(BSD System Compatibility)
usleep(3bsd)
usleep --
(BSD) suspend execution for interval in microseconds
Synopsis
/usr/ucb/cc [flag . . . ] file . . .
usleep(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(3C));
it requires eight system calls each time it is invoked.
References
alarm(2),
getitimer(3C),
sigpause(3bsd),
sleep(3bsd),
ualarm(3bsd)
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004