julia

d36417b8 - Add a convenience object for expressing once-like / per-runtime patterns (#55793)

Add a convenience object for expressing once-like / per-runtime patterns (#55793) This adds 3 new types, to conveniently express 3 common concurrent code patterns: - `PerProcess`: an action that must be taken once per process - `PerThread`: an action that must be taken once per thread id - `PerTask`: an action that must be take once per task object The PerProcess object should replace `__init__` or similar hand rolled implementations of this. The PerThread object should replace code that used to use `nthreads()` to implement a much less correct version of this (though this is not recommended in most new code, some foreign libraries may need this to interact well with C). The PerTask object is simply a thin wrapper over `task_local_storage()`.