From: henrique dot grolli at gmail dot com
Operating system: Slackware Linux
PHP version: 5.2.6
PHP Bug Type: Filesystem function related
Bug description: Problems with file_exists and multiple instances
Description:
------------
Well, better explained when seeing the code.
Not acting as expected via web browser as the both instances execute as
the lock file was not created by another instance but doing it well via
shell console.
Same problem using clearstatcache() function.
Reproduce code:
---------------
// LOCK_FILE was defined to /tmp/test.lock
// creating the lock file
if(file_exists(LOCK_FILE)) {
echo "ANOTHER INSTANCE RUNNING\n";
exit(1);
}
else {
touch(LOCK_FILE);
}
/* any action that takes time*/
echo "running\n";
sleep(5); // simulating slow scripts
echo "done\n";
if(file_exists(LOCK_FILE)) {
unlink(LOCK_FILE);
}
else {
echo "I think someone deleted the lock file\n";
}
Expected result:
----------------
To see "running\ndone\n" in one instance, and "ANOTHER INSTANCE RUNNING\n"
if another instance try to execute at the same time.
Actual result:
--------------
Via shell everything works as well but via web browser both instances run
as the lock file doesnt exist.
--
Edit bug report at http://bugs.php.net/?id=46197&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=46197&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=46197&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=46197&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=46197&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=46197&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=46197&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=46197&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=46197&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=46197&r=support
Expected behavior: http://bugs.php.net/fix.php?id=46197&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=46197&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=46197&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=46197&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46197&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=46197&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=46197&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=46197&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=46197&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=46197&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=46197&r=mysqlcfg
