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find the regular grammar for the following regular expression
here are the conditions necessary for a deadlock to occur note that all of them are necessary and none is sufcient1 nite resources the resources are
at the end of this lecture and into the next lecture we will discuss the last major type of logical error that can occurwhen programming with threads
consider a large web-based database in some sense google is sort of like this there might be many users who want to read from the database but only a
when programming with threads there are three very common mistakes that programmers oftenmake1 locking twice depending on the system and type of lock
authorisationauthorisation is the culmination of the administrative policies of the organisation as the name shows authorisation is a set of
we have talked about blocking locks which voluntarily yield and spinlocks which just spin until they acquire the lock at rst it seems like spinlocks
state amp prove pumping lemma for regular set show that for the language lap p is a prime is not
now lets implement bounded producer-consumer with semaphores a coke machine which is initially emptysemaphore semmutex 1 binary semaphore for
distinguish between mealy and moore machine construct a mealy machine that can output even or odd according to the total no of 1s encountered is even
for example by initializing a semaphore to 0 threads can wait for an event to occur and impose an ordering constraint similar to a monitor using
define the following concept with an examplea ambiguity in cfgb push-down automatac turing
security and integrityafter reading the concepts of database recovery in the last section let us now deal with a vital concept that helps in
synchronization can be achieved by means other than locks and condition variables one alternative is semaphores a semaphore is used to regulate trafc
differentiate between dfa and nfa convert the following regular expression into dfa01011001also write a regular grammar for this
there is a very small amount of networking background required for project 2 in project 2 we want our computer or our host to request information
recall that condition variables are synchronization primitives that enable threads to wait until a particular condition occursgeneralizing the
log based recoverylet us first describe the term transaction log in the context of dbms a transaction log is a record in dbms that remains track of
now let us present an implementation of a producer-consumer system using condition variables this implementation worksdequeuelockawhile queue empty
what does it mean for something to be thread-safe by saying that x is thread-safe we mean that if multiple threads use x at the same time we dont
synchronization serves two purposes 1 to ensure safety for updates on shared data eg to avoid races conditions and 2 to coordinate and order actions
how could we implement locks no matter how we choose to implement them we must have some hardware support one possibility for implementing locks on a
locks also known as mutexes short for mutual exclusion locks provide mutual exclusion to shared data inside a critical session they are implemented
as we already know threadsmust ensure consistency otherwise race conditions non-deterministic results might happen now consider the too much milk
recovery techniquesafter reading the types of failures and database errors let us talk about how to recover from the failures recovery can be