Added object_cache_set_minimum_reserve() which sets the minimal number

of free objects an object cache should try to have ready. If the number
of free objects drops below the threshold, a new urgent priority thread
is asked to asynchronously resize the object cache (pretty similar to
the heap grower thread). Such a mechanism is necessary for code paths
that are supposed to free pages, but may need memory themselves (like
the swap support).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27100 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/slab/Slab.h

@@ -46,6 +46,9 @@ object_cache *create_object_cache_etc(const char *name, size_t object_size,
 
 void delete_object_cache(object_cache *cache);
 
+status_t object_cache_set_minimum_reserve(object_cache *cache,
+	size_t objectCount);
+
 void *object_cache_alloc(object_cache *cache, uint32 flags);
 void object_cache_free(object_cache *cache, void *object);