When an I / O device interrupts a program, it places the address of its vector on the bus to indicate which service routine should take control.
22.
The menus and service routine are identical, and NCL plans to continue its special Texaribbean dinners _ and 70 varieties of hot sauces _ aboard the newer ship.
23.
After converting the signature to a zero-based index, a simple lookup table can be consulted to load the program counter with the address of the proper service routine.
24.
This definition originates from single-threaded programming environments where the flow of control could be interrupted by a hardware interrupt and transferred to an interrupt service routine ( ISR ).
25.
Hence, interrupt service routines are limited in the actions they can perform; for instance, they are usually restricted from accessing the file system and sometimes even from allocating memory.
26.
Instead, Ms . McCummings, 36, has been mired in a social service routine where she is given temporary shelter for several days at a time before being deemed ineligible.
27.
The concept of context assumes significance in the case of interruptible tasks, wherein, upon being interrupted, the processor saves the context and proceeds to serve the interrupt service routine.
28.
The address of the interrupt service routine ( ISR ) is read from the interrupt vector table and loaded to the IP register, and the ISR is executed as a consequence.
29.
The rest of the operating system ( the USR, " User Service Routines " ) was swapped in and out of memory transparently ( with regard to the user's program ) as needed.
30.
Without extra arrangements to protect the return address, Re-entrancy was problematic for the same reason : An interrupt service routine must refrain from calling any subprogram that might have been the code that was interrupted.
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