From: ian at snork dot net Operating system: Debian woody (i386) PHP version: 5.0.3 PHP Bug Type: Filesystem function related Bug description: Non-blocking flock() broken
Description: ------------ This code works in PHP 4.3.0, but does not in PHP 5.0.3. When invoked, it will try to lock /tmp/test1, /tmp/test2 or /tmp/test3 for exclusive use, whichever is free. If none are, it will wait a second before cycling through with another attempt. When running concurrently, the first invocation correctly picks up /tmp/test1; the second and subsequent ones just cycle forever. For some reason, the non-blocking flock() only sets $block the first time. Reproduce code: --------------- while (!sleep(1)) foreach (array("/tmp/test1", "/tmp/test2", "/tmp/test3") as $path) if (flock($handle = fopen($path, "w"), LOCK_EX | LOCK_NB, $block) and !$block) { echo "Got $path\n"; sleep(10); echo "Releasing $path\n"; exit; } Expected result: ---------------- $ php5 flock_test.php & Got /tmp/test1 $ php5 flock_test.php & Got /tmp/test2 $ php5 flock_test.php & Got /tmp/test3 $ php5 flock_test.php & Releasing /tmp/test1 Got /tmp/test1 $ Actual result: -------------- $ php5 flock_test.php & Got /tmp/test1 $ php5 flock_test.php & $ php5 flock_test.php & $ php5 flock_test.php & $ -- Edit bug report at http://bugs.php.net/?id=31363&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=31363&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=31363&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=31363&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=31363&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=31363&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=31363&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=31363&r=needscript Try newer version: http://bugs.php.net/fix.php?id=31363&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=31363&r=support Expected behavior: http://bugs.php.net/fix.php?id=31363&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=31363&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=31363&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=31363&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=31363&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=31363&r=dst IIS Stability: http://bugs.php.net/fix.php?id=31363&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=31363&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=31363&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=31363&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=31363&r=mysqlcfg