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Date: Sat, 19 Apr 2003 03:20:34 -0400
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Subject: Sharing resources between modules
From: marshall@magpcss.com ("Marshall A. Greenblatt")

Hi guys, a quick question:

Is it possible for one module to retrieve the resource structure registered
by another module?

For instance, assume that we have two loaded PHP modules, `php_a.so' and
`php_b.so'.  A script calls a PHP function defined in `php_a.so'.  That
function creates a structure, calls zend_register_resource(), and returns
the resource ID.  That same script then calls a PHP function defined in
`php_b.so' that accepts the resource ID as a parameter.  Would it be
possible for the function in `php_b.so' to retrieve the structure associated
with the resource ID registered in `php_a.so'?


My thinking is that something like the following (semi-psudocode) should
work:

In the `php_a.so' function, which creates the resource:

   zval *myzvalp;
   mystruct *mystructp = emalloc(sizeof(mystruct));

   MAKE_STD_ZVAL(myzvalp);
   zend_register_resource(myzvalp, mystructp, "my structure");

   RETURN_RESOURCE(myzvalp);


In the `php_b.so' function, which retrieves the resource:

   int res_type;
   mystruct *mystructp;
   zval *myzvalp;

   [ get myzvalp from the parameter list ]

   res_type = zend_fetch_list_dtor_id("my structure");
   mystructp = (mystruct*)zend_fetch_resource(&myzvalp TSRMLS_CC,
                                              -1, "my structure",
                                              NULL, 1, res_type);
   if(mystructp) {
      [ mystructp should be the same as allocated in `php_a.so' ]
   }


However, I see the `TSRMLS_CC' value in the zend_fetch_resource() call and
this makes me wonder if zend_fetch_resource() is using something specific to
the current module.  Also, I'm guessing at the use of the
zend_fetch_list_dtor_id() function, so any suggestions about a more
appropriate way to do this (or a pointer to code where this is currently
being done) would be appreciated.

Thanks,
  Marshall