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HelenOS
HelenOS〔(hpr1447 :: HPR Coverage at FOSDEM 2014 Part 1/5 )〕〔(HelenOS Micro-Kernel OS Still Marching On )〕〔(HelenOS - the operating system that launched a thousand processes, DistroWatch Weekly, Issue 350, 19 April 2010 )〕〔(HelenOS nikdy nebude dokončený, říká jeho autor Jakub Jermář )〕 is an operating system based on a multiserver microkernel design. The source code of HelenOS is published under a BSD License.
== Technical overview ==
The microkernel handles multitasking, memory management and inter-process communication. It also provides kernel-based threads and supports symmetric multiprocessing.
Each process (called ''task'') can contain several threads (preemptively scheduled by the kernel) which, in turn, can contain several fibers scheduled cooperatively in user space. Device and file-system drivers, as well as other system services, are implemented by a collection of user-space tasks (''servers''), creating thus the multiserver nature of HelenOS.
Tasks communicate via HelenOS IPC, which is connection-oriented and asynchronous. It can be used to send small fixed-size messages, blocks of bytes or to negotiate sharing of memory. Messages can be forwarded without copying bulk data or mapping memory to the address space of middle-men tasks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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