Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/src/rocksdb/util/thread_guard.h b/src/rocksdb/util/thread_guard.h
new file mode 100644
index 000000000..b2bb06a1b
--- /dev/null
+++ b/src/rocksdb/util/thread_guard.h
@@ -0,0 +1,41 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+
+#include "port/port.h"
+#include "rocksdb/rocksdb_namespace.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+// Resource management object for threads that joins the thread upon
+// destruction. Has unique ownership of the thread object, so copying it is not
+// allowed, while moving it transfers ownership.
+class ThreadGuard {
+ public:
+  ThreadGuard() = default;
+
+  explicit ThreadGuard(port::Thread&& thread) : thread_(std::move(thread)) {}
+
+  ThreadGuard(const ThreadGuard&) = delete;
+  ThreadGuard& operator=(const ThreadGuard&) = delete;
+
+  ThreadGuard(ThreadGuard&&) noexcept = default;
+  ThreadGuard& operator=(ThreadGuard&&) noexcept = default;
+
+  ~ThreadGuard() {
+    if (thread_.joinable()) {
+      thread_.join();
+    }
+  }
+
+  const port::Thread& GetThread() const { return thread_; }
+  port::Thread& GetThread() { return thread_; }
+
+ private:
+  port::Thread thread_;
+};
+
+}  // namespace ROCKSDB_NAMESPACE