在Debian系统中,使用readdir函数进行多线程目录扫描需要结合POSIX线程(pthread)库来实现。以下是一个简单的示例,展示了如何使用readdir和pthread进行多线程目录扫描:
gcc编译器。如果没有,请运行以下命令安装:sudo apt-get update
sudo apt-get install gcc
multi_threaded_directory_scanner.c的C文件,并将以下代码粘贴到文件中:#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <pthread.h>
#define NUM_THREADS 4
typedef struct {
char *path;
} thread_data_t;
void *scan_directory(void *arg) {
DIR *dir;
struct dirent *entry;
thread_data_t *data = (thread_data_t *)arg;
dir = opendir(data->path);
if (dir == NULL) {
perror("opendir");
pthread_exit(NULL);
}
while ((entry = readdir(dir)) != NULL) {
if (entry->d_type == DT_REG) {
printf("File: %s\n", entry->d_name);
}
}
closedir(dir);
pthread_exit(NULL);
}
int main(int argc, char *argv[]) {
pthread_t threads[NUM_THREADS];
thread_data_t thread_data[NUM_THREADS];
char *directories[NUM_THREADS] = {"/path/to/dir1", "/path/to/dir2", "/path/to/dir3", "/path/to/dir4"};
int i;
if (argc > 1) {
for (i = 1; i < argc; i++) {
directories[i - 1] = argv[i];
}
}
for (i = 0; i < NUM_THREADS; i++) {
thread_data[i].path = directories[i % (argc > 1 ? argc - 1 : 1)];
if (pthread_create(&threads[i], NULL, scan_directory, (void *)&thread_data[i]) != 0) {
perror("pthread_create");
exit(EXIT_FAILURE);
}
}
for (i = 0; i < NUM_THREADS; i++) {
pthread_join(threads[i], NULL);
}
return 0;
}
将/path/to/dir1、/path/to/dir2等替换为你想要扫描的目录路径。
使用以下命令编译C文件:
gcc -o multi_threaded_directory_scanner multi_threaded_directory_scanner.c -lpthread
./multi_threaded_directory_scanner
这个示例程序将创建4个线程,每个线程负责扫描一个目录。你可以根据需要调整线程数量和要扫描的目录。请注意,这个示例仅用于演示目的,实际应用中可能需要更多的错误处理和功能。