diff --git a/src/common/async/shared_mutex.h b/src/common/async/shared_mutex.h
deleted file mode 100644
index f71928fd833..00000000000
--- a/src/common/async/shared_mutex.h
+++ /dev/null
@@ -1,428 +0,0 @@
-// -*- 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) 2018 Red Hat
- *
- * 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.
- *
- */
-
-#ifndef CEPH_ASYNC_SHARED_MUTEX_H
-#define CEPH_ASYNC_SHARED_MUTEX_H
-
-#include <condition_variable>
-#include <mutex>
-#include <shared_mutex> // for std::shared_lock
-
-#include <boost/intrusive/list.hpp>
-
-#include "common/async/completion.h"
-
-namespace ceph::async {
-
-/**
- * An asynchronous shared mutex for use with boost::asio.
- *
- * A shared mutex class with asynchronous lock operations that complete on a
- * boost::asio executor. The class also has synchronous interfaces that meet
- * most of the standard library's requirements for the SharedMutex concept,
- * which makes it compatible with lock_guard, unique_lock, and shared_lock.
- *
- * All lock requests can fail with operation_aborted on cancel() or destruction.
- * The non-error_code overloads of lock() and lock_shared() will throw this
- * error as an exception of type boost::system::system_error.
- *
- * Exclusive locks are prioritized over shared locks. Locks of the same type
- * are granted in fifo order. The implementation defines a limit on the number
- * of shared locks to 65534 at a time.
- *
- * Example use:
- *
- *   boost::asio::io_context context;
- *   SharedMutex mutex{context.get_executor()};
- *
- *   mutex.async_lock([&] (boost::system::error_code ec, auto lock) {
- *       if (!ec) {
- *         // mutate shared state ...
- *       }
- *     });
- *   mutex.async_lock_shared([&] (boost::system::error_code ec, auto lock) {
- *       if (!ec) {
- *         // read shared state ...
- *       }
- *     });
- *
- *   context.run();
- */
-template <typename Executor>
-class SharedMutex {
- public:
-  SharedMutex(const Executor& ex1);
-
-  /// on destruction, all pending lock requests are canceled
-  ~SharedMutex();
-
-  using executor_type = Executor;
-  executor_type get_executor() const noexcept { return ex1; }
-
-  /// initiate an asynchronous request for an exclusive lock. when the lock is
-  /// granted, the completion handler is invoked with a successful error code
-  /// and a std::unique_lock that owns this mutex.
-  /// Signature = void(boost::system::error_code, std::unique_lock)
-  template <typename CompletionToken>
-  auto async_lock(CompletionToken&& token);
-
-  /// wait synchronously for an exclusive lock. if an error occurs before the
-  /// lock is granted, that error is thrown as an exception
-  void lock();
-
-  /// wait synchronously for an exclusive lock. if an error occurs before the
-  /// lock is granted, that error is assigned to 'ec'
-  void lock(boost::system::error_code& ec);
-
-  /// try to acquire an exclusive lock. if the lock is not immediately
-  /// available, returns false
-  bool try_lock();
-
-  /// releases an exclusive lock. not required to be called from the same thread
-  /// that initiated the lock
-  void unlock();
-
-  /// initiate an asynchronous request for a shared lock. when the lock is
-  /// granted, the completion handler is invoked with a successful error code
-  /// and a std::shared_lock that owns this mutex.
-  /// Signature = void(boost::system::error_code, std::shared_lock)
-  template <typename CompletionToken>
-  auto async_lock_shared(CompletionToken&& token);
-
-  /// wait synchronously for a shared lock. if an error occurs before the
-  /// lock is granted, that error is thrown as an exception
-  void lock_shared();
-
-  /// wait synchronously for a shared lock. if an error occurs before the lock
-  /// is granted, that error is assigned to 'ec'
-  void lock_shared(boost::system::error_code& ec);
-
-  /// try to acquire a shared lock. if the lock is not immediately available,
-  /// returns false
-  bool try_lock_shared();
-
-  /// releases a shared lock. not required to be called from the same thread
-  /// that initiated the lock
-  void unlock_shared();
-
-  /// cancel any pending requests for exclusive or shared locks with an
-  /// operation_aborted error
-  void cancel();
-
- private:
-  Executor ex1; //< default callback executor
-
-  struct LockRequest : public boost::intrusive::list_base_hook<> {
-    virtual ~LockRequest() {}
-    virtual void complete(boost::system::error_code ec) = 0;
-    virtual void destroy() = 0;
-  };
-  using RequestList = boost::intrusive::list<LockRequest>;
-
-  RequestList shared_queue; //< requests waiting on a shared lock
-  RequestList exclusive_queue; //< requests waiting on an exclusive lock
-
-  /// lock state encodes the number of shared lockers, or 'max' for exclusive
-  using LockState = uint16_t;
-  static constexpr LockState Unlocked = 0;
-  static constexpr LockState Exclusive = std::numeric_limits<LockState>::max();
-  static constexpr LockState MaxShared = Exclusive - 1;
-  LockState state = Unlocked; //< current lock state
-
-  std::mutex mutex; //< protects lock state and wait queues
-
-  // sync requests live on the stack and wait on a condition variable
-  class SyncRequest;
-
-  // async requests use async::Completion to invoke a handler on its executor
-  template <template <typename Mutex> typename Lock>
-  class AsyncRequest;
-
-  using AsyncExclusiveRequest = AsyncRequest<std::unique_lock>;
-  using AsyncSharedRequest = AsyncRequest<std::shared_lock>;
-
-  void complete(RequestList&& requests, boost::system::error_code ec);
-};
-
-template <typename Executor>
-class SharedMutex<Executor>::SyncRequest : public LockRequest {
-  std::condition_variable cond;
-  std::optional<boost::system::error_code> ec;
- public:
-  boost::system::error_code wait(std::unique_lock<std::mutex>& lock) {
-    // return the error code once its been set
-    cond.wait(lock, [this] { return ec; });
-    return *ec;
-  }
-  void complete(boost::system::error_code ec) override {
-    this->ec = ec;
-    cond.notify_one();
-  }
-  void destroy() override {
-    // nothing, SyncRequests live on the stack
-  }
-};
-
-template <typename Executor>
-template <template <typename Mutex> typename Lock>
-class SharedMutex<Executor>::AsyncRequest : public LockRequest {
-  SharedMutex& mutex; //< mutex argument for lock guard
- public:
-  AsyncRequest(SharedMutex& mutex) : mutex(mutex) {}
-
-  using Signature = void(boost::system::error_code, Lock<SharedMutex>);
-  using LockCompletion = Completion<Signature, AsBase<AsyncRequest>>;
-
-  void complete(boost::system::error_code ec) override {
-    auto r = static_cast<LockCompletion*>(this);
-    // pass ownership of ourselves to post(). on error, pass an empty lock
-    post(std::unique_ptr<LockCompletion>{r}, ec,
-         ec ? Lock{mutex, std::defer_lock} : Lock{mutex, std::adopt_lock});
-  }
-  void destroy() override {
-    delete static_cast<LockCompletion*>(this);
-  }
-};
-
-
-template <typename Executor>
-inline SharedMutex<Executor>::SharedMutex(const Executor& ex1)
-  : ex1(ex1)
-{
-}
-
-template <typename Executor>
-inline SharedMutex<Executor>::~SharedMutex()
-{
-  try {
-    cancel();
-  } catch (const std::exception&) {
-    // swallow any exceptions, the destructor can't throw
-  }
-}
-
-template <typename Executor>
-template <typename CompletionToken>
-auto SharedMutex<Executor>::async_lock(CompletionToken&& token)
-{
-  using Signature = typename AsyncExclusiveRequest::Signature;
-  boost::asio::async_completion<CompletionToken, Signature> init(token);
-  auto& handler = init.completion_handler;
-  {
-    std::lock_guard lock{mutex};
-
-    if (state == Unlocked) {
-      state = Exclusive;
-
-      // post the completion
-      auto ex2 = boost::asio::get_associated_executor(handler, ex1);
-      auto alloc2 = boost::asio::get_associated_allocator(handler);
-      auto b = bind_handler(std::move(handler), boost::system::error_code{},
-                            std::unique_lock{*this, std::adopt_lock});
-      ex2.post(forward_handler(std::move(b)), alloc2);
-    } else {
-      // create a request and add it to the exclusive list
-      using LockCompletion = typename AsyncExclusiveRequest::LockCompletion;
-      auto request = LockCompletion::create(ex1, std::move(handler), *this);
-      exclusive_queue.push_back(*request.release());
-    }
-  }
-  return init.result.get();
-}
-
-template <typename Executor>
-inline void SharedMutex<Executor>::lock()
-{
-  boost::system::error_code ec;
-  lock(ec);
-  if (ec) {
-    throw boost::system::system_error(ec);
-  }
-}
-
-template <typename Executor>
-void SharedMutex<Executor>::lock(boost::system::error_code& ec)
-{
-  std::unique_lock lock{mutex};
-
-  if (state == Unlocked) {
-    state = Exclusive;
-    ec.clear();
-  } else {
-    SyncRequest request;
-    exclusive_queue.push_back(request);
-    ec = request.wait(lock);
-  }
-}
-
-template <typename Executor>
-inline bool SharedMutex<Executor>::try_lock()
-{
-  std::lock_guard lock{mutex};
-
-  if (state == Unlocked) {
-    state = Exclusive;
-    return true;
-  }
-  return false;
-}
-
-template <typename Executor>
-void SharedMutex<Executor>::unlock()
-{
-  RequestList granted;
-  {
-    std::lock_guard lock{mutex};
-    assert(state == Exclusive);
-
-    if (!exclusive_queue.empty()) {
-      // grant next exclusive lock
-      auto& request = exclusive_queue.front();
-      exclusive_queue.pop_front();
-      granted.push_back(request);
-    } else {
-      // grant shared locks, if any
-      state = shared_queue.size();
-      if (state > MaxShared) {
-        state = MaxShared;
-        auto end = std::next(shared_queue.begin(), MaxShared);
-        granted.splice(granted.end(), shared_queue,
-                       shared_queue.begin(), end, MaxShared);
-      } else {
-        granted.splice(granted.end(), shared_queue);
-      }
-    }
-  }
-  complete(std::move(granted), boost::system::error_code{});
-}
-
-template <typename Executor>
-template <typename CompletionToken>
-auto SharedMutex<Executor>::async_lock_shared(CompletionToken&& token)
-{
-  using Signature = typename AsyncSharedRequest::Signature;
-  boost::asio::async_completion<CompletionToken, Signature> init(token);
-  auto& handler = init.completion_handler;
-  {
-    std::lock_guard lock{mutex};
-
-    if (exclusive_queue.empty() && state < MaxShared) {
-      state++;
-
-      auto ex2 = boost::asio::get_associated_executor(handler, ex1);
-      auto alloc2 = boost::asio::get_associated_allocator(handler);
-      auto b = bind_handler(std::move(handler), boost::system::error_code{},
-                            std::shared_lock{*this, std::adopt_lock});
-      ex2.post(forward_handler(std::move(b)), alloc2);
-    } else {
-      using LockCompletion = typename AsyncSharedRequest::LockCompletion;
-      auto request = LockCompletion::create(ex1, std::move(handler), *this);
-      shared_queue.push_back(*request.release());
-    }
-  }
-  return init.result.get();
-}
-
-template <typename Executor>
-inline void SharedMutex<Executor>::lock_shared()
-{
-  boost::system::error_code ec;
-  lock_shared(ec);
-  if (ec) {
-    throw boost::system::system_error(ec);
-  }
-}
-
-template <typename Executor>
-void SharedMutex<Executor>::lock_shared(boost::system::error_code& ec)
-{
-  std::unique_lock lock{mutex};
-
-  if (exclusive_queue.empty() && state < MaxShared) {
-    state++;
-    ec.clear();
-  } else {
-    SyncRequest request;
-    shared_queue.push_back(request);
-    ec = request.wait(lock);
-  }
-}
-
-template <typename Executor>
-inline bool SharedMutex<Executor>::try_lock_shared()
-{
-  std::lock_guard lock{mutex};
-
-  if (exclusive_queue.empty() && state < MaxShared) {
-    state++;
-    return true;
-  }
-  return false;
-}
-
-template <typename Executor>
-inline void SharedMutex<Executor>::unlock_shared()
-{
-  std::lock_guard lock{mutex};
-  assert(state != Unlocked && state <= MaxShared);
-
-  if (state == 1 && !exclusive_queue.empty()) {
-    // grant next exclusive lock
-    state = Exclusive;
-    auto& request = exclusive_queue.front();
-    exclusive_queue.pop_front();
-    request.complete(boost::system::error_code{});
-  } else if (state == MaxShared && !shared_queue.empty() &&
-             exclusive_queue.empty()) {
-    // grant next shared lock
-    auto& request = shared_queue.front();
-    shared_queue.pop_front();
-    request.complete(boost::system::error_code{});
-  } else {
-    state--;
-  }
-}
-
-template <typename Executor>
-inline void SharedMutex<Executor>::cancel()
-{
-  RequestList canceled;
-  {
-    std::lock_guard lock{mutex};
-    canceled.splice(canceled.end(), shared_queue);
-    canceled.splice(canceled.end(), exclusive_queue);
-  }
-  complete(std::move(canceled), boost::asio::error::operation_aborted);
-}
-
-template <typename Executor>
-void SharedMutex<Executor>::complete(RequestList&& requests,
-                                     boost::system::error_code ec)
-{
-  while (!requests.empty()) {
-    auto& request = requests.front();
-    requests.pop_front();
-    try {
-      request.complete(ec);
-    } catch (...) {
-      // clean up any remaining completions and rethrow
-      requests.clear_and_dispose([] (LockRequest *r) { r->destroy(); });
-      throw;
-    }
-  }
-}
-
-} // namespace ceph::async
-
-#endif // CEPH_ASYNC_SHARED_MUTEX_H
diff --git a/src/test/common/CMakeLists.txt b/src/test/common/CMakeLists.txt
index 6a41340f8a5..d68cfa2e556 100644
--- a/src/test/common/CMakeLists.txt
+++ b/src/test/common/CMakeLists.txt
@@ -294,7 +294,3 @@ add_ceph_unittest(unittest_hobject)
 add_executable(unittest_async_completion test_async_completion.cc)
 add_ceph_unittest(unittest_async_completion)
 target_link_libraries(unittest_async_completion Boost::system)
-
-add_executable(unittest_async_shared_mutex test_async_shared_mutex.cc)
-add_ceph_unittest(unittest_async_shared_mutex)
-target_link_libraries(unittest_async_shared_mutex Boost::system)
diff --git a/src/test/common/test_async_shared_mutex.cc b/src/test/common/test_async_shared_mutex.cc
deleted file mode 100644
index aed6e7b00ee..00000000000
--- a/src/test/common/test_async_shared_mutex.cc
+++ /dev/null
@@ -1,428 +0,0 @@
-// -*- 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) 2018 Red Hat
- *
- * 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.
- *
- */
-
-#include "common/async/shared_mutex.h"
-#include <optional>
-#include <gtest/gtest.h>
-
-namespace ceph::async {
-
-using executor_type = boost::asio::io_context::executor_type;
-using unique_lock = std::unique_lock<SharedMutex<executor_type>>;
-using shared_lock = std::shared_lock<SharedMutex<executor_type>>;
-
-// return a lambda that captures its error code and lock
-auto capture(std::optional<boost::system::error_code>& ec, unique_lock& lock)
-{
-  return [&] (boost::system::error_code e, unique_lock l) {
-    ec = e;
-    lock = std::move(l);
-  };
-}
-auto capture(std::optional<boost::system::error_code>& ec, shared_lock& lock)
-{
-  return [&] (boost::system::error_code e, shared_lock l) {
-    ec = e;
-    lock = std::move(l);
-  };
-}
-
-TEST(SharedMutex, async_exclusive)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::optional<boost::system::error_code> ec1, ec2, ec3;
-  unique_lock lock1, lock2, lock3;
-
-  // request three exclusive locks
-  mutex.async_lock(capture(ec1, lock1));
-  mutex.async_lock(capture(ec2, lock2));
-  mutex.async_lock(capture(ec3, lock3));
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped()); // second lock still pending
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  EXPECT_FALSE(ec2);
-
-  lock1.unlock();
-
-  EXPECT_FALSE(ec2);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped());
-
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::system::errc::success, *ec2);
-  ASSERT_TRUE(lock2);
-  EXPECT_FALSE(ec3);
-
-  lock2.unlock();
-
-  EXPECT_FALSE(ec3);
-
-  context.poll();
-  EXPECT_TRUE(context.stopped());
-
-  ASSERT_TRUE(ec3);
-  EXPECT_EQ(boost::system::errc::success, *ec3);
-  ASSERT_TRUE(lock3);
-}
-
-TEST(SharedMutex, async_shared)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::optional<boost::system::error_code> ec1, ec2;
-  shared_lock lock1, lock2;
-
-  // request two shared locks
-  mutex.async_lock_shared(capture(ec1, lock1));
-  mutex.async_lock_shared(capture(ec2, lock2));
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-
-  context.poll();
-  EXPECT_TRUE(context.stopped());
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::system::errc::success, *ec2);
-  ASSERT_TRUE(lock2);
-}
-
-TEST(SharedMutex, async_exclusive_while_shared)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::optional<boost::system::error_code> ec1, ec2;
-  shared_lock lock1;
-  unique_lock lock2;
-
-  // request a shared and exclusive lock
-  mutex.async_lock_shared(capture(ec1, lock1));
-  mutex.async_lock(capture(ec2, lock2));
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped()); // second lock still pending
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  EXPECT_FALSE(ec2);
-
-  lock1.unlock();
-
-  EXPECT_FALSE(ec2);
-
-  context.poll();
-  EXPECT_TRUE(context.stopped());
-
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::system::errc::success, *ec2);
-  ASSERT_TRUE(lock2);
-}
-
-TEST(SharedMutex, async_shared_while_exclusive)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::optional<boost::system::error_code> ec1, ec2;
-  unique_lock lock1;
-  shared_lock lock2;
-
-  // request an exclusive and shared lock
-  mutex.async_lock(capture(ec1, lock1));
-  mutex.async_lock_shared(capture(ec2, lock2));
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped()); // second lock still pending
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  EXPECT_FALSE(ec2);
-
-  lock1.unlock();
-
-  EXPECT_FALSE(ec2);
-
-  context.poll();
-  EXPECT_TRUE(context.stopped());
-
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::system::errc::success, *ec2);
-  ASSERT_TRUE(lock2);
-}
-
-TEST(SharedMutex, async_prioritize_exclusive)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::optional<boost::system::error_code> ec1, ec2, ec3;
-  shared_lock lock1, lock3;
-  unique_lock lock2;
-
-  // acquire a shared lock, then request an exclusive and another shared lock
-  mutex.async_lock_shared(capture(ec1, lock1));
-  mutex.async_lock(capture(ec2, lock2));
-  mutex.async_lock_shared(capture(ec3, lock3));
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped());
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  EXPECT_FALSE(ec2);
-  // exclusive waiter blocks the second shared lock
-  EXPECT_FALSE(ec3);
-
-  lock1.unlock();
-
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped());
-
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::system::errc::success, *ec2);
-  ASSERT_TRUE(lock2);
-  EXPECT_FALSE(ec3);
-}
-
-TEST(SharedMutex, async_cancel)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::optional<boost::system::error_code> ec1, ec2, ec3, ec4;
-  unique_lock lock1, lock2;
-  shared_lock lock3, lock4;
-
-  // request 2 exclusive and shared locks
-  mutex.async_lock(capture(ec1, lock1));
-  mutex.async_lock(capture(ec2, lock2));
-  mutex.async_lock_shared(capture(ec3, lock3));
-  mutex.async_lock_shared(capture(ec4, lock4));
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-  EXPECT_FALSE(ec4);
-
-  context.poll();
-  EXPECT_FALSE(context.stopped());
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-  EXPECT_FALSE(ec4);
-
-  mutex.cancel();
-
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-  EXPECT_FALSE(ec4);
-
-  context.poll();
-  EXPECT_TRUE(context.stopped());
-
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::asio::error::operation_aborted, *ec2);
-  EXPECT_FALSE(lock2);
-  ASSERT_TRUE(ec3);
-  EXPECT_EQ(boost::asio::error::operation_aborted, *ec3);
-  EXPECT_FALSE(lock3);
-  ASSERT_TRUE(ec4);
-  EXPECT_EQ(boost::asio::error::operation_aborted, *ec4);
-  EXPECT_FALSE(lock4);
-}
-
-TEST(SharedMutex, async_destruct)
-{
-  boost::asio::io_context context;
-
-  std::optional<boost::system::error_code> ec1, ec2, ec3, ec4;
-  unique_lock lock1, lock2;
-  shared_lock lock3, lock4;
-
-  {
-    SharedMutex mutex(context.get_executor());
-
-    // request 2 exclusive and shared locks
-    mutex.async_lock(capture(ec1, lock1));
-    mutex.async_lock(capture(ec2, lock2));
-    mutex.async_lock_shared(capture(ec3, lock3));
-    mutex.async_lock_shared(capture(ec4, lock4));
-  }
-
-  EXPECT_FALSE(ec1); // no callbacks until poll()
-  EXPECT_FALSE(ec2);
-  EXPECT_FALSE(ec3);
-  EXPECT_FALSE(ec4);
-
-  context.poll();
-  EXPECT_TRUE(context.stopped());
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::asio::error::operation_aborted, *ec2);
-  EXPECT_FALSE(lock2);
-  ASSERT_TRUE(ec3);
-  EXPECT_EQ(boost::asio::error::operation_aborted, *ec3);
-  EXPECT_FALSE(lock3);
-  ASSERT_TRUE(ec4);
-  EXPECT_EQ(boost::asio::error::operation_aborted, *ec4);
-  EXPECT_FALSE(lock4);
-}
-
-// return a capture() lambda that's bound to the given executor
-template <typename Executor, typename ...Args>
-auto capture_ex(const Executor& ex, Args&& ...args)
-{
-  return boost::asio::bind_executor(ex, capture(std::forward<Args>(args)...));
-}
-
-TEST(SharedMutex, cross_executor)
-{
-  boost::asio::io_context mutex_context;
-  SharedMutex mutex(mutex_context.get_executor());
-
-  boost::asio::io_context callback_context;
-  auto ex2 = callback_context.get_executor();
-
-  std::optional<boost::system::error_code> ec1, ec2;
-  unique_lock lock1, lock2;
-
-  // request two exclusive locks
-  mutex.async_lock(capture_ex(ex2, ec1, lock1));
-  mutex.async_lock(capture_ex(ex2, ec2, lock2));
-
-  EXPECT_FALSE(ec1);
-  EXPECT_FALSE(ec2);
-
-  mutex_context.poll();
-  EXPECT_FALSE(mutex_context.stopped()); // maintains work on both executors
-
-  EXPECT_FALSE(ec1); // no callbacks until poll() on callback_context
-  EXPECT_FALSE(ec2);
-
-  callback_context.poll();
-  EXPECT_FALSE(callback_context.stopped()); // second lock still pending
-
-  ASSERT_TRUE(ec1);
-  EXPECT_EQ(boost::system::errc::success, *ec1);
-  ASSERT_TRUE(lock1);
-  EXPECT_FALSE(ec2);
-
-  lock1.unlock();
-
-  mutex_context.poll();
-  EXPECT_TRUE(mutex_context.stopped());
-
-  EXPECT_FALSE(ec2);
-
-  callback_context.poll();
-  EXPECT_TRUE(callback_context.stopped());
-
-  ASSERT_TRUE(ec2);
-  EXPECT_EQ(boost::system::errc::success, *ec2);
-  ASSERT_TRUE(lock2);
-}
-
-TEST(SharedMutex, try_exclusive)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-  {
-    std::lock_guard lock{mutex};
-    ASSERT_FALSE(mutex.try_lock()); // fail during exclusive
-  }
-  {
-    std::shared_lock lock{mutex};
-    ASSERT_FALSE(mutex.try_lock()); // fail during shared
-  }
-  ASSERT_TRUE(mutex.try_lock());
-  mutex.unlock();
-}
-
-TEST(SharedMutex, try_shared)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-  {
-    std::lock_guard lock{mutex};
-    ASSERT_FALSE(mutex.try_lock_shared()); // fail during exclusive
-  }
-  {
-    std::shared_lock lock{mutex};
-    ASSERT_TRUE(mutex.try_lock_shared()); // succeed during shared
-    mutex.unlock_shared();
-  }
-  ASSERT_TRUE(mutex.try_lock_shared());
-  mutex.unlock_shared();
-}
-
-TEST(SharedMutex, cancel)
-{
-  boost::asio::io_context context;
-  SharedMutex mutex(context.get_executor());
-
-  std::lock_guard l{mutex}; // exclusive lock blocks others
-
-  // make synchronous lock calls in other threads
-  auto f1 = std::async(std::launch::async, [&] { mutex.lock(); });
-  auto f2 = std::async(std::launch::async, [&] { mutex.lock_shared(); });
-
-  // this will race with spawned threads. just keep canceling until the
-  // futures are ready
-  const auto t = std::chrono::milliseconds(1);
-  do { mutex.cancel(); } while (f1.wait_for(t) != std::future_status::ready);
-  do { mutex.cancel(); } while (f2.wait_for(t) != std::future_status::ready);
-
-  EXPECT_THROW(f1.get(), boost::system::system_error);
-  EXPECT_THROW(f2.get(), boost::system::system_error);
-}
-
-} // namespace ceph::async