Linux copendir如何实现多线程遍历

在 Linux 中，copendir() 函数用于打开一个目录流，以便读取目录中的条目。要实现多线程遍历目录，你可以使用 POSIX 线程（pthreads）库来创建多个线程，每个线程负责处理目录的一部分。以下是一个简单的示例，展示了如何使用 copendir() 和 pthreads 实现多线程遍历目录：

#<span>include <stdio.h></span>#<span>include <stdlib.h></span>#<span>include <dirent.h></span>#<span>include <pthread.h></span>#<span>include <string.h></span>typedef <span>struct {</span>    char *path;    DIR *dir;} thread_data_t;void *process_directory(<span>void *arg)</span> {    thread_data_t *data = (thread_data_t *)arg;    <span>struct dirent *entry;</span>    char full_path[1024];    while ((entry = readdir(data->dir)) != NULL) {        if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)            continue;        snprintf(full_path, sizeof(full_path), "%s/%s", data->path, entry->d_name);        printf("Thread %ld: %sn", pthread_self(), full_path);        // 如果需要递归遍历子目录，可以在这里调用 process_directory() 函数    }    closedir(data->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;    }    char path[1024];    snprintf(path, sizeof(path), "%s", argv[1]);    DIR *dir = opendir(path);    if (dir == NULL) {        perror("opendir");        return 1;    }    pthread_t threads[4];    thread_data_t thread_data[4];    for (int i = 0; i < 4; ++i) {        thread_data[i].path = path;        thread_data[i].dir = dir;        if (pthread_create(&threads[i], NULL, process_directory, (void *)&thread_data[i]) != 0) {            perror("pthread_create");            return 1;        }    }    for (int i = 0; i < 4; ++i) {        pthread_join(threads[i], NULL);    }    closedir(dir);    return 0;}

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