Cache Kernel, supervisor-mode component of V++ OS; caches system objects (threads, address spaces) to raise performance; microkernel alternative, performance equals normal monolithic OSs, yet gives application-level control of system resources, more modularity, scalability, smaller size, means of fault containment. 3. BITS - The Component Based Operating System: based on describing system resources as independent components, lets applications implement their own abstractions, define their own protection schemes, participate in resource management. 4. Extensible Operating Systems - Brief description, and on-site links to descriptions of Choices, Exokernel, GLUnix, VINO, SPIN. 5. Open Kernel Environment: OKE - Lets non-root users load native, fully optimized code in kernels. OKE Corral: active network environment, lets 3rd-party code manage code organization at any level of nodes. LEGO-like model from MIT Click router. Description, papers, release page, contacts. [Open Source, GPL] 6. Using Kernel Extensions to Decrease the Latency of User-Level Communication Primitives - Suggests solving networking and distributed systems latency via operating system extensibility; University of New Mexico Technical Report.

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