ALARM(3F)ALARM(3F)NAMEalarm - execute a subroutine after a specified time
SYNOPSIS
integer*4 function alarm (time, sbrtn)
integer*4 time
external sbrtn
USAGE
integer*4 time /8/
external sbrtn
nseconds = alarm(time,sbrtn)
DESCRIPTION
This routine arranges for subroutine sbrtn to be called after time sec‐
onds. If time is 0, the alarm is turned off, and no routine is called.
The returned value is the time remaining on the last alarm.
RESTRICTIONS
A subroutine cannot pass its own name to alarm.
The alarm routine generates signals that could interfere with any I/O.
The called routine, sbrtn, must not do any I/O itself.
Calling alarm() from a parallelized or multi-threaded program may have
unpredictable results.
FILES
libfui.a
SEE ALSOalarm(2), sleep(3F), signal(3F)
03/02/25 ALARM(3F)