Struct process_lock::ProcessLock
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pub struct ProcessLock(_);
Methods
impl ProcessLock
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提供进程间的共享内存模块 其中unix使用semget, semctl, semop, 其中用特殊的标识位SEM_UNDO来实现, 防止进程意外退出导致的死锁 其实windows使用CreateMutex, ReleaseMutex, WaitForSingleObject来实现
Examples, Open Double Process for same
extern crate process_lock; use std::time::{Duration, Instant}; use process_lock::*; fn main () { let mut lock = ProcessLock::new(String::from(".process_lock"), None).unwrap(); for i in 0..100 { let now = Instant::now(); { let _guard = lock.lock().unwrap(); println!("success get the {} lock lock all use time ===== {}", i, now.elapsed().as_secs()); let ten_millis = ::std::time::Duration::from_millis(2000); ::std::thread::sleep(ten_millis); } let ten_millis = ::std::time::Duration::from_millis(100); ::std::thread::sleep(ten_millis); } }
pub fn new(name: String, path_name: Option<String>) -> Result<ProcessLock>
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首先打开命名的进程锁, 如果打开失败, 则创建一个新的进程锁, 并赋与初始变量
pub fn trylock(&self) -> Result<Option<LockGuard>>
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立即返回获取进程锁, 如果成功则返回LockGuard, 如果失败则返回Ok(None), 如果发生错误则返回Error
pub fn lock(&self) -> Result<LockGuard>
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无限等待获取进程锁, 如果成功返回LockGuard, 如果被打断则系统发生错误, 可查看Error处理具体的错误 LockGuard析构会自动解锁
pub fn unlock(&self) -> Result<()>
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释放进程锁, 通常情况不主动调用, 由LockGuard的生存周期来控制锁的占用周期
pub fn destory(&mut self) -> Result<()>
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销毁进程锁, 把handle或者sem_id主动删除