1 files changed, 70 insertions, 0 deletions
diff --git a/src/seastar/include/seastar/core/shared_ptr_debug_helper.hh b/src/seastar/include/seastar/core/shared_ptr_debug_helper.hh
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+++ b/src/seastar/include/seastar/core/shared_ptr_debug_helper.hh
@@ -0,0 +1,70 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2015 Cloudius Systems, Ltd.
+ */
+
+#pragma once
+
+#ifdef SEASTAR_DEBUG_SHARED_PTR
+
+#include <thread>
+#include <cassert>
+
+namespace seastar {
+
+// A counter that is only comfortable being incremented on the cpu
+// it was created on.  Useful for verifying that a shared_ptr
+// or lw_shared_ptr isn't misued across cores.
+class debug_shared_ptr_counter_type {
+    long _counter = 0;
+    std::thread::id _cpu = std::this_thread::get_id();
+public:
+    debug_shared_ptr_counter_type(long x) : _counter(x) {}
+    operator long() const {
+        check();
+        return _counter;
+    }
+    debug_shared_ptr_counter_type& operator++() {
+        check();
+        ++_counter;
+        return *this;
+    }
+    long operator++(int) {
+        check();
+        return _counter++;
+    }
+    debug_shared_ptr_counter_type& operator--() {
+        check();
+        --_counter;
+        return *this;
+    }
+    long operator--(int) {
+        check();
+        return _counter--;
+    }
+private:
+    void check() const {
+        assert(_cpu == std::this_thread::get_id());
+    }
+};
+
+}
+
+#endif
+