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What are semaphores?
Semaphore: A semaphore is a synchronization tool which gives a general-purpose solution to controlling access to critical sections. It s an abstract data type (ADT) which defines a nonnegative integer variable that, apart from initialization, is accessed simply through two standard operations that are: wait and signal. The typical definition of wait in pseudo code is
wait(S){
while(S<=0)
// do nothing
S--; }
The classical definitions of signal in pseudo code is signal(S){
S++; }
While one process modifies the semaphore value, anno one process can concurrently modify that similar semaphore value. As well, in the case of the wait(S), the testing of the integer value of S (i.e. S<=0), and its possible modification(S--), should also be executed without interruption.
Use the colon operation to create a vector x of numbers -10 through 10 in steps of 1. Use matrix operations to create a vector y where each element is 5 more than 2 times the corre
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difference between pure and impute inter preter
Convert decimal 153 to octal. Equivalent in octal will be ? Ans. (153) 10 = (231) 8
Take the following flow graph and use the procedure in chapter 8 to derive an equivalent regular expression. Show all intermediate graphs (to ensure that you follow the procedure,
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How to calculate the flowchart
How optimization is achieved in DNS? Two primary optimizations used in DNS and they are: replication and caching. All root servers is replicated; various copies of the server
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