Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
What is a process?
|
The basic computational unit in an operating system. A program in execution.
|
|
|
What is a thread?
|
A light-weight process. Shares a common address space, but each have their own local state.
|
|
|
What is a Process Control Block (PCB)?
What does it contain? |
The activation record of a process.
It contains state information such as the program counter, register contents, stack pointers, communication ports, and file descriptors. |
|
|
What is a Thread Control Block (TCB)?
What does it contain? |
Like a PCB but managed by the thread run-time library.
Contains registers, PC, and stack pointers. |
|
|
What is a User Space Thread implementation?
|
A thread package implemented as a software layer.
|
|
|
What is a Kernel Space Thread implementation?
|
A thread package implemented at the kernel level.
|
|
|
What communication scenarios correspond to simplex, half-duplex, and full-duplex?
|
One-way, client/server, and peer.
|
|
|
What is the client/server model?
Can the same process play both roles? |
The programming paradigm in which any process in a system either provides services (server) or requests services (client). There is an underlying assumption of a synchronous request/reply exchange of information.
Yes. |
|
|
What are the two best ways to combine several UTCs (Universal Coordinated Time)?
|
Averaging or median because suspiciously erroneous readings can be excluded or compensated for.
|
|
|
What are the 3 rules for total ordering of events?
|
1. If a -> b within the same process then C(a) < C(b)
2. If a is the sending event of Pi and b is the corresponding receiving event of Pj, then Ci(a) < Cj(b) 3. For all events a and b, C(a) != C(b). |
