G - Physics – 06 – F
Patent
G - Physics
06
F
354/230
G06F 9/46 (2006.01)
Patent
CA 1302577
MULTIPROCESSING METHOD AND ARRANGEMENT Abstract A master-slave multiprocessor is formed by connecting a slave processor to an I/O slot of a uniprocessor, and by 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 the process for execution to the master processor. On the master processor, process execution resumes at the point of suspension, and the operating system service resumes by the system call or interrupt is carried out.
557724
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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