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shared lock or read lock it is requested by a transaction that needs to just read the value of data item a shared lock on a data item does not permit
multiple-mode locks it offers two locks exclusive locks and shared locks but why do we require these two locks there are a lot of transactions in the
in this project you will implement the chandy and misras cm algorithm using posix threads pthreads the algorithm is a distributed
types of locksthere are two necessary types of locks binary lock this locking mechanism has two states for to a data item locked or unlocked
locksserialisabilty is just a test whether a given interleaved schedule is ok or has a concurrency related trouble though it does not make sure that
you group has been hired by trainingruscom to keeps track of training revenues trainingruscom wants you to keep schedulingcourse table contains
the next major set of tasks to tackle are delete and update version control systems typically version updates to a le and only store the differences
the rst task in the project is to develop a sane system to store change logs and versions of les the simplest approach is to create a dot directory
version control is a critical tool in development and production environments that allows a user to make snapshots of working congurations or code in
serialisable schedulesif the processes of two transactions conflict with each other how to verify that no concurrency related problems have happened
the locking protocol to manage concurrency related problems we use locking a lock is mainly a variable that is associated with a data item in the
inconsistent analysis the problem as given with transactions t1 and t2 where two transactions interleave to make incorrect result during an analysis
dirty reads t10 reads a value which is updated by t9 this update has not been committed and t9 abortst9t10value of x old value 200t9t10update
unrepeatable reads assume t7 reads x twice during its implementation if it did not update x itself it could be very disturbing to see a dissimilar
lost updates suppose the two transactions t3 and t4 run simultaneously and they happen to be interleaved in the following way suppose the initial
conflicting operations in schedulethe three simple ways of interleaved instruction implement of transactions t1 and t2 please note that in the
suppose you have a le orase of city and country names like thiscluj romaniadebrecen hungaryklagenfurt austriaberlin germanyszeged hungarybudapest
submission instructions answer the following questions using a text processing software and submit your answers via connex possible file formats for
write a perl program ghicipl one of the simplest computer games the program should generate a random integer between 1 and 1000 and asks the user to
given a list of numbers saymy inputnumbers 1 1 3 5 8 13 21 34 55 89 144write a program map1pl that will use the function mapa to produce a list of
a- in a table format compare between programmed io interrupt -driven io and direct memory access dma in terms of basic idea advantages
use the newton divided-dierence method to construct interpolating polynomials of degree one two and three for the following data approximate
a- consider a computer system that provides a virtual memory space that consists of 8 pages the physical memory contains 4 pages where the page
retransmission of packetsthe disadvantage of thronging away a correctly received packet is that the subsequent retransmission of the
maintaining the sequence numberthe other advantage of gbn is that it maintain the next sequence