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usleep(3B)
suspend execution for interval in microseconds
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
Also by this name: usleep(3), Libraries: curses, OPEN LOOK and others
NAME
usleep - suspend execution for interval in microseconds
SYNOPSIS
cc [ flag... ] file ... -lucb usleep(useconds) unsigned useconds;
DESCRIPTION
Suspend the current process for the number of microseconds specified by the argument. The actual suspension time may be an arbitrary amount longer because of other activity in the system, or because of the time spent in processing the call. The routine is implemented by setting an interval timer and pausing until it occurs. The previous state of this timer is saved and restored. If the sleep time exceeds the time to the expiration of the previous timer, the process sleeps only until the signal would have occurred, and the signal is sent a short time later. This routine is implemented using setitimer [see getitimer(2)]; it requires eight system calls each time it is invoked.
SEE ALSO
sigpause(3), sleep(3), ualarm(3). getitimer(3), alarm(2) in the Programmer's Reference Manual.