59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
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#include "mergeSort.h"
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#include <stdlib.h>
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#include <assert.h>
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#include <pthread.h>
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#define THREADS
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pthread_t threads[THREADS];
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void* merge_sort(void* args) {
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margs_t* f = (margs_t*) args;
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if(f->start < f->final) {
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pthread_t t1, t2;
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index middle = (f->start + f->final) / 2;
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margs_t args1 = {f->array, f->start, middle};
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assert(!pthread_create(&t1, NULL, merge_sort, (void*) &args1));
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margs_t args2 = {f->array, middle+1, f->final};
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assert(!pthread_create(&t2, NULL, merge_sort, (void*) &args2));
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assert(pthread_join(t1, NULL));
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assert(pthread_join(t2, NULL));
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merge(f->array, f->start, middle, f->final);
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}
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int *ret = 0;
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return ret;
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}
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void merge(int array[], index start, index middle, index final) {
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length countL = middle - start + 1;
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int *arrayL = malloc(countL * sizeof(int));
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for(index currentL = 0; currentL < countL; currentL ++)
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arrayL[currentL] = array[start + currentL ];
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length countR = final - middle;
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int* arrayR = malloc(countR * sizeof(int));
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for(index currentR = 0; currentR < countR; currentR ++)
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arrayR[currentR] = array[middle + 1 + currentR ];
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index currentL, currentR, current;
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for(currentL = 0, currentR = 0, current = start;
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current <= final && currentL < countL && currentR < countR;
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current ++)
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if(arrayL[currentL] <= arrayR[currentR])
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array[current] = arrayL[currentL++];
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else
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array[current] = arrayR[currentR++];
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while(currentR < countR)
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array[current++] = arrayR[currentR++];
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while(currentL < countL)
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array[current++] = arrayL[currentL++];
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free(arrayL);
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free(arrayR);
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}
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