mirror of
https://github.com/tokio-rs/tokio.git
synced 2026-08-18 00:00:09 +02:00
Carl Lerche
08e20fcf6a
Provides a thread pool dedicated to running blocking operations (#588) and update `tokio-fs` to use this pool. In an effort to make incremental progress, this is an initial step towards a final solution. First, it provides a very basic pool implementation with the intend that the pool will be replaced before the final release. Second, it updates `tokio-fs` to always use this blocking pool instead of conditionally using `threadpool::blocking`. Issue #588 contains additional discussion around potential improvements to the "blocking for all" strategy. The implementation provided here builds on work started in #954 and continued in #1045. The general idea is th same as #1045, but the PR improves on some of the details: * The number of explicit operations tracked by `File` is reduced only to the ones that could interact. All other ops are spawned on the blocking pool without being tracked by the `File` instance. * The `seek` implementation is not backed by a trait and `poll_seek` function. This avoids the question of how to model non-blocking seeks on top of a blocking file. In this patch, `seek` is represented as an `async fn`. If the associated future is dropped before the caller observes the return value, we make no effort to define the state in which the file ends up.
70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
#![warn(rust_2018_idioms)]
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use tokio::fs;
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use std::io::prelude::*;
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use std::io::BufReader;
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use tempfile::tempdir;
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#[tokio::test]
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async fn test_hard_link() {
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let dir = tempdir().unwrap();
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let src = dir.path().join("src.txt");
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let dst = dir.path().join("dst.txt");
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{
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let mut file = std::fs::File::create(&src).unwrap();
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file.write_all(b"hello").unwrap();
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}
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let dst_2 = dst.clone();
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assert!(fs::hard_link(src, dst_2.clone()).await.is_ok());
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let mut content = String::new();
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{
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let file = std::fs::File::open(dst).unwrap();
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let mut reader = BufReader::new(file);
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reader.read_to_string(&mut content).unwrap();
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}
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assert!(content == "hello");
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}
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#[cfg(unix)]
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#[tokio::test]
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async fn test_symlink() {
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let dir = tempdir().unwrap();
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let src = dir.path().join("src.txt");
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let dst = dir.path().join("dst.txt");
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{
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let mut file = std::fs::File::create(&src).unwrap();
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file.write_all(b"hello").unwrap();
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}
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let src_2 = src.clone();
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let dst_2 = dst.clone();
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assert!(fs::os::unix::symlink(src_2.clone(), dst_2.clone())
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.await
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.is_ok());
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let mut content = String::new();
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{
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let file = std::fs::File::open(dst.clone()).unwrap();
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let mut reader = BufReader::new(file);
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reader.read_to_string(&mut content).unwrap();
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}
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assert!(content == "hello");
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let read = fs::read_link(dst.clone()).await.unwrap();
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assert!(read == src);
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let symlink_meta = fs::symlink_metadata(dst.clone()).await.unwrap();
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assert!(symlink_meta.file_type().is_symlink());
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}
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