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Last change
on this file since 144 was 2, checked in by Rick van der Zwet, 15 years ago |
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| 1 | # Rick van der Zwet
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| 2 | # 0433373
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| 3 | # OS Assigment 4
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| 4 | # Licence: BSD
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| 5 | # $Id: README.txt 540 2008-04-01 20:51:39Z rick $
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| 6 |
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| 7 |
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| 8 | = Intro =
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| 9 | File compiled on mac os x, gcc 4.0.1, and linux gcc 4.1.2.
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| 10 |
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| 11 |
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| 12 |
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| 13 | = Files =
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| 14 | Makefile = Makefile to generate executables of C code
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| 15 | assignment4a.c = Source code part A
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| 16 | assignment4b.c = Source code part B
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| 17 | assignment4c.c = Source code part C
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| 18 | README.txt = Currently reading
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| 19 |
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| 20 | = Part A =
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| 21 |
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| 22 | It measurement times varies between 1 clocktick and 20000. It kind of
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| 23 | depends on the OS when it swiches to a different thread and at which
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| 24 | point.
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| 25 |
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| 26 | = Part B =
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| 27 | No need for mutexes as processes will only write one variables and read
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| 28 | the other ones. No variable is needed to be written by 2 threads. So
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| 29 | simple checking when something is changed is suffient
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| 30 |
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| 31 | = Part C =
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| 32 | Peterson's algoritm is very well documented at
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| 33 | http://en.wikipedia.org/wiki/Peterson's_algorithm which include a rather
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| 34 | advanced example of locking and editing. In our consumer/producer world
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| 35 | are things way more easy. So locking/unlocking is relatively simple
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| 36 | done, due the fact we are context switching between one consumer and
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| 37 | one producer. There are no multiples.
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| 38 |
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| 39 | = Part D =
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| 40 | Think of specilized threads inside a program waiting to do a difficult
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| 41 | computation. The UI detects difficult program, passes the formula into
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| 42 | 'worker' thread and get the result when done.
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| 43 |
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| 44 |
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