Guide to Multitasking Operating Systems:Index: Difference between revisions
Created page with "==machine language== The instructions which are recognized and executed by, the CPU of a computer. A machine language program is simply long sequence of 0's and 1's. The CPU wil..." |
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assemble the above instruction.) | assemble the above instruction.) | ||
...0110 1100 0101 0011... | ...0110 1100 0101 0011... | ||
==Queue== | |||
A queue is like a waiting line at a bank with one teller, in which the first people that come into the line are the first people to be serviced by the teller, hence the First In First Out(FIFO) term. | |||
==Time-Slice== | |||
A time-slice The operating system keeps track of the value of the time-slice, and how much time each job has used up on its current time-slice. | |||
==Context-switching== | |||
Context-switching refers to the mechanism used by the operating system to stop running one job and to start running another. Among other things, the operating system must save the state of the CPU of the current job, i.e. contents of registers, stack and load the state of the CPU for the job that will take control of the CPU. | |||
[[Category:Context-switching]] | |||
Revision as of 19:42, 29 July 2012
machine language
The instructions which are recognized and executed by, the CPU of a computer. A machine language program is simply long sequence of 0's and 1's. The CPU will typically take a 32-bit string of 0's and 1's as an instruction. Since it is extremely difficult to write machine language programs directly, assemblers are used, in which the programmer uses mnemonics to symbolize the machine language instructions.
Typical Assembler Mnemonic: MOV EAX,EBX ;Move contents of EBX into EAX Corresponding machine language instruction: (wild guess... get intruction formats and manually assemble the above instruction.) ...0110 1100 0101 0011...
Queue
A queue is like a waiting line at a bank with one teller, in which the first people that come into the line are the first people to be serviced by the teller, hence the First In First Out(FIFO) term.
Time-Slice
A time-slice The operating system keeps track of the value of the time-slice, and how much time each job has used up on its current time-slice.
Context-switching
Context-switching refers to the mechanism used by the operating system to stop running one job and to start running another. Among other things, the operating system must save the state of the CPU of the current job, i.e. contents of registers, stack and load the state of the CPU for the job that will take control of the CPU.