Module sync

Synchronization mechanisms based on the Python GIL.

With the acceptance of PEP 703 (aka a “freethreaded Python”) for Python 3.13, these are likely to undergo significant developments in the future.

Modules

• once_lock_ext_sealed 🔒 rustc_has_once_lock

Structs

• GILOnceCell
  A write-once primitive similar to std::sync::OnceLock<T>.
• GILProtectedNon-Py_GIL_DISABLED
  Value with concurrent access protected by the GIL.
• Guard 🔒
• Interned 👻
  Implementation detail for intern! macro.

Traits

• OnceExt
  Helper trait for Once to help avoid deadlocking when using a Once when attached to a Python thread.
• OnceLockExtrustc_has_once_lock
  interpreter and initialization with the OnceLock.

Functions

• init_once_force_py_attached 🔒
• init_once_lock_py_attached 🔒 rustc_has_once_lock
• init_once_py_attached 🔒
• with_critical_section
  Executes a closure with a Python critical section held on an object.