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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
commit483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch)
treee5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/include/spinlock.h
parentInitial commit. (diff)
downloadceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.tar.xz
ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.zip
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/include/spinlock.h')
-rw-r--r--src/include/spinlock.h92
1 files changed, 92 insertions, 0 deletions
diff --git a/src/include/spinlock.h b/src/include/spinlock.h
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+++ b/src/include/spinlock.h
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+// -*- 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