initial code repo

[stor4nfv.git] / src / ceph / src / include / Spinlock.h

diff --git a/src/ceph/src/include/Spinlock.h b/src/ceph/src/include/Spinlock.h
new file mode 100644 (file)
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+++ b/src/ceph/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) 2013 Inktank
+ *
+ * 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 Sage Weil <sage@inktank.com>
+ */
+
+#ifndef CEPH_SPINLOCK_H
+#define CEPH_SPINLOCK_H
+
+#include "acconfig.h"
+
+#include <pthread.h>
+
+typedef struct {
+#ifdef HAVE_PTHREAD_SPINLOCK
+  pthread_spinlock_t lock;
+#else
+  pthread_mutex_t lock;
+#endif
+} ceph_spinlock_t;
+
+#ifdef HAVE_PTHREAD_SPINLOCK
+
+static inline int ceph_spin_init(ceph_spinlock_t *l)
+{
+  return pthread_spin_init(&l->lock, PTHREAD_PROCESS_PRIVATE);
+}
+
+static inline int ceph_spin_destroy(ceph_spinlock_t *l)
+{
+  return pthread_spin_destroy(&l->lock);
+}
+
+static inline int ceph_spin_lock(ceph_spinlock_t *l)
+{
+  return pthread_spin_lock(&l->lock);
+}
+
+static inline int ceph_spin_unlock(ceph_spinlock_t *l)
+{
+  return pthread_spin_unlock(&l->lock);
+}
+
+#else /* !HAVE_PTHREAD_SPINLOCK */
+
+static inline int ceph_spin_init(ceph_spinlock_t *l)
+{
+  return pthread_mutex_init(&l->lock, NULL);
+}
+
+static inline int ceph_spin_destroy(ceph_spinlock_t *l)
+{
+  return pthread_mutex_destroy(&l->lock);
+}
+
+static inline int ceph_spin_lock(ceph_spinlock_t *l)
+{
+  return pthread_mutex_lock(&l->lock);
+}
+
+static inline int ceph_spin_unlock(ceph_spinlock_t *l)
+{
+  return pthread_mutex_unlock(&l->lock);
+}
+
+#endif
+
+class Spinlock {
+  mutable ceph_spinlock_t _lock;
+
+public:
+  Spinlock() {
+    ceph_spin_init(&_lock);
+  }
+  ~Spinlock() {
+    ceph_spin_destroy(&_lock);
+  }
+
+  // don't allow copying.
+  void operator=(Spinlock& s);
+  Spinlock(const Spinlock& s);
+
+  /// acquire spinlock
+  void lock() const {
+    ceph_spin_lock(&_lock);
+  }
+  /// release spinlock
+  void unlock() const {
+    ceph_spin_unlock(&_lock);
+  }
+
+  class Locker {
+    const Spinlock& spinlock;
+  public:
+    Locker(const Spinlock& s) : spinlock(s) {
+      spinlock.lock();
+    }
+    ~Locker() {
+      spinlock.unlock();
+    }
+  };
+};
+
+#endif