Blizzard
60 lines
1.2 KiB
Python
60 lines
1.2 KiB
Python
"""
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Locking constants
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Lock types:
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- `EXCLUSIVE` exclusive lock
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- `SHARED` shared lock
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Lock flags:
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- `NON_BLOCKING` non-blocking
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Manually unlock, only needed internally
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- `UNBLOCK` unlock
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"""
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import enum
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import os
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# The actual tests will execute the code anyhow so the following code can
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# safely be ignored from the coverage tests
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if os.name == 'nt': # pragma: no cover
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import msvcrt
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#: exclusive lock
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LOCK_EX = 0x1
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#: shared lock
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LOCK_SH = 0x2
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#: non-blocking
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LOCK_NB = 0x4
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#: unlock
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LOCK_UN = msvcrt.LK_UNLCK # type: ignore[attr-defined]
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elif os.name == 'posix': # pragma: no cover
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import fcntl
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#: exclusive lock
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LOCK_EX = fcntl.LOCK_EX # type: ignore[attr-defined]
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#: shared lock
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LOCK_SH = fcntl.LOCK_SH # type: ignore[attr-defined]
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#: non-blocking
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LOCK_NB = fcntl.LOCK_NB # type: ignore[attr-defined]
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#: unlock
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LOCK_UN = fcntl.LOCK_UN # type: ignore[attr-defined]
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else: # pragma: no cover
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raise RuntimeError('PortaLocker only defined for nt and posix platforms')
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class LockFlags(enum.IntFlag):
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#: exclusive lock
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EXCLUSIVE = LOCK_EX
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#: shared lock
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SHARED = LOCK_SH
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#: non-blocking
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NON_BLOCKING = LOCK_NB
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#: unlock
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UNBLOCK = LOCK_UN
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