Class _DummyModuleLock

Lib/importlib/_bootstrap.py:392–410

A simple _ModuleLock equivalent for Python builds without multi-threading support.

class _DummyModuleLock:
    """A simple _ModuleLock equivalent for Python builds without
    multi-threading support."""

    def __init__(self, name):
        self.name = name
        self.count = 0

    def acquire(self):
        self.count += 1
        return True

    def release(self):
        if self.count == 0:
            raise RuntimeError('cannot release un-acquired lock')
        self.count -= 1

    def __repr__(self):
        return f'_DummyModuleLock({self.name!r}) at {id(self)}'


class _ModuleLockManager: