pk
Sun Sep  7 14:19:45 PDT 1997
Update of /cvsroot/src/sys/vm
In directory netbsd1:/var/slash-tmp/cvs-serv4118

Modified Files:
	vm_object.c 
Log Message:
vm_object_deallocate():
	Unlock the object cache before looking for collapse candidates.
	Use vm_object_lock_try() to obtain a lock on a collapse candidate.
	This avoids a deadlock due to recursively entering
	vm_object_deallocate() in case a backing object goes away.

vm_object_collapse() and helper functions:
	The object passed in is locked; make sure it is locked when
	we leave vm_object_collapse().

   XXX: Currently, the object is not unlocked during while we possibly
	wait for pager data. We need to consider the effects of
	simultaneous calls to vm_object_collapse() on the same object
	in case unlocking is necessary.