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GATE | GATE CS 2012 | Question 25

Consider the following transactions with data items P and Q initialized to zero:

T1: read (P) ;
read (Q) ;
if P = 0 then Q : = Q + 1 ;
write (Q) ;
T2: read (Q) ;
read (P) ;
if Q = 0 then P : = P + 1 ;
write (P) ;

Any non-serial interleaving of T1 and T2 for concurrent execution leads to


A serializable schedule


A schedule that is not conflict serializable


A conflict serializable schedule


A schedule for which a precedence graph cannot be drawn


Please comment below if you find anything wrong in the above post
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