Consider the following two transactions :
t1:
read(a);
read(b...
Computers and Technology, 27.11.2019 05:31, demij
Consider the following two transactions :
t1:
read(a);
read(b);
if a = 0 then b : = b + 1;
write(b).
t2:
read(b);
read(a);
if b = 0 then a : = a + 1;
write(a).
a- add lock and unlock instructions to transactions t1 and t2, so that they observe the two-phase locking protocol.
use the lock-s and lock-x notation as defined below:
-shared lock.
if a transaction t has obtained a shared-mode lock (denotedby lock-s) on item q, thent can read, but cannot write, q. 2.
-exclusive lock.
if a transaction t has obtained an exclusive-mode lock (denoted by lock-x) on item q, thent can both read and write q.
b- can the execution of these transactions result in a deadlock? give an example if it can. write all the details.
Answers: 1
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