英文:
Is there a lower-level alternative to RwLock?
问题
在我的较低级别库中，我想要一个RwLock的功能，但是不想持有RwLockReadGuard或RwLockWriteGuard，而是想要手动告诉RwLock-类似的对象何时释放读取或写入锁定。
在std中是否有可移植的公共接口来实现这个，即使是不安全的？
英文:
In my low-ish level library, I want the functionality of a RwLock, but instead of holding a RwLockReadGuard or RwLockWriteGuard, I want to manually tell the RwLock-like object when the read or write lock has been released.
Is there portable public interface in std for this, even if unsafe?
答案1
得分: 2
不在标准库中（尽管您可以使用 RwLock<()>，但仍需持有守卫），但在 parking_lot 中有 RawRwLock：
use parking_lot::lock_api::RawRwLock as _;use parking_lot::RawRwLock;let rwlock = RawRwLock::INIT;// 写访问rwlock.lock_exclusive();// 进行操作unsafe {rwlock.unlock_exclusive();}// 读访问rwlock.lock_shared();// 进行操作unsafe {rwlock.unlock_shared();}
英文:
Not in std (although you can use RwLock<()>, but you still have to hold the guard around), but in parking_lot there is RawRwLock:
use parking_lot::lock_api::RawRwLock as _;use parking_lot::RawRwLock;let rwlock = RawRwLock::INIT;// Write accessrwlock.lock_exclusive();// Do workunsafe {rwlock.unlock_exclusive();}// Read accessrwlock.lock_shared();// Do workunsafe {rwlock.unlock_shared();}
答案2
得分: 1
你可以始终这样做：
let lock = RwLock::new(0);let mut guard = lock.write().unwrap();*guard += 1;drop(guard);// lock is unlocked now.let guard = lock.read().unwrap();println!("{}", *guard);drop(guard);// lock is unlocked now.
英文:
You always can do this:
let lock = RwLock::new(0);let mut guard = lock.write().unwrap();*guard += 1;drop(guard);// lock is unlocked now.let guard = lock.read().unwrap();println!("{}", *guard);drop(guard);// lock is unlocked now.
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