函数 create_dir_all 

pub async fn create_dir_all(path: impl AsRef<Path>) -> Result<()>

递归创建一个目录及其所有缺失的父目录组件。

这是 std::fs::create_dir_all.

Platform-specific behavior

此函数当前对应于 mkdir function on Unix and the CreateDirectory function on Windows. 请注意，此 将来可能会发生变化.

Errors

在以下情况下此函数将返回错误，但不限于以下这些情况：

• If any directory in the path specified by path does not already exist and it could not be created otherwise. The specific error conditions for when a directory is being created (after it is determined to not exist) are outlined by fs::create_dir.

Notable exception is made for situations where any of the directories specified in the path 可能在并发创建时无法被创建。 此类情况视为成功。也就是说，调用 create_dir_all 从多个线程或进程并发调用保证不会因与自身的竞态条件而失败。

示例

use tokio::fs;

#[tokio::main]
async fn main() -> std::io::Result<()> {
    fs::create_dir_all("/some/dir").await?;
    Ok(())
}