Term
| The concept of processes ? |
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Definition
process is a job IN execution
process occupies main memory |
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Term
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Definition
1. running - using CPU
2. blocked or (waiting) - in i/o
3. ready - waiting on CPU assignment
4. terminated - done |
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Term
| fill out a state transition diagram |
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Definition
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Term
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Definition
| multiprogramming is a technique that loads many jobs in the main memory that will run concurrently |
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Term
| How a OS manages processes ? |
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Definition
process table - snapshot of all processes
- holds:
pc value -
address for next instruction pointers
base and limit - legal range a program can visit
register values -
PCB - Process control block
contains:
process state
program counter
cpu registers
memory management
i/o status info |
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Term
| what is a context switch ? |
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Definition
| system switches to another process, saves state of old process in PCB, loads saved state of new process |
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Term
| Unix process creation and termination function calls ? |
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Definition
unix uses fork() system call to generate a new process, and uses exec() call to replace the process's memory space with a new program
exit() to terminate |
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Term
| Win32 process creation / termination function calls ? |
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Definition
createProcess()
TerminateProcess() |
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Term
| What is the shared-memory/msg concept ? |
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Definition
one process produces the data, another consumes it. p1 writes, p2 reads
msg system - one process generates message and calls OS to pass message on |
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Term
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Definition
the interface of an RMI server and client must extend REMOTE interface
purpose of command "rmic" - compiles server object & generates server code
command that starts registry:
startrmiregistry
in unix: rmi registry |
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