sleep[procedure] sleep [x]
Bigloo: sleeps for x microseconds.
Chicken: Puts the process to sleep for x seconds. Returns either 0 if the time has completely elapsed, or the number of remaining seconds, if a signal occurred.
MzScheme: causes the current thread to sleep for x seconds.
SRFI-18 and SRFI-21 have thread-sleep!.
Gauche has sys-sleep.
[procedure] sleep x
STklos: the argument is mandatory.
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