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# PyEPL: hardware/timing.pyx
#
# Copyright (C) 2003-2005 Michael J. Kahana
# Authors: Ian Schleifer, Per Sederberg, Aaron Geller, Josh Jacobs
# URL: http://memory.psych.upenn.edu/programming/pyepl
#
# Distributed under the terms of the GNU Lesser General Public License
# (LGPL). See the license.txt that came with this file.
"""
This module provides low-level timing functionality.
"""
import pygame
from pygame.time import get_ticks, delay, wait
import time
from eventpoll import pollEvents
cdef object basetime
basetime = long(0)
cdef extern from "unistd.h":
int usleep (long)
def initialize(**options):
"""
Do any preparation necessary before using timing features.
"""
global basetime
basetime = long(round(time.time() * 1000)) - get_ticks()
def finalize():
"""
Shut down timing features.
"""
pass
def universal_time():
"""
Returns the number of milliseconds elapsed since the unix epoch.
"""
global basetime
return basetime + get_ticks()
def timedCall(t, f, *targs, **dargs):
"""
At time t, call f with any remaining arguments. Returns a 2-tuple
of a timestamp for the time and maximum latency of the actual call
to f, and the return value of the call. If t is None or 0, the
call is made immediately.
INPUT ARGS:
t- time at which to execute call. This can be specified as an
integer specifying a millisecond time to run,
OR as a PresentationClock object.
f- a callable to run at the specified time
args- arguments to pass to f when it is called.
"""
if t:
# if t is a PresentationClock, then (we think) the t.get()
# method is called during the comparison
while t > universal_time():
pollEvents()
before = universal_time()
r = f(*targs, **dargs)
after = universal_time()
return ((before, after - before + 1), r)
def uSleep(usec):
"""
Force a usec sleep.
"""
usleep(usec)
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