SLEEP(2) System Calls Manual SLEEP(2)NAME
sleep, alarm - delay, ask for delayed note
SYNOPSIS
#include <u.h>
#include <libc.h>
int sleep(long millisecs)
long alarm(unsigned long millisecs)
DESCRIPTION
Sleep suspends the current process for the number of milliseconds specified by the argument. The actual suspension time may be a little
more or less than the requested time. If millisecs is 0, the process gives up the CPU if another process is waiting to run, returning imme-
diately if not. Sleep returns -1 if interrupted, 0 otherwise.
Alarm causes an alarm note (see notify(2)) to be sent to the invoking process after the number of milliseconds given by the argument. Suc-
cessive calls to alarm reset the alarm clock. A zero argument clears the alarm. The return value is the amount of time previously remain-
ing in the alarm clock.
SOURCE
/sys/src/libc/9syscall
SEE ALSO intro(2)DIAGNOSTICS
These functions set errstr.
SLEEP(2)
Check Out this Related Man Page
alarm(2) System Calls Manual alarm(2)NAME
alarm - set a process's alarm clock
SYNOPSIS DESCRIPTION
instructs the alarm clock of the calling process to send the signal to the calling process after the number of real-time seconds specified
by sec have elapsed; see signal(5). Specific implementations might place limitations on the maximum supported alarm time. The constant
defined in specifies the implementation-specific maximum. Whenever sec is greater that this maximum, it is silently rounded down to it.
On all implementations, is guaranteed to be at least 31 days (in seconds).
Alarm requests are not stacked; successive calls reset the alarm clock of the calling process.
If sec is 0, any previously made alarm request is canceled.
Alarms are not inherited by a child process across a but are inherited across an
On systems that support the and system calls, the timer mechanism used by is the same as that used by Thus successive calls to and set and
return the state of a single timer. In addition, sets the timer interval to zero.
RETURN VALUE
returns the amount of time previously remaining in the alarm clock of the calling process.
WARNINGS
In some implementations, error bounds for alarm are -1, +0 seconds (for the posting of the alarm, not the restart of the process). Thus a
delay of 1 second can return immediately. The routine can be used to create a more precise delay.
SEE ALSO sleep(1), exec(2), getitimer(2), pause(2), signal(5), sleep(3C).
STANDARDS CONFORMANCE alarm(2)
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