1 files changed, 92 insertions, 0 deletions
diff --git a/src/include/spinlock.h b/src/include/spinlock.h
new file mode 100644
index 000000000..3f12bdc00
--- /dev/null
+++ b/src/include/spinlock.h
@@ -0,0 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 SUSE LINUX GmbH
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ * @author Jesse Williamson <jwilliamson@suse.de>
+ *
+*/
+
+#ifndef CEPH_SPINLOCK_HPP
+#define CEPH_SPINLOCK_HPP
+
+#include <atomic>
+
+namespace ceph {
+inline namespace version_1_0 {
+
+class spinlock;
+
+inline void spin_lock(std::atomic_flag& lock);
+inline void spin_unlock(std::atomic_flag& lock);
+inline void spin_lock(ceph::spinlock& lock);
+inline void spin_unlock(ceph::spinlock& lock);
+
+/* A pre-packaged spinlock type modelling BasicLockable: */
+class spinlock final
+{
+  std::atomic_flag af = ATOMIC_FLAG_INIT;
+
+  public:
+  void lock() {
+    ceph::spin_lock(af);
+  }
+ 
+  void unlock() noexcept {
+    ceph::spin_unlock(af);
+  }
+};
+
+// Free functions:
+inline void spin_lock(std::atomic_flag& lock)
+{
+ while(lock.test_and_set(std::memory_order_acquire))
+  ;
+}
+
+inline void spin_unlock(std::atomic_flag& lock)
+{
+ lock.clear(std::memory_order_release);
+}
+
+inline void spin_lock(std::atomic_flag *lock)
+{
+ spin_lock(*lock);
+}
+
+inline void spin_unlock(std::atomic_flag *lock)
+{
+ spin_unlock(*lock);
+}
+
+inline void spin_lock(ceph::spinlock& lock)
+{
+ lock.lock();
+}
+
+inline void spin_unlock(ceph::spinlock& lock)
+{
+ lock.unlock();
+}
+
+inline void spin_lock(ceph::spinlock *lock)
+{
+ spin_lock(*lock);
+}
+
+inline void spin_unlock(ceph::spinlock *lock)
+{
+ spin_unlock(*lock);
+}
+
+} // inline namespace (version)
+} // namespace ceph
+
+#endif