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38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
#
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# Copyright 2017 Ettus Research, National Instruments Company
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#
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# SPDX-License-Identifier: GPL-3.0
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#
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"""
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Miscellaneous utilities for MPM
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"""
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import time
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def poll_with_timeout(state_check, timeout_ms, interval_ms):
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"""
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Calls state_check() every interval_ms until it returns a positive value, or
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until a timeout is exceeded.
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Returns True if state_check() returned True within the timeout.
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Arguments:
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state_check -- Functor that returns a Boolean success value, and takes no
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arguments.
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timeout_ms -- The total timeout in milliseconds. state_check() has to
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return True within this time.
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interval_ms -- Sleep time between calls to state_check(). Note that if
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interval_ms is larger than timeout_ms, state_check() will be
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called exactly once, and then poll_with_timeout() will still
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sleep for interval_ms milliseconds. Typically, interval_ms
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should be chosen much smaller than timeout_ms, but not too
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small for this to become a busy loop.
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"""
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max_time = time.time() + (float(timeout_ms) / 1000)
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interval_s = float(interval_ms) / 1000
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while time.time() < max_time:
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if state_check():
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return True
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time.sleep(interval_s)
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return False
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