You are given a new atomic primitive, called FetchAndSubtract(). It executes as a single atomic instruction, and is defined as follows: int FetchAndSubtract(int *location) {
int value = *location; // read the value pointed to by location
*location = value - 1; // decrement it, and store result back
return value; // return old value
}

Write the lock_init(), lock(), and unlock() routines that use FetchAndSubtract() to implement a working lock. Also define a lock_t structure.

Aisha has finished working on a word processing document that contains 15 pages. she has added some special elements in the first three pages, page 9 and 10, and page 15 from the document. she wants to print only these pages to see how they look. which option is the correct way to represent (in the print dialog box) the pages that aisha wants to print?

Assume the existence of a bankaccount class. define a derived class, savingsaccount that contains two instance variables: the first a double, named interestrate, and the second an integer named interesttype. the value of the interesttype variable can be 1 for simple interest and 2 for compound interest. there is also a constructor that accepts two parameters: a double that is used to initialize the interestrate variable, and a string that you may assume will contain either "simple", or "compound", and which should be used to initialize the interesttype variable appropriately. there should also be a pair of functions getinterestrate and getinteresttype that return the values of the corresponding data members (as double and int respectively).

Which of these is not a type of socket? aga (alternating grid array) pga (pin grid array) spga (staggered pin grid array) lga (land grid array)