Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/bdwgc/tests/middle.c

@@ -0,0 +1,25 @@
+/*
+ * Test at the boundary between small and large objects.
+ * Inspired by a test case from Zoltan Varga.
+ */
+#include "gc.h"
+#include <stdio.h>
+
+int main (void)
+{
+  int i;
+
+  GC_set_all_interior_pointers(0);
+  GC_INIT();
+
+  for (i = 0; i < 20000; ++i) {
+    (void)GC_malloc_atomic(4096);
+    (void)GC_malloc(4096);
+  }
+  for (i = 0; i < 20000; ++i) {
+    (void)GC_malloc_atomic(2048);
+    (void)GC_malloc(2048);
+  }
+  printf("Final heap size is %lu\n", (unsigned long)GC_get_heap_size());
+  return 0;
+}