Operating system for a multi-tasking operating environment
Method and apparatus for the context switching of devices
Determination of time of execution of predetermined data processing routing in relation to occurrence of prior externally observable event
Interrupt test circuit for microprocessor system
Method and apparatus for substantially concurrent multiple instruction thread processing by a single pipeline processor
Method and apparatus for rapidly switching processes in a computer system
System and method for custom context switching
Preemptive multithreading computer system with clock activated interrupt Patent #: 5694604
ApplicationNo. 09242974 filed on 06/25/1998
US Classes:712/228, Context preserving (e.g., context swapping, checkpointing, register windowing712/234, Conditional branching711/202, Address mapping (e.g., conversion, translation)710/260, INTERRUPT PROCESSING712/245, Processing sequence control (i.e., microsequencing)718/108Context switching
ExaminersPrimary: Chan, Eddie P.
Assistant: Li, Aimee J.
Attorney, Agent or Firm
International ClassG06F 7/38
AbstractAn unpredictable microprocessor or microcomputer comprises a processor (1), a first working memory (51), a main memory (6) containing an operating system, a main program (P1) and a secondary program (P2), a second working memory (52), and switching means which, during the performance of the programs, makes it possible to switch from using one of the two working memories (51, 52) to using the other working memory, while preserving their contents. Switching means comprise at least one first block of registers (54) for storing the operating context of the programs in the main memory and a switching circuit (53) for enabling one of the working memories and the access registers (A1–a3) (d1–d3) associated with each memory (51, 52, 6) and controlled by said switching circuit (53).