Enum std::thread::LocalKeyState [−] [src]

pub enum LocalKeyState {
    Uninitialized,
    Valid,
    Destroyed,
}

Unstable
: state querying was recently added

Indicator of the state of a thread local storage key.

Variants

`Uninitialized`	Unstable : state querying was recently added All keys are in this state whenever a thread starts. Keys will transition to the `Valid` state once the first call to `with` happens and the initialization expression succeeds. Keys in the `Uninitialized` state will yield a reference to the closure passed to `with` so long as the initialization routine does not panic.
`Valid`	Unstable : state querying was recently added Once a key has been accessed successfully, it will enter the `Valid` state. Keys in the `Valid` state will remain so until the thread exits, at which point the destructor will be run and the key will enter the `Destroyed` state. Keys in the `Valid` state will be guaranteed to yield a reference to the closure passed to `with`.
`Destroyed`	Unstable : state querying was recently added When a thread exits, the destructors for keys will be run (if necessary). While a destructor is running, and possibly after a destructor has run, a key is in the `Destroyed` state. Keys in the `Destroyed` states will trigger a panic when accessed via `with`.