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bearhunter [10]
2 years ago
13

Explain why Windows and Linux implements multiple locking mechanisms. Describe the circumstances under which they use spinlocks,

mutex locks, semaphores, and condition variables. In each case, explain why the mechanism is needed.
Computers and Technology
1 answer:
galben [10]2 years ago
8 0

Answer:

The description for the given question is described in the explanation section below.

Explanation:

Depending on the needs of the device programmers these OS have various locking frameworks. Spinlocks become beneficial for preemptive multitasking processes during which a thread will operate in such an active loop instead of risking a rest queue latency. Mutexes become beneficial to utility lockers.

  • Solaris 2 employs flexible mutexes, indicating something like this on preemptive multitasking computers, the mutex is introduced with either a spinning switch.
  • Semaphores and state variations are much more effective methods for consistency where a commodity needs to be managed for such a prolonged period of time because spinning is unstable over a prolonged time.

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3.14 LAB: Simple statistics for Python
Ad libitum [116K]

Answer:

Following are the correct python code to this question:

n1 = float(input('Input first number: '))#input first number  

n2 = float(input('Input second number: '))#input second number  

n3 = float(input('Input third number: '))#input third number  

n4 = float(input('Input fourth number: '))#input fourth number  

average = (n1+n2+n3+n4)/4 #calculate input number average

product = n1*n2*n3*n4 # calculate input number product

print('product: {:.0f}  average: {:.0f}'.format(round(product),round(average))) #print product and average using round function

print('product: {:.3f}  average: {:.3f}'.format(product,average)) #print product and average value

Output:

Please find the attachment.

Explanation:

The description of the above python code can be defined as follows:

  • In the above python program four variable "n1, n2, n3, and n4" is defined, in which we take input from the user end, and in these user inputs we use the float method, that converts all the input value in to float value.
  • In the next step, two variable average and product are defined, that calculate all input numbers product, average, and hold value in its variable.
  • In the last line, the print method is used, which prints its variable value by using a round and format method.

8 0
2 years ago
A network router connects multiple computers together and allows them to send messages to each other. If two or more computers s
Sedbober [7]

Answer:

C = M0(M1+M2+M3)+M1(M2+M3)+M2M3 is the equation which suits

Explanation:

From the given data we can state that we need to activate only one product i.e 1------>activated 0-------->means inactivated and also only one slot is activated at a time.The resultant will be no data inputs n control bits and 2 to the power n output bits.

8 0
2 years ago
Without using any additional variables, and without changing the values of ndays or the elements of the parkingTickets array, wr
dusya [7]

Answer:

Explanation:

mostTickets=0;

for (k=0; k< ndays; k++){

if (parkingTickets[k]>mostTickets) mostTickets=parkingTickets[k];

}

7 0
2 years ago
Suppose the algorithms used to implement the operations at layer k is changed. how does this impact services at layers k-1 and k
yarga [219]
If the algorithm is changed for the operations at layer k, the services at k1 will change since the services will be operated after the layer. For the services at k-1, they will not be affected since they are prior to the algorithms.<span />
4 0
2 years ago
Assume that name has been declared suitably for storing names (like "Misha", "Emily" and "Sofia"). Assume also that stdin is a v
zaharov [31]

Answer:

// program in java.

import java.util.*;

// class definition

class Main

{// main method of the class

public static void main (String[] args) throws java.lang.Exception

{

   try{

    // object to read input

Scanner scr=new Scanner(System.in);

 // ask to enter name

System.out.print("Enter Your name: ");

 // read name from user

String NAME=scr.nextLine();

// print message

System.out.println("Greetings,"+NAME);

     

   }catch(Exception ex){

       return;}

}

}

Explanation:

Read name from user with the help of scanner object and assign it to variable "NAME".Then print a Greetings message as "Greetings,NAME" where NAME will be  replaced with user's input name.

Output:

Enter Your name: Rachel                                                                                                    

Greetings,Rachel

5 0
2 years ago
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