intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 33 insertions, 0 deletions

diff --git a/contrib/libs/jemalloc/reg_zone.cpp b/contrib/libs/jemalloc/reg_zone.cpp
new file mode 100644
index 00000000000..6a7b9d69e1f
--- /dev/null
+++ b/contrib/libs/jemalloc/reg_zone.cpp
@@ -0,0 +1,33 @@
+#include <util/system/compiler.h>
+
+extern "C" void je_zone_register();
+
+static volatile bool initialized = false;
+
+namespace {
+    struct TInit {
+        inline TInit() {
+            if (!initialized) {
+                je_zone_register();
+                initialized = true;
+            }
+        }
+    };
+
+    void zone_register() {
+        static TInit init;
+    }
+}
+
+extern "C" {
+    void je_assure_zone_register() {
+        if (Y_LIKELY(initialized)) {
+            return;
+        }
+
+        // Even if we have read false "initialized", real init will be syncronized once by
+        // Meyers singleton in <anonymous>::register_zone(). We could do a few
+        // redundant "initialized" and singleton creation checks, but no more than that.
+        zone_register();
+    }
+}