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88 lines
2.7 KiB
Rust
88 lines
2.7 KiB
Rust
// Copyright 2020 The Jujutsu Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#![allow(missing_docs)]
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mod fallback;
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#[cfg(unix)]
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mod unix;
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use std::io;
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use std::path::PathBuf;
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use thiserror::Error;
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#[cfg(not(unix))]
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pub use self::fallback::FileLock;
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#[cfg(unix)]
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pub use self::unix::FileLock;
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#[derive(Debug, Error)]
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#[error("{message}: {path}")]
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pub struct FileLockError {
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pub message: &'static str,
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pub path: PathBuf,
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#[source]
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pub err: io::Error,
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}
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#[cfg(test)]
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mod tests {
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use std::cmp::max;
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use std::fs;
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use std::thread;
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use std::time::Duration;
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use test_case::test_case;
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use super::*;
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#[test_case(FileLock::lock)]
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#[cfg_attr(unix, test_case(fallback::FileLock::lock))]
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fn lock_basic<T>(lock_fn: fn(PathBuf) -> Result<T, FileLockError>) {
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let temp_dir = testutils::new_temp_dir();
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let lock_path = temp_dir.path().join("test.lock");
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assert!(!lock_path.exists());
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{
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let _lock = lock_fn(lock_path.clone()).unwrap();
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assert!(lock_path.exists());
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}
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assert!(!lock_path.exists());
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}
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#[test_case(FileLock::lock)]
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#[cfg_attr(unix, test_case(fallback::FileLock::lock))]
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fn lock_concurrent<T>(lock_fn: fn(PathBuf) -> Result<T, FileLockError>) {
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let temp_dir = testutils::new_temp_dir();
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let data_path = temp_dir.path().join("test");
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let lock_path = temp_dir.path().join("test.lock");
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fs::write(&data_path, 0_u32.to_le_bytes()).unwrap();
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let num_threads = max(num_cpus::get(), 4);
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thread::scope(|s| {
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for _ in 0..num_threads {
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s.spawn(|| {
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let _lock = lock_fn(lock_path.clone()).unwrap();
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let data = fs::read(&data_path).unwrap();
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let value = u32::from_le_bytes(data.try_into().unwrap());
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thread::sleep(Duration::from_millis(1));
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fs::write(&data_path, (value + 1).to_le_bytes()).unwrap();
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});
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}
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});
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let data = fs::read(&data_path).unwrap();
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let value = u32::from_le_bytes(data.try_into().unwrap());
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assert_eq!(value, num_threads as u32);
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}
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}
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