gc.c: rb_gc_adjust_memory_usage

* gc.c (rb_gc_adjust_memory_usage): notify memory usage to the GC
  engine by extension libraries, to trigger GC.  [Feature #12690]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index af43b0453b..c90fc71c0d 100644
--- a/gc.c
+++ b/gc.c
@@ -8096,6 +8096,18 @@ gc_malloc_allocations(VALUE self)
 }
 #endif
 
+void
+rb_gc_adjust_memory_usage(ssize_t diff)
+{
+    rb_objspace_t *objspace = &rb_objspace;
+    if (diff > 0) {
+	objspace_malloc_increase(objspace, 0, diff, 0, MEMOP_TYPE_REALLOC);
+    }
+    else if (diff < 0) {
+	objspace_malloc_increase(objspace, 0, 0, -diff, MEMOP_TYPE_REALLOC);
+    }
+}
+
 /*
   ------------------------------ WeakMap ------------------------------
 */