Maurice Tutor

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Teaching Since: May 2017
Last Sign in: 307 Weeks Ago, 1 Day Ago
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Communications Posted 28 Aug 2017 My Price 5.00

Boolean blocked

Consider the following program:
Boolean blocked [2];
Int turn;
Void P (int id)
{
While (true) {
Blocked [id] = true;
While (turn! = id) {
While (blocked [1-id])
/* do nothing */;
Turn = id;
}
/* critical section */
Blocked [id] = false;
/* remainder */
}
}
Void main ()
{
Blocked [0] = false;
Blocked [1] = false;
Turn = 0;
Par begin (P (0), P (1));
}
This software solution to the mutual exclusion problem for two processes is proposed in [HYMA66]. Find a counterexample that demonstrates that this solution is incorrect. It is interesting to note that even the Communications of the ACM was fooled on this one

Answers

Maurice Tutor
(5)
Status NEW Posted 28 Aug 2017 02:08 PM My Price 5.00

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