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In computer science, a single address space operating system (or SASOS) is an operating system that provides only one globally shared address space for all processes. In a single address space operating system, numerically identical (virtual memory) logical addresses in different processes all refer to exactly the same byte of data. SASOS projects include the following:

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  • Single address space operating system (en)
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  • In computer science, a single address space operating system (or SASOS) is an operating system that provides only one globally shared address space for all processes. In a single address space operating system, numerically identical (virtual memory) logical addresses in different processes all refer to exactly the same byte of data. SASOS projects include the following: (en)
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  • In computer science, a single address space operating system (or SASOS) is an operating system that provides only one globally shared address space for all processes. In a single address space operating system, numerically identical (virtual memory) logical addresses in different processes all refer to exactly the same byte of data. Single address-space operating systems offer certain advantages. In a traditional OS with private per-process address space, memory protection is based on address space boundaries ("address space isolation"). Single address-space operating systems use a different approach for memory protection that is just as strong. One advantage is that the same virtual-to-physical map page table can be used with every process (and in some SASOS, the kernel as well). This makes context switches on a SASOS faster than on operating systems that must change the page table and flush the TLB caches on every context switch. SASOS projects include the following: * Amiga family – AmigaOS, AROS and MorphOS * Angel * BareMetal * Br1X * Genera by Symbolics * IBM i (formerly called OS/400) * Iguana at NICTA, Australia * JX a research Java OS * IncludeOS * Mungi at NICTA, Australia * Nemesis * Opal * OS-9 * Phantom OS * Scout * Singularity * Sombrero * TempleOS * Theseus OS * Torsion * VxWorks * Zephyr (en)
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