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- Aleph_kernel abstract "Aleph was an operating system kernel developed at the University of Rochester as part of their RIG project in 1975. Aleph was an early set on the road to the creation of the first practical microkernel operating system, Mach.Aleph used inter-process communications to move data between programs and the kernel, so applications could transparently access resources on any machine on the local area network (which at the time was a 3-Mbit/s experimental Xerox Ethernet). The project eventually petered out after several years due to rapid changes in the computer hardware market, but the ideas led to the creation of Accent at Carnegie Mellon University, leading in turn to Mach.Applications written for the RIG system communicated via ports. Ports were essentially message queues that were maintained by the Aleph kernel, identified by a machine unique (as opposed to globally unique) ID consisting of a process id, port id pair. Processes were automatically assigned a process number, or pid, on startup, and could then ask the kernel to open ports. Processes could open several ports and then \"read\" them, automatically blocking and allowing other programs to run until data arrived. Processes could also \"shadow\" another, receiving a copy of every message sent to the one it was shadowing. Similarly, programs could \"interpose\" on another, receiving messages and essentially cutting the original message out of the conversation.RIG was implemented on a number of Data General Eclipse minicomputers. The ports were implemented using memory buffers, limited to 2 kB in size. This produced significant overhead when copying large amounts of data. Another problem, realized only in retrospect, was that the use of global ID's allowed malicious software to \"guess\" at ports and thereby gain access to resources they should not have had. And since those IDs were based on the program ID, the port IDs changed if the program was restarted, making it difficult to write servers with clients that could rely on a specific port number for service.".
- Aleph_kernel wikiPageExternalLink rashid86.pdf.
- Aleph_kernel wikiPageID "1984555".
- Aleph_kernel wikiPageLength "2578".
- Aleph_kernel wikiPageOutDegree "15".
- Aleph_kernel wikiPageRevisionID "703831492".
- Aleph_kernel wikiPageWikiLink Accent_kernel.
- Aleph_kernel wikiPageWikiLink Carnegie_Mellon_University.
- Aleph_kernel wikiPageWikiLink Category:Monolithic_kernels.
- Aleph_kernel wikiPageWikiLink Data_General_Eclipse.
- Aleph_kernel wikiPageWikiLink Ethernet.
- Aleph_kernel wikiPageWikiLink Inter-process_communication.
- Aleph_kernel wikiPageWikiLink Mach_(kernel).
- Aleph_kernel wikiPageWikiLink Microkernel.
- Aleph_kernel wikiPageWikiLink Minicomputer.
- Aleph_kernel wikiPageWikiLink Operating_system.
- Aleph_kernel wikiPageWikiLink PARC_(company).
- Aleph_kernel wikiPageWikiLink Richard_Rashid.
- Aleph_kernel wikiPageWikiLink Rochester_Intelligent_Gateway.
- Aleph_kernel wikiPageWikiLink University_of_Rochester.
- Aleph_kernel wikiPageWikiLinkText "Aleph kernel".
- Aleph_kernel wikiPageUsesTemplate Template:Cite_conference.
- Aleph_kernel subject Category:Monolithic_kernels.
- Aleph_kernel hypernym Kernel.
- Aleph_kernel type Software.
- Aleph_kernel type Kernel.
- Aleph_kernel comment "Aleph was an operating system kernel developed at the University of Rochester as part of their RIG project in 1975. Aleph was an early set on the road to the creation of the first practical microkernel operating system, Mach.Aleph used inter-process communications to move data between programs and the kernel, so applications could transparently access resources on any machine on the local area network (which at the time was a 3-Mbit/s experimental Xerox Ethernet).".
- Aleph_kernel label "Aleph kernel".
- Aleph_kernel sameAs Q4716177.
- Aleph_kernel sameAs m.06bylr.
- Aleph_kernel sameAs Q4716177.
- Aleph_kernel wasDerivedFrom Aleph_kernel?oldid=703831492.
- Aleph_kernel isPrimaryTopicOf Aleph_kernel.