USLEEP(3) BSD Library Functions Manual USLEEP(3)NAME
usleep -- suspend thread execution for an interval measured in microseconds
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
usleep(useconds_t microseconds);
DESCRIPTION
The usleep() function suspends execution of the calling thread until either microseconds microseconds have elapsed or a signal is delivered
to the thread and its action is to invoke a signal-catching function or to terminate the process. System activity or limitations may
lengthen the sleep by an indeterminate amount.
This function is implemented using nanosleep(2) by pausing for microseconds microseconds or until a signal occurs. Consequently, in this
implementation, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM. Also, this implementa-
tion does not put a limit on the value of microseconds (other than that limited by the size of the useconds_t type); some other platforms
require it to be less than one million.
NOTE
The usleep() function is obsolescent. Use nanosleep(2) instead.
RETURN VALUES
The usleep() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The usleep() function will fail if:
[EINTR] A signal was delivered to the process and its action was to invoke a signal-catching function.
SEE ALSO nanosleep(2), sleep(3)HISTORY
The usleep() function appeared in 4.3BSD.
BSD February 13, 1998 BSD
Check Out this Related Man Page
SLEEP(3) BSD Library Functions Manual SLEEP(3)NAME
sleep -- suspend thread execution for an interval measured in seconds
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
unsigned int
sleep(unsigned int seconds);
DESCRIPTION
The sleep() function suspends execution of the calling thread until either seconds seconds have elapsed or a signal is delivered to the
thread and its action is to invoke a signal-catching function or to terminate the thread or process. System activity may lengthen the sleep
by an indeterminate amount.
This function is implemented using nanosleep(2) by pausing for seconds seconds or until a signal occurs. Consequently, in this implementa-
tion, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM.
RETURN VALUES
If the sleep() function returns because the requested time has elapsed, the value returned will be zero. If the sleep() function returns due
to the delivery of a signal, the value returned will be the unslept amount (the requested time minus the time actually slept) in seconds.
SEE ALSO nanosleep(2), usleep(3)STANDARDS
The sleep() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
HISTORY
A sleep() function appeared in Version 7 AT&T UNIX.
BSD February 13, 1998 BSD
Hi,
I'm using the command usleep (500000) when compiling C++ on the SunOS platform, but it does not compile on a OSF1 platform?
Any ideas?
Thanks (5 Replies)
Hello,
Can anyone, please, guide me on the use of nanosleep. I'm learning threads. I want to introduce a delay (not nested for loops, something more customizable). Nanosleep looked useful (or any other form of customizable and easy-to-use delay). Sleep is too long. :) (2 Replies)
Hi,
I have encountered the following problem on Solaris 10:
I have a thread that is asleep on nanosleep (set to 24 hours).
Something that happens on another thread, causes the nanosleep to exit, even though the time has not elapsed.
The returned value is 0 (so it doesn't look like it... (1 Reply)
Hi All,
I need usleep command to use in one of my shell script. I am working on SunOS 5.9. Where usleep command is not available. Is there any way to use usleep command in SunOS.
Thanks In Advance,
chidhu (5 Replies)
Hi ,
How can I use floating point argument for sleep command in unix.I cannot use usleep as it is not suppported.
Also how can I find out that a file is in use at that particular instant only.(wether it is being read or written) (7 Replies)
Hi @ll :)
I have a problem with my code but first a short description:
1. I have one signal call SIGUSR1
2. In the signal I try to use nanosleep and now:
When I put kill -SIGUSR1 pid --> sometimes works fine, sometimes returns me an error with ,,Interrupt system call", sometimes I got... (5 Replies)