Installation and subsequent safe removal of flock locks for data streams.
- Exclusive LockFile
use cluFlock::ToFlock;
use std::fs::File;
use std::io;
fn main() -> Result<(), io::Error> {
let file_lock = File::create("./file")?.wait_exclusive_lock()?;
println!("{:?}", file_lock);
Ok( () )
}- Exclusive LockFile (FnOnce)
use std::io::Write;
use cluFlock::ToFlock;
use std::fs::File;
use std::io;
fn main() -> Result<(), io::Error> {
File::create("./file")?.wait_exclusive_lock_fn(
// valid exclusive lock
|mut file| write!(file, "Test."), // result: Ok(usize)/Err(std::io::Error)
// invalid lock
|err| Err(err.into_err()) // into_err: FlockErr -> std::io::Error
)?;
Ok(())
}- Exclusive LockFile (&File)
use cluFlock::ExclusiveFlock;
use std::fs::File;
fn main() -> Result<(), std::io::Error> {
let file = File::create("./file")?;
{
let file_lock = ExclusiveFlock::wait_lock(&file)?;
// file_lock, type: FlockLock<&File>
println!("{:?}", file_lock);
} // auto unlock ExclusiveFlock
file.sync_all()?;
Ok( () )
}- Shared LockFile (&File)
use std::fs::File;
use cluFlock::SharedFlock;
use std::io;
fn main() -> Result<(), io::Error> {
let file = File::create("./test_file")?;
let shared = SharedFlock::wait_lock(&file);
println!("#1shared {:?}", shared);
let shared2 = SharedFlock::try_lock(&file);
println!("#2shared {:?}", shared2);
assert_eq!(shared.is_ok(), true);
assert_eq!(shared2.is_ok(), true);
// manual or automatic unlock SharedFlock_x2
// drop(shared);
// drop(shared2);
Ok( () )
}- Unix, Linux: Full support: SharedFlock (Wait, Try), ExclusiveFlock (Wait, Try), Unlock (Wait, Try).
- Windows: Full support: SharedFlock (Wait, Try), ExclusiveFlock (Wait, Try), Unlock (Wait, !Try). Unlock Try is not implemented and is considered additional unsafe functionality.
- Unix, Linux: The flock system call only works between processes, there are no locks inside the process.
- Windows: System calls (LockFileEx UnlockFileEx) work between processes and within the current process. If you use Shared and Exclusive locks, you can lock yourself in the same process.
Copyright 2022 #UlinProject Denis Kotlyarov (Денис Котляров)
Licensed under the Apache License, Version 2.0
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent