Adding upstream version 14.2.21.upstream/14.2.21upstream

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

1 files changed, 57 insertions, 0 deletions

diff --git a/src/common/shared_mutex_debug.h b/src/common/shared_mutex_debug.h
new file mode 100644
index 00000000..57d95b0c
--- /dev/null
+++ b/src/common/shared_mutex_debug.h
@@ -0,0 +1,57 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include <pthread.h>
+#include <atomic>
+
+#include "common/mutex_debug.h"
+
+namespace ceph {
+
+class shared_mutex_debug :
+    public ceph::mutex_debug_detail::mutex_debugging_base
+{
+  pthread_rwlock_t rwlock;
+  const bool track;
+  const bool lockdep;
+  std::atomic<unsigned> nrlock{0};
+
+public:
+  // Mutex concept is DefaultConstructible
+  shared_mutex_debug()
+    : shared_mutex_debug{std::string{}}
+  {}
+  shared_mutex_debug(const std::string& n,
+		     bool track_lock=true,
+		     bool enable_lock_dep=true,
+		     bool prioritize_write=false);
+  // exclusive locking
+  void lock();
+  bool try_lock();
+  void unlock();
+  bool is_wlocked() const {
+    return nlock > 0;
+  }
+  // shared locking
+  void lock_shared();
+  bool try_lock_shared();
+  void unlock_shared();
+  bool is_rlocked() const {
+    return nrlock > 0;
+  }
+  // either of them
+  bool is_locked() const {
+    return nlock > 0 || nrlock > 0;
+  }
+private:
+  // exclusive locking
+  void _pre_unlock();
+  void _post_lock();
+  // shared locking
+  void _pre_unlock_shared();
+  void _post_lock_shared();
+};
+
+} // namespace ceph