Concurrency Example

Program a: Program b:

#!/usr/bin/csh -f #!/usr/bin/csh -f

@ count = 0 @ count = 0

while( $count < 200 ) while( $count < 200 )

@ count++ @ count++

echo -n "a" echo -n "b"

end end

• When run sequentially (a;b) output is as expected

• When run concurrently (a&;b&) output is interspersed, and re-running it may produce different output

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