|
sleep - block for some number of seconds |
sleep - block for some number of seconds
sleep EXPR
sleep
Causes the script to sleep for
EXPR seconds, or forever if no
EXPR.
May be interrupted if the process receives a signal such as SIGALRM.
Returns the number of seconds actually slept. You probably cannot
mix alarm and sleep calls, because sleep is often implemented
using alarm.
On some older systems, it may sleep up to a full second less than what you requested, depending on how it counts seconds. Most modern systems always sleep the full amount. They may appear to sleep longer than that, however, because your process might not be scheduled right away in a busy multitasking system.
For delays of finer granularity than one second, you may use Perl's
syscall interface to access setitimer(2) if your system supports
it, or else see select in the perlfunc manpage above. The Time::HiRes module from
CPAN
may also help.
See also the
POSIX module's pause function.
|
sleep - block for some number of seconds |