The enter_CS() and leave_CS() functions to implement critical section of a process are realized using test-and-set instruction as follows:

void enter_CS(X)
{
    while(test-and-set(X));
}
void leave_CS(X)
{
    X = 0;
}

In the above solution, X is a memory location associated with the  and is initialized to . The above construct used by    process p1 and p2. So above construct leads to deadlock?

Process P1 and P2 use flag which is initialized to 0  in the below code segment to access  critical section

 try-enter_cs()

{ 

  if (flag==0)

   {  

       flag=1;

      <CS>

      flag=0;

   }

}

The above code leads to 

The enter_CS() and leave_CS() functions to implement critical section of a process are realized using test-and-set instruction as follows:

void enter_CS(X)
{
    while(test-and-set(X));
}
void leave_CS(X)
{
    X = 0;
}

In the above solution, X is a memory location associated with the  and is initialized to . The above construct used by    process p1 and p2. So above construct ensures ME?

The

following program consists of 2 concurrent processes and 2 binary

semaphores. The semaphores are initialized as S0=1, S1=0

At a particular time of computation the value of a counting semaphore is

7.Then 20 V operations and 15 P operations were completed on this

semaphore.The resulting value of the semaphore is :

 Semaphore S=1, there are 5 processes po,p1,p2,p3,p4

How many maximum number of processes  can be present in critical section at any point of time?

An operating system uses bankers algorithm for deadlock

avoidance when managing the allocation of three resource types x,y,z to three

processes p0,p1,p2 . 

The allocation matrix show the number of allocated

resourses and max shows the maximum resources needed by processes during its

execution.

There are 3 units of type X, 

2 units of type Y and 2 units of type Z resourses still available. 

Consider the following independent request for additional resources in the

current state .

REQ1: p0 request 0 units of x, 1 units of y and 1 units of z

REQ2: p1 request 2 units of x, 0 units of y and 0 units of z