1 files changed, 21 insertions, 0 deletions
diff --git a/src/malloc.c b/src/malloc.c
index 932cecc21..9a2eaeec1 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -211,6 +211,27 @@ sqlite3_int64 sqlite3_memory_highwater(int resetFlag){
   return mx;
 }
 
+#if 0
+/*
+** Return an estimate of the amount of unallocated memory.
+**
+** This the hard heap limit minus the current memory usage.  It might
+** not be possible to allocate this much memory all at once.  This is
+** only an estimate.
+*/
+sqlite3_int64 sqlite3EstMemoryAvailable(void){
+  sqlite3_int64 n;
+  sqlite3_mutex_enter(mem0.mutex);
+  n = mem0.alarmThreshold;
+  if( n<=0 ) n = mem0.hardLimit;
+  sqlite3_mutex_leave(mem0.mutex);
+  if( n<=0 ) n = LARGEST_INT64;
+  n -= sqlite3_memory_used();
+  if( n<0 ) n = 0;
+  return n;
+}
+#endif
+
 /*
 ** Trigger the alarm 
 */