PCNTL Functions
If your process uses SIGALRM and sleep() at the same time, the alarm set could make sleep() to return prematurely.
To avoid this and ensure your process waits a number of seconds you could use a function or class similar to this one:
<?php
class SleepWorkaroundForSIGALRM {
private $time;
function __construct($seconds) {
$this->time = time() + $seconds;
while ($this->time >= time()) {
sleep(1);
}
}
?>
pcntl_alarm
(PHP 4 >= 4.3.0, PHP 5)
pcntl_alarm — Set an alarm clock for delivery of a signal
Description
int pcntl_alarm
( int
$seconds
)
Creates a timer that will send a SIGALRM signal to
the process after the given number of seconds.
Any call to pcntl_alarm() will cancel any previously
set alarm.
Parameters
-
seconds -
The number of seconds to wait. If
secondsis zero, no new alarm is created.
Return Values
Returns the time in seconds that any previously scheduled alarm had remaining before it was to be delivered, or 0 if there was no previously scheduled alarm.
add a note
User Contributed Notes
pcntl_alarm
thessoro at gmail dot com
20-Apr-2011 04:05
j at ukr-info dot net
19-Oct-2005 11:51
<?php
declare(ticks = 1);
function signal_handler($signal) {
print "Caught SIGALRM\n";
pcntl_alarm(5);
}
pcntl_signal(SIGALRM, "signal_handler", true);
pcntl_alarm(5);
for(;;) {
}
?>