使用pthreads和openmp实现哈希查找算法的代码

下面是使用pthreads和OpenMP实现哈希查找算法的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <omp.h>

#define NUM_THREADS 4
#define HASH_SIZE 10

typedef struct {
    int key;
    int value;
} KeyValuePair;

KeyValuePair hashtable[HASH_SIZE];

pthread_mutex_t lock;

void insert(int key, int value) {
    int index = key % HASH_SIZE;
    pthread_mutex_lock(&lock);
    hashtable[index].key = key;
    hashtable[index].value = value;
    pthread_mutex_unlock(&lock);
}

int search(int key) {
    int index = key % HASH_SIZE;
    pthread_mutex_lock(&lock);
    int value = hashtable[index].value;
    pthread_mutex_unlock(&lock);
    return value;
}

void* insertThread(void* arg) {
    KeyValuePair* pair = (KeyValuePair*)arg;
    insert(pair->key, pair->value);
    free(pair);
    return NULL;
}

int main() {
    pthread_mutex_init(&lock, NULL);
    pthread_t threads[NUM_THREADS];

    // Insert key-value pairs using multiple threads
    for (int i = 0; i < NUM_THREADS; i++) {
        KeyValuePair* pair = (KeyValuePair*)malloc(sizeof(KeyValuePair));
        pair->key = i;
        pair->value = i * 10;
        pthread_create(&threads[i], NULL, insertThread, pair);
    }

    // Wait for all threads to finish
    for (int i = 0; i < NUM_THREADS; i++) {
        pthread_join(threads[i], NULL);
    }

    // Search for key-value pairs using OpenMP parallelism
    #pragma omp parallel for num_threads(NUM_THREADS)
    for (int i = 0; i < NUM_THREADS; i++) {
        int value = search(i);
        printf("Key: %d, Value: %d\n", i, value);
    }

    pthread_mutex_destroy(&lock);
    return 0;
}

该代码使用pthreads库和OpenMP库分别实现了哈希表的插入和查找操作。在主函数中，首先使用多个线程并发地插入了一些键值对到哈希表中。然后，使用OpenMP并行地搜索哈希表中的键值对。在插入操作和搜索操作中，通过互斥锁来保证线程安全性。最后，打印出搜索结果