Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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How would I create this function using C?

e. Declare a variable, data type integer, to store the page faults, initialize to 0 (i.e., pageFaults) f. Declare a one-dimensional array, data type integer, to store the memory frame a page is allocated to (i.e., allocation), size is parameter FRAMES g. Declare a variable, data type integer, to store page hits (i.e., present) h. Declare a variable, data type integer, to store number of pages (i.e., pages) initialized to the number of page requests Initialize the allocation array by calling function memset, passing arguments i. i. Array allocation ii. -1 (i.e., INVALID) iii. sizeof(allocation) j. Using a looping construct, iterate through the number of pages i. Set variable present equal to 0 ii. Using a looping construct, iterate through the number of FRAMES 1. If the current page request is equal to the current frame allocation a. Increment the present variable by 1 b. Decrement the pageFaults variable by 1 iii. Increment the pageFaults variable by 1 iv. If the number of page faults (i.e., pageFaults) is less than or equal to the FRAMES AND variable present is equal to 0 1. Update the allocation array for the current page by setting it equal to the current pageRequest v. Else if, variable present is equal to 0 1. Replace the page at the front of the queue by updating the allocation array using index (pageFaults - 1) % FRAMES equal to the current pageRequest vi. Call function displayPages passing arguments 1. the current pageRequest 2. allocation array vii. Display to the console the total number of page faults
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Transcribed Image Text:e. Declare a variable, data type integer, to store the page faults, initialize to 0 (i.e., pageFaults) f. Declare a one-dimensional array, data type integer, to store the memory frame a page is allocated to (i.e., allocation), size is parameter FRAMES g. Declare a variable, data type integer, to store page hits (i.e., present) h. Declare a variable, data type integer, to store number of pages (i.e., pages) initialized to the number of page requests Initialize the allocation array by calling function memset, passing arguments i. i. Array allocation ii. -1 (i.e., INVALID) iii. sizeof(allocation) j. Using a looping construct, iterate through the number of pages i. Set variable present equal to 0 ii. Using a looping construct, iterate through the number of FRAMES 1. If the current page request is equal to the current frame allocation a. Increment the present variable by 1 b. Decrement the pageFaults variable by 1 iii. Increment the pageFaults variable by 1 iv. If the number of page faults (i.e., pageFaults) is less than or equal to the FRAMES AND variable present is equal to 0 1. Update the allocation array for the current page by setting it equal to the current pageRequest v. Else if, variable present is equal to 0 1. Replace the page at the front of the queue by updating the allocation array using index (pageFaults - 1) % FRAMES equal to the current pageRequest vi. Call function displayPages passing arguments 1. the current pageRequest 2. allocation array vii. Display to the console the total number of page faults
fifo 7. Write function fifo to do the following a. Return type void b. c. d. Empty parameter list Write a series of printf statements to display the algorithm name and the output header Declare a one-dimensional array, data type integer, to store the page requests (i.e., pageRequests) initialized to data set 4, 1, 2, 4, 2, 5, 1, 3, 6
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Transcribed Image Text:fifo 7. Write function fifo to do the following a. Return type void b. c. d. Empty parameter list Write a series of printf statements to display the algorithm name and the output header Declare a one-dimensional array, data type integer, to store the page requests (i.e., pageRequests) initialized to data set 4, 1, 2, 4, 2, 5, 1, 3, 6
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