如何用copendir实现多线程目录遍历

copendir 是一个用于打开目录流的函数，通常用于单线程环境下的目录遍历。要在多线程环境中实现目录遍历，你可以将目录分割成多个子目录，并为每个子目录创建一个线程来处理。下面是一个简单的示例，展示了如何使用 copendir 和多线程实现目录遍历：

#<span>include <stdio.h></span>#<span>include <stdlib.h></span>#<span>include <string.h></span>#<span>include <dirent.h></span>#<span>include <pthread.h></span>#<span>define MAX_THREADS 10</span>typedef <span>struct {</span>    char *path;} thread_data_t;void *traverse_directory(<span>void *arg)</span> {    thread_data_t *data = (thread_data_t *)arg;    DIR *dir = opendir(data->path);    <span>struct dirent *entry;</span>    if (dir == NULL) {        perror("opendir");        pthread_exit(NULL);    }    while ((entry = readdir(dir)) != NULL) {        if (entry->d_type == DT_DIR && strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) {            char sub_path[1024];            snprintf(sub_path, sizeof(sub_path), "%s/%s", data->path, entry->d_name);            pthread_t thread;            thread_data_t sub_data = {sub_path};            pthread_create(&thread, NULL, traverse_directory, (void *)&sub_data);            pthread_join(thread, NULL);        }    }    closedir(dir);    pthread_exit(NULL);}int main(<span>int argc, char *argv[])</span> {    if (argc != 2) {        fprintf(stderr, "Usage: %s <directory>n", argv[0]);        return 1;    }    pthread_t main_thread;    thread_data_t main_data = {argv[1]};    pthread_create(&main_thread, NULL, traverse_directory, (void *)&main_data);    pthread_join(main_thread, NULL);    return 0;}

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