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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.
Explain briefly any three of the commonly used code optimization techniques. 1. Common sub expression elimination: In given expression as "(a+b)-(a+b)/4", in such "common
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How do you create a permanent cookie? By setting the expiry date of the cookie to a later on time (like 10 years later.)
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What is swtiches
Q. Describe about Immediate Addressing mode? When an operand is interpreted as an immediate value for example LOAD IMMEDIATE 7 it is actual value 7 which is put in CPU register
Action implementing instruction's meaning are a actually carried out by ? Ans. By instruction execution, the meaning of action implementing instruction is actually carried out.
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