sleep — sleep for a specified number of seconds
#include <unistd.h>
unsigned int
sleep( |
unsigned int seconds); |
sleep() causes the calling
thread to sleep either until the number of real-time seconds
specified in seconds
have elapsed or until a signal arrives which is not
ignored.
Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
sleep() |
Thread safety | MT-Unsafe sig:SIGCHLD/linux |
On Linux, sleep() is
implemented via nanosleep(2). See the
nanosleep(2) man page for a
discussion of the clock used.
On some systems, sleep()
may be implemented using alarm(2) and SIGALRM (POSIX.1 permits this); mixing
calls to alarm(2) and sleep() is a bad idea.
Using longjmp(3) from a signal
handler or modifying the handling of SIGALRM while sleeping will cause
undefined results.
This page is part of release 5.11 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) 1993 by Thomas Koenig (ig25rz.uni-karlsruhe.de) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END Modified Sat Jul 24 18:16:02 1993 by Rik Faith (faithcs.unc.edu) |