intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 34 insertions, 0 deletions

diff --git a/library/cpp/messagebus/misc/atomic_box.h b/library/cpp/messagebus/misc/atomic_box.h
new file mode 100644
index 0000000000..401621f933
--- /dev/null
+++ b/library/cpp/messagebus/misc/atomic_box.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <util/system/atomic.h>
+
+// TAtomic with human interface
+template <typename T>
+class TAtomicBox {
+private:
+    union {
+        TAtomic Value;
+        // when T is enum, it is convenient to inspect its content in gdb
+        T ValueForDebugger;
+    };
+
+    static_assert(sizeof(T) <= sizeof(TAtomic), "expect sizeof(T) <= sizeof(TAtomic)");
+
+public:
+    TAtomicBox(T value = T())
+        : Value(value)
+    {
+    }
+
+    void Set(T value) {
+        AtomicSet(Value, (TAtomic)value);
+    }
+
+    T Get() const {
+        return (T)AtomicGet(Value);
+    }
+
+    bool CompareAndSet(T expected, T set) {
+        return AtomicCas(&Value, (TAtomicBase)set, (TAtomicBase)expected);
+    }
+};