c语言快速排序并行化
时间: 2023-11-12 22:59:49 浏览: 32
C语言快速排序的并行化可以通过多线程实现。具体来说,可以将数组分成多个子数组,每个子数组由一个线程进行排序,最后再将这些有序的子数组合并成一个有序的数组。这样可以提高排序的效率,但需要注意线程之间的同步和数据共享问题。
以下是一个简单的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#define MAX_SIZE 1000000
int arr[MAX_SIZE];
typedef struct {
int start;
int end;
} SortArgs;
void *quickSort(void *args) {
SortArgs *sortArgs = (SortArgs *) args;
int start = sortArgs->start;
int end = sortArgs->end;
if (start >= end) {
return NULL;
}
int pivot = arr[start];
int i = start + 1;
int j = end;
while (i <= j) {
while (i <= j && arr[i] <= pivot) {
i++;
}
while (i <= j && arr[j] > pivot) {
j--;
}
if (i < j) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
int temp = arr[start];
arr[start] = arr[j];
arr[j] = temp;
SortArgs leftArgs = {start, j - 1};
SortArgs rightArgs = {j + 1, end};
pthread_t leftThread, rightThread;
pthread_create(&leftThread, NULL, quickSort, &leftArgs);
pthread_create(&rightThread, NULL, quickSort, &rightArgs);
pthread_join(leftThread, NULL);
pthread_join(rightThread, NULL);
return NULL;
}
int main() {
int n;
printf("请输入数组大小:");
scanf("%d", &n);
printf("请输入数组元素:");
for (int i = 0; i < n; i++) {
scanf("%d", &arr[i]);
}
SortArgs args = {0, n - 1};
pthread_t thread;
pthread_create(&thread, NULL, quickSort, &args);
pthread_join(thread, NULL);
printf("排序后的数组为:");
for (int i = 0; i < n; i++) {
printf("%d ", arr[i]);
}
printf("\n");
return 0;
}
```