def monotonic():
"""Monotonic clock, cannot go backward."""
ts = timespec()
if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(ts)):
errno = ctypes.get_errno()
raise OSError(errno, os.strerror(errno))
return ts.tv_sec + ts.tv_nsec / 1.0e9
# Perform a sanity-check.
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