Added new function vm_low_memory_state() that returns the current low

memory status.
Added new B_NO_LOW_MEMORY constant for the usual case.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15551 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/vm_low_memory.h

@@ -11,6 +11,7 @@
 
 /* warning levels for low memory handlers */
 enum {
+	B_NO_LOW_MEMORY = 0,
 	B_LOW_MEMORY_NOTE,
 	B_LOW_MEMORY_WARNING,
 	B_LOW_MEMORY_CRITICAL,
@@ -23,6 +24,7 @@ extern "C" {
 #endif
 
 status_t vm_low_memory_init(void);
+int32 vm_low_memory_state(void);
 void vm_low_memory(size_t requirements);
 
 // these calls might get public some day