Re: How to create Persistent zval?

By the way, Is this the reason of date ext always check the global HashTable and re-initialize the tzdata in every request? Lin Yo-An <cornelius.howl@gmail.com> 於 2014年1月19日星期日寫道： > > > Daniel Lowrey <rdlowrey@php.net <javascript:_e({}, 'cvml', > 'rdlowrey@php.net');>> 於 2014年1月19日星期日寫道： > >> >> Hello, >> >> >> >> I am trying to store a zval object into the persistent list in zend VM. >> >> (Using EG(persistent_list) and zend_rscd_list_entry) >> >> >> >> Which works fine if I store/fetch the zval in the same request context. >> >> >> >> But it seems that zend engine cleans up the zval object after the >> request, >> >> when the next request comes, the fetched list entry points to a freed >> zval >> >> address and it makes php segmentationfault. I guess zval is allocated >> by >> >> emalloc, so I cant keep it cross requests? >> >> > For persistent alloc, you should use pemalloc() , which is just a >> > wrapper leading to libc's malloc. >> > If you use emalloc() , the Zend Memory Manager will free the storage >> > at the end of the request, thus leading to use-after-free crash if you >> > reuse your pointer on a next request. >> >> --- Disclaimer --- >> I'm passing this along; Joe is having technical difficulties and asked for >> help sending this to the list. I provide no warranties or refunds ;) >> --- >> >> All zvals passed into the engine must be allocated by the mm, you cannot >> pemalloc anything and pass it into the engine safely. >> >> You don't want to store a persistent zval, you want to store a persistent >> resource entry, which should be allocated with pemalloc(size, 1) >> >> The reason for this is when cleaning up, the engine has no means by which >> to tell if a zval has been pemalloc or emalloc'd, zval_ptr_dtor works the >> same for everything. > > > > Thank you so much! That is what i was guessing.. - ref cnt and pemalloc > does not work for persistent zval. > > And zend engine cleans up zvals at the end of request no matter the ref > cnt is? > > so zval is not persistent, then is HashTable persistent? > > It's because I need to store a zval object which has several properties. > Is there a way to do make the object persistent? Or do i need to serialize > it just like apc? > > > >> Cheers >> Joe >> > > > -- > Best Regards, > > Yo-An Lin > > -- Sent from Gmail Mobile