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Overview
Odd-Even Sort, also known as Brick Sort, is a relatively simple sorting algorithm, inspired by the Bubble Sort algorithm. It operates by concurrently comparing and swapping adjacent pairs of elements in the array to sort the values. The algorithm gets its name from the way it partitions the sorting operation into two phases.
For parallel or multithreaded implementations, the concurrent nature of the Odd-Even Sort becomes especially prominent. Given its inherently parallel structure, multiple pairs can be compared and potentially swapped simultaneously. This makes Odd-Even Sort an interesting choice for parallel computing environments, albeit it's not the most efficient sorting algorithm for larger datasets.
Each of these codes including pseudocode utilizes multithreading to perform odd-even sort. Note that depending on the length of the array and the nature of the data, multithreading might not always give a performance boost due to overheads associated with thread management. The benefits become more apparent with larger datasets.
Pseudocode
DEFINE array with elements [100, 8, 100, 26, 4, 8, 66, 37, 98, 23, 83, 58, 99, 78, 73, 93, 68, 8, 16, 29] SET NUM_THREADS to 4 INITIALIZE barrier for NUM_THREADS STRUCTURE ThreadParams WITH INTEGER threadId FUNCTION ThreadSort(ARGUMENTS arg AS POINTER TO ThreadParams) RETURNS NOTHING SET threadId to arg->threadId SET n to size of array FOR phase from 0 to n - 1 DO SET begin to (threadId if threadId MOD 2 equals phase MOD 2 else threadId + 1) FOR i from begin to n - 2 by NUM_THREADS STEPS DO IF array[i] > array[i + 1] THEN SWAP array[i] with array[i + 1] ENDIF ENDFOR BARRIER WAIT ENDFOR RETURN NOTHING ENDFUNCTION FUNCTION main() RETURNS INTEGER INITIALIZE threads[NUM_THREADS] for storing thread identifiers INITIALIZE params[NUM_THREADS] for storing thread parameters FOR i from 0 to NUM_THREADS - 1 DO SET params[i].threadId to i CREATE THREAD with ThreadSort function and params[i] as arguments STORE THREAD ID in threads[i] ENDFOR FOR i from 0 to NUM_THREADS - 1 DO JOIN threads[i] ENDFOR DESTROY barrier PRINT "Sorted Array: " FOR EACH element IN array DO PRINT element ENDFOR RETURN 0 ENDFUNCTION
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These implementations perform parallel Odd-Even Sort with multithreading, dividing the array into chunks and processing them concurrently
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