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80 lines
2.1 KiB
Python
80 lines
2.1 KiB
Python
"""
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limitedTime(): set a timeout in seconds when calling a function,
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raise a Timeout error if time exceed.
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"""
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from math import ceil
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IMPLEMENTATION = None
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class Timeout(RuntimeError):
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"""
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Timeout error, inherits from RuntimeError
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"""
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pass
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def signalHandler(signum, frame):
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"""
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Signal handler to catch timeout signal: raise Timeout exception.
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"""
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raise Timeout("Timeout exceed!")
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def limitedTime(second, func, *args, **kw):
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"""
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Call func(*args, **kw) with a timeout of second seconds.
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"""
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return func(*args, **kw)
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def fixTimeout(second):
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"""
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Fix timeout value: convert to integer with a minimum of 1 second
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"""
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if isinstance(second, float):
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second = int(ceil(second))
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assert isinstance(second, int)
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return max(second, 1)
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if not IMPLEMENTATION:
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try:
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from signal import signal, alarm, SIGALRM
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# signal.alarm() implementation
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def limitedTime(second, func, *args, **kw): # noqa
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second = fixTimeout(second)
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old_alarm = signal(SIGALRM, signalHandler)
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try:
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alarm(second)
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return func(*args, **kw)
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finally:
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alarm(0)
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signal(SIGALRM, old_alarm)
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IMPLEMENTATION = "signal.alarm()"
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except ImportError:
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pass
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if not IMPLEMENTATION:
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try:
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from signal import signal, SIGXCPU # noqa
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from resource import getrlimit, setrlimit, RLIMIT_CPU
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# resource.setrlimit(RLIMIT_CPU) implementation
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# "Bug": timeout is 'CPU' time so sleep() are not part of the timeout
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def limitedTime(second, func, *args, **kw): # noqa
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second = fixTimeout(second)
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old_alarm = signal(SIGXCPU, signalHandler)
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current = getrlimit(RLIMIT_CPU)
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try:
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setrlimit(RLIMIT_CPU, (second, current[1]))
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return func(*args, **kw)
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finally:
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setrlimit(RLIMIT_CPU, current)
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signal(SIGXCPU, old_alarm)
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IMPLEMENTATION = "resource.setrlimit(RLIMIT_CPU)"
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except ImportError:
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pass
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