hello,

  when accessing a shared memory region that i don't have access to (because of the permissions), php segfaults.
  so if i have a shared memory region created by another user with key 0x123 and permissions 0600 and call shm_attach(0x123), php crashes:
	<?
		$shmid = shm_attach(0x123);
		shm_detach(0x123);
	?>

  also, i know some more info concerning the bug #8985: when one process is reading some variable from the shared memory and some other is writing _another_ variable to the same shared memory region, the data gets corrupted - possibly because of the reorganizing before each shm_put_var(). while this is understandable (shm_put_var() first removes the variable, reorganizes the region and writes the variable back), it renders this extension almost unusable in multitasking environments because a big global lock for the whole shared memory region is needed.
  i can supply more information if needed of course.

	thanks,
		Michal Vitecek