Re: Peterson's Algorithm in java, sequencial instruction execution
?
Mike Schilling wrote:
<xmarlawx@gmail.com> wrote in message
news:1164416886.789925.124600@14g2000cws.googlegroups.com...
Hello guys,
I have to implement the Peterson's algorithm in java.
For who of you which is not aware about it, is a low level concurrency
solution for two threads
that want to use a shared resource.
The algorithm use three variables, two flags (booleans) and a turn
indicator (usually implemented as an int, but possibly a boolean would
work as well).
More information about the algorithm here :
http://en.wikipedia.org/wiki/Peterson's_algorithm
Now, is really easy to implement it and in theory I won't need to use
any synchronization
construct available in java (such as synchronized keyword) since the
shared memory should be enough.
If you want to guarantee that thread A sees a change to memory made by
thread B, you need to use synchronization.
Or declare them volatile.
--
Knute Johnson
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