If the operation (want = false) is not atomic, we can not mutual
exclusion.Certo?
Wladimir Araujo Tavares
*Federal University of Ceará
*
On Sun, Jun 19, 2011 at 11:01 AM, Wladimir Tavares <wladimir...@gmail.com>wrote:
> One of two process can be in starvation!
>
> Wladimir Araujo Tavares
> *Federal University of Ceará
>
> *
>
>
>
>
>
> On Sun, Jun 19, 2011 at 10:49 AM, sanjay ahuja <sanjayahuja.i...@gmail.com
> > wrote:
>
>> where does it ensure that if P1 has first executed critical section
>> then it will get chance to execute critical section only after P2 has
>> executed critical section once.
>>
>> If it is strict alternation then it is ensuring bounded waiting!
>>
>>
>> On Sun, Jun 19, 2011 at 7:01 PM, Akshata Sharma
>> <akshatasharm...@gmail.com> wrote:
>> > Why is C not true?
>> >
>> > On Sun, Jun 19, 2011 at 6:31 PM, sanjay ahuja <
>> sanjayahuja.i...@gmail.com>
>> > wrote:
>> >>
>> >> B and D are true
>> >>
>> >>
>> >> On Sun, Jun 19, 2011 at 5:43 PM, Nishant Mittal
>> >> <mittal.nishan...@gmail.com> wrote:
>> >> > It does not prevent deadlock so i think (D) is definitely true.
>> >> >
>> >> > On Sun, Jun 19, 2011 at 5:15 PM, Akshata Sharma
>> >> > <akshatasharm...@gmail.com>
>> >> > wrote:
>> >> >>
>> >> >> Two processes, P1 and P2, need to access a critical section of code.
>> >> >> Consider the following synchronization construct used by the
>> processes:
>> >> >>
>> >> >> /* P1 */
>> >> >> while (true) {
>> >> >> wants1 = true;
>> >> >> while (wants2==true);
>> >> >> /* Critical Section */
>> >> >> wants1=false;
>> >> >> }
>> >> >> /* Remainder section */
>> >> >>
>> >> >> /* P2 */
>> >> >> while (true) {
>> >> >> wants2 = true;
>> >> >> while (wants1==true);
>> >> >> /* Critical Section */
>> >> >> Wants2=false;
>> >> >> }
>> >> >> /* Remainder section */
>> >> >>
>> >> >> Here, wants1 and wants2 are shared variables, which are initialized
>> to
>> >> >> false. Which one of the following statements is TRUE about the above
>> >> >> construct?
>> >> >> (A) It does not ensure mutual exclusion.
>> >> >> (B) It does not ensure bounded waiting.
>> >> >> (C) It requires that processes enter the critical section in strict
>> >> >> alternation.
>> >> >> (D) It does not prevent deadlocks, but ensures mutual exclusion.
>> >> >>
>> >> >> I think B,C are true. It also prevents deadlock so D is also true,
>> not
>> >> >> sure though. Am I right?
>> >> >>
>> >> >> --
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>> >>
>> >> --
>> >> Sanjay Ahuja,
>> >> Analyst, Financing Prime Brokerage
>> >> Nomura Securities India Pvt. Ltd
>> >>
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>>
>>
>> --
>> Sanjay Ahuja,
>> Analyst, Financing Prime Brokerage
>> Nomura Securities India Pvt. Ltd
>>
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>>
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