Edit report at https://bugs.php.net/bug.php?id=65596&edit=1
ID: 65596
Updated by: johan...@php.net
Reported by: ukrtelecom at gmail dot com
Summary: usleep prevents script timeout
-Status: Wont fix
+Status: Not a bug
Type: Bug
Package: *General Issues
Operating System: Linux
PHP Version: 5.4Git-2013-08-30 (snap)
Block user comment: N
Private report: N
New Comment:
What happens depends on the operating system, in general we tr tomeasure the
time spent on cpu, not the time elapsed.
On systems which have setitimer (Linux and other unixes) we use setitimer with
ITIMER_PROF, which, in my linux system's man page is documented as
ITIMER_PROF decrements both when the process executes and when the
system is executing on behalf of the process.
During sleep nothing is being executed.
Previous Comments:
------------------------------------------------------------------------
[2013-08-30 18:26:45] anon at anon dot anon
@ab Well of course it's solvable.
1. sleepTime = min(specifiedTime, timeLimit - scriptTime)
2. Do system call.
3. scriptTime += sleepTime
I don't understand why you track script time in such a bizarre fashion that it
somehow doesn't contribute to the time limit anyway.
------------------------------------------------------------------------
[2013-08-30 18:00:25] a...@php.net
This is unsolvable in PHP, sleep is a system call so it will suspend the
execution
. It can be only interrupted by a signal which can't be thrown from PHP because
the execution is suspended :)
------------------------------------------------------------------------
[2013-08-30 15:47:44] ukrtelecom at gmail dot com
Description:
------------
Usleeped time does not count in total timeout time.
Commenting out line 11 "usleep(10)" in the test script results with expected
Fatal timeout in 2 seconds.
Enabling line 11 "usleep(10)" makes script exit by condition in 50 seconds.
Increasing waiting time to 100 seconds in line 2 results with timeout Fatal
error in 60-70 sec.
PHP 5.4.20-dev (cli) (built: Aug 30 2013 14:18:16)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
./configure --disable-libxml --disable-xml --disable-simplexml --disable-
xmlreader --disable-xmlwriter --disable-dom --without-pear
OS Ubuntu 12.04 LTS
Linux precise64 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
Test script:
---------------
<?php
$wait = 50;
echo ini_get('max_execution_time');
set_time_limit(2);
$ts = time();
while(true) {
// usleep for 10 microseconds
usleep(10);
if ((time()- $ts) > $wait) {
echo time() -$ts;
echo "\n\nFailed! " . ini_get('max_execution_time') . "\n";
break;
}
}
Expected result:
----------------
0
Fatal error: Maximum execution time of 2 seconds exceeded in
/home/vagrant/t.php
on line 12
Actual result:
--------------
#with wait time 50 sec:
$ date; php t.php ; date
Fri Aug 30 15:40:54 UTC 2013
0
51
Failed! 2
Fri Aug 30 15:41:45 UTC 2013
#with wait time 100 sec:
$ date; php t.php ; date
Fri Aug 30 15:35:45 UTC 2013
0
Fatal error: Maximum execution time of 2 seconds exceeded in
/home/vagrant/t.php
on line 12
Fri Aug 30 15:36:40 UTC 2013
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=65596&edit=1
