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https://github.com/firestar5683/StarPilot.git
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AngusBell97
40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
"""Coherent mode Params reads for participating Python writers/readers.
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The sidecar lock is outside the Params key directory (no registry addition).
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Never unlink/replace it while processes are running. All locks are nonblocking:
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background refreshers retry and keep the last complete toggle object on failure.
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Legacy Dom writers are deliberately not excluded; their settled values remain
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visible, but advisory locking cannot make their multi-key writes atomic.
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"""
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from contextlib import contextmanager
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import fcntl
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import os
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from pathlib import Path
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MODE_KEYS = ("ExperimentalMode", "ConditionalChill", "ConditionalExperimental")
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@contextmanager
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def mode_lock(params, *, exclusive=False):
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directory = Path(params.get_param_path()).parent
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fd = os.open(directory / ".longitudinal_mode.lock", os.O_CREAT | os.O_RDWR | os.O_CLOEXEC, 0o660)
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try:
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fcntl.flock(fd, (fcntl.LOCK_EX if exclusive else fcntl.LOCK_SH) | fcntl.LOCK_NB)
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yield
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finally:
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os.close(fd)
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def read_mode_values(params):
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with mode_lock(params):
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return {key: params.get_bool(key) for key in MODE_KEYS}
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def request_mode_refresh(params, params_memory, toggles):
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try:
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values = read_mode_values(params)
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except OSError:
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return
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if values != getattr(toggles, "longitudinal_mode_values", None):
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params_memory.put_bool("StarPilotTogglesUpdated", True)
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