Trait lock_api::mutex::RawMutexFair

pub unsafe trait RawMutexFair: RawMutex {
    // Required method
    unsafe fn unlock_fair(&self);

    // Provided method
    unsafe fn bump(&self) { ... }
}

Additional methods for mutexes which support fair unlocking.

Fair unlocking means that a lock is handed directly over to the next waiting thread if there is one, without giving other threads the opportunity to “steal” the lock in the meantime. This is typically slower than unfair unlocking, but may be necessary in certain circumstances.

Required Methods

unsafe fn unlock_fair(&self)

Unlocks this mutex using a fair unlock protocol.

Safety

This method may only be called if the mutex is held in the current context, see the documentation of unlock.

Provided Methods

unsafe fn bump(&self)

Temporarily yields the mutex to a waiting thread if there is one.

This method is functionally equivalent to calling unlock_fair followed by lock, however it can be much more efficient in the case where there are no waiting threads.

Safety

This method may only be called if the mutex is held in the current context, see the documentation of unlock.

Object Safety

This trait is not object safe.

Implementors