Multiprocessing method and arrangement

Details Multiprocessing method and arrangement Multiprocessing method and arrangement

G - Physics

06

F

354/230.82

G06F 9/46 (2006.01)

Patent

CA 1297990

- 28 - Abstract A master-slave multiprocessor is formed by connecting a slave processor to an I/O slot of a uniprocessor, and minimally modifying the uniprocessor's operating system. At initialization, one routine redirects slave interrupt vectors to point to a common interrupt handler. Before a process executes on the slave processor, another routine corrupts execution stack bounds of the process. A non-interrupt operating system call during execution of the process causes an automatic firmware check of the execution stack pointer against the stack bounds. Occurrence of an interrupt or encounter of a stack exception results in suspension of process execution and invocation of the interrupt handler or a slave stack exception handler, respectively. Each handler calls a slave delete routine to restore the process' stack bounds to valid values and to transfer process for execution to the master processor. On the master processor, process execution resumes at the point of suspension, and the operating system service required by the system call or interrupt is carried out.

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