3 (5.8) Explain how the example concurrent program that enforces mutual exclusion with testAndSet (Fig 5.13) could lead to indefinite postponement. Indicate why this would nev- ertheless be highly unlikely. Under what circumstances would it be acceptable to use this mu- tual exclusion technique? Under what circumstances would it be completely unacceptable? 33 void main) 34 35 36 37 38 39 40 41 42 43 boolean p2MustWait-true; while !done) while p2MustWait) testAndset ( p2Mustwait, occupied ); // critical section code 45 46 47 48 49 50 51 52 p2MustWaittrue occupiedfalse; II code outside critical section l/ end while 53 end Thread T2 Figure 5.13|testAndSet instruction for mutual exclution 3 (5.8) Explain how the example concurrent program that enforces mutual exclusion with testAndSet (Fig 5.13) could lead to indefinite postponement. Indicate why this would nev- ertheless be highly unlikely. Under what circumstances would it be acceptable to use this mu- tual exclusion technique? Under what circumstances would it be completely unacceptable? 33 void main) 34 35 36 37 38 39 40 41 42 43 boolean p2MustWait-true; while !done) while p2MustWait) testAndset ( p2Mustwait, occupied ); // critical section code 45 46 47 48 49 50 51 52 p2MustWaittrue occupiedfalse; II code outside critical section l/ end while 53 end Thread T2 Figure 5.13|testAndSet instruction for mutual exclution