Edit report at http://bugs.php.net/bug.php?id=53071&edit=1
ID: 53071 Updated by: cataphr...@php.net Reported by: chris dot crapo at bsci dot com Summary: Use of SPLObjectStorage Defeats gc_collect_cycles Status: Closed Type: Bug Package: SPL related Operating System: Windows XP PHP Version: 5.3.3 Assigned To: cataphract Block user comment: N New Comment: This bug has been fixed in SVN. Snapshots of the sources are packaged every three hours; this change will be in the next snapshot. You can grab the snapshot at http://snaps.php.net/. Thank you for the report, and for helping us make PHP better. Fixed for PHP 5.3 and trunk. Previous Comments: ------------------------------------------------------------------------ [2010-10-25 03:41:57] cataphr...@php.net Automatic comment from SVN on behalf of cataphract Revision: http://svn.php.net/viewvc/?view=revision&revision=304723 Log: - Fixed bug #53071 (SPLObjectStorage defeats gc_collect_cycles). ------------------------------------------------------------------------ [2010-10-15 01:33:10] chris dot crapo at bsci dot com //Cycle example: class myClass { public $member; } function LimitedScope() { $myA = new myClass(); $myB = new SplObjectStorage(); $myC = new myClass(); $myC->member = $myA; // myC has a referece to myA $myB->Attach($myC); // myB attaches myC $myA->member = $myB; // myA has myB, comleting the cycle } echo "Memory used: ".$mem = memory_get_usage()."\n"; echo "Function Call\n"; LimitedScope(); echo "Memory used: ".memory_get_usage()."\n"; echo "Cycles culled: ".gc_collect_cycles()." should be 1\n"; echo "Memory used: ".memory_get_usage()." should be {$mem}"; ------------------------------------------------------------------------ [2010-10-15 01:14:53] chris dot crapo at bsci dot com Description: ------------ Using SPLObjectStorage objects in a cycle will defeat gc_collect_cycles ability to detect that cycle. So, if I have an object ParentObject which has an SPLObjectStorage which attaches a ChildObject that has a reference back to ParentObject, the garbage collector will never actually collect ParentObject. Expected result: ---------------- After calling gc_collect_cycles() old objects that no longer have references should be collected Actual result: -------------- Cycles that have SPLObjectStorage in them are not collected ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=53071&edit=1
