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80 lines
2.7 KiB
Rust
80 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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#[cfg_attr(unix, path = "lock/unix.rs")]
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#[cfg_attr(not(unix), path = "lock/fallback.rs")]
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mod platform;
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pub use platform::FileLock;
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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::OpenOptions;
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use std::thread;
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use std::time::Duration;
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use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
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use super::*;
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#[test]
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fn lock_basic() {
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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 = FileLock::lock(lock_path.clone());
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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]
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fn lock_concurrent() {
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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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let mut data_file = OpenOptions::new()
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.create(true)
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.write(true)
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.open(data_path.clone())
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.unwrap();
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data_file.write_u32::<LittleEndian>(0).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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let data_path = data_path.clone();
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let lock_path = lock_path.clone();
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s.spawn(move || {
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let _lock = FileLock::lock(lock_path);
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let mut data_file = OpenOptions::new()
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.read(true)
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.open(data_path.clone())
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.unwrap();
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let value = data_file.read_u32::<LittleEndian>().unwrap();
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thread::sleep(Duration::from_millis(1));
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let mut data_file = OpenOptions::new().write(true).open(data_path).unwrap();
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data_file.write_u32::<LittleEndian>(value + 1).unwrap();
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});
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}
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});
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let mut data_file = OpenOptions::new().read(true).open(data_path).unwrap();
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let value = data_file.read_u32::<LittleEndian>().unwrap();
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assert_eq!(value, num_threads as u32);
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}
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}
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