|
Last change
on this file since 312 was 2, checked in by Rick van der Zwet, 15 years ago |
|
Initial import of data of old repository ('data') worth keeping (e.g. tracking
means of URL access statistics)
|
|
File size:
1.3 KB
|
| Rev | Line | |
|---|
| [2] | 1 | # Rick van der Zwet
|
|---|
| 2 | # 0433373
|
|---|
| 3 | # OS Assigment 4
|
|---|
| 4 | # Licence: BSD
|
|---|
| 5 | # $Id: README.txt 540 2008-04-01 20:51:39Z rick $
|
|---|
| 6 |
|
|---|
| 7 |
|
|---|
| 8 | = Intro =
|
|---|
| 9 | File compiled on mac os x, gcc 4.0.1, and linux gcc 4.1.2.
|
|---|
| 10 |
|
|---|
| 11 |
|
|---|
| 12 |
|
|---|
| 13 | = Files =
|
|---|
| 14 | Makefile = Makefile to generate executables of C code
|
|---|
| 15 | assignment4a.c = Source code part A
|
|---|
| 16 | assignment4b.c = Source code part B
|
|---|
| 17 | assignment4c.c = Source code part C
|
|---|
| 18 | README.txt = Currently reading
|
|---|
| 19 |
|
|---|
| 20 | = Part A =
|
|---|
| 21 |
|
|---|
| 22 | It measurement times varies between 1 clocktick and 20000. It kind of
|
|---|
| 23 | depends on the OS when it swiches to a different thread and at which
|
|---|
| 24 | point.
|
|---|
| 25 |
|
|---|
| 26 | = Part B =
|
|---|
| 27 | No need for mutexes as processes will only write one variables and read
|
|---|
| 28 | the other ones. No variable is needed to be written by 2 threads. So
|
|---|
| 29 | simple checking when something is changed is suffient
|
|---|
| 30 |
|
|---|
| 31 | = Part C =
|
|---|
| 32 | Peterson's algoritm is very well documented at
|
|---|
| 33 | http://en.wikipedia.org/wiki/Peterson's_algorithm which include a rather
|
|---|
| 34 | advanced example of locking and editing. In our consumer/producer world
|
|---|
| 35 | are things way more easy. So locking/unlocking is relatively simple
|
|---|
| 36 | done, due the fact we are context switching between one consumer and
|
|---|
| 37 | one producer. There are no multiples.
|
|---|
| 38 |
|
|---|
| 39 | = Part D =
|
|---|
| 40 | Think of specilized threads inside a program waiting to do a difficult
|
|---|
| 41 | computation. The UI detects difficult program, passes the formula into
|
|---|
| 42 | 'worker' thread and get the result when done.
|
|---|
| 43 |
|
|---|
| 44 |
|
|---|
Note:
See
TracBrowser
for help on using the repository browser.
