By Abraham Silberschatz, Peter Baer Galvin, Greg Gagne
Celebrating its twentieth anniversary, Silberschatz: working structures strategies, 6th variation, maintains to supply an exceptional theoretical starting place for realizing working platforms. The 6th version deals more desirable conceptual insurance and additional content material to bridge the distance among recommendations and real implementations. Threads has been extra to this most recent version and contains insurance of Pthreads and Java threads. All code examples were rewritten and at the moment are in C. elevated insurance of small footprint working structures similar to PalmOS and real-time working approach, in addition to a brand new bankruptcy on home windows 2000, were added.
marketplace: computing device Scientists; Programmers.
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Extra info for Operating System Concepts (6th Edition)
Interrupt architecture must save the address of the interrupted instruction. Incoming interrupts are disabled while another interrupt is being processed to prevent a lost interrupt. A trap is a software-generated interrupt caused either by an error or a user request. An operating system is interrupt driven. 4 Silberschatz, Galvin and Gagne 2002 Interrupt Handling ■ The operating system preserves the state of the CPU by storing registers and the program counter. 6 Silberschatz, Galvin and Gagne 2002 I/O Structure ■ After I/O starts, control returns to user program only upon I/O completion.
When timer reaches the value 0, an interrupt occurs. ■ Timer commonly used to implement time sharing. ■ Time also used to compute the current time. ■ Load-timer is a privileged instruction.
Monitor mode (also kernel mode or system mode) – execution done on behalf of operating system. ) ■ Mode bit added to computer hardware to indicate the current mode: monitor (0) or user (1). ■ When an interrupt or fault occurs hardware switches to monitor mode. Interrupt/fault monitor user set user mode Privileged instructions can be issued only in monitor mode. 19 Silberschatz, Galvin and Gagne 2002 I/O Protection ■ All I/O instructions are privileged instructions. , a user program that, as part of its execution, stores a new address in the interrupt vector).
Operating System Concepts (6th Edition) by Abraham Silberschatz, Peter Baer Galvin, Greg Gagne