message: refactor: replace Boost shared_mutex with std shared_mutex in cuckoocache tests
diff: // Copyright (c) 2012-2020 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  -#include <boost/test/unit_test.hpp>
  -#include <boost/thread/lock_types.hpp>
  -#include <boost/thread/shared_mutex.hpp>
  #include <cuckoocache.h>
  -#include <deque>
  #include <random.h>
  #include <script/sigcache.h>
  #include <test/util/setup_common.h>
  +
  +#include <boost/test/unit_test.hpp>
  +
  +#include <deque>
  +#include <mutex>
  +#include <shared_mutex>
  #include <thread>
  +#include <vector>
  /** Test Suite for CuckooCache
  *
  @@ -201,11 +204,11 @@ static void test_cache_erase_parallel(size_t megabytes)
  * "future proofed".
  */
  std::vector<uint256> hashes_insert_copy = hashes;
  - boost::shared_mutex mtx;
  + std::shared_mutex mtx;
  {
  /** Grab lock to make sure we release inserts */
  - boost::unique_lock<boost::shared_mutex> l(mtx);
  + std::unique_lock<std::shared_mutex> l(mtx);
  /** Insert the first half */
  for (uint32_t i = 0; i < (n_insert / 2); ++i)
  set.insert(hashes_insert_copy[i]);
  @@ -219,7 +222,7 @@ static void test_cache_erase_parallel(size_t megabytes)
  /** Each thread is emplaced with x copy-by-value
  */
  threads.emplace_back([&, x] {
  - boost::shared_lock<boost::shared_mutex> l(mtx);
  + std::shared_lock<std::shared_mutex> l(mtx);
  size_t ntodo = (n_insert/4)/3;
  size_t start = ntodo*x;
  size_t end = ntodo*(x+1);
  @@ -234,7 +237,7 @@ static void test_cache_erase_parallel(size_t megabytes)
  for (std::thread& t : threads)
  t.join();
  /** Grab lock to make sure we observe erases */
  - boost::unique_lock<boost::shared_mutex> l(mtx);
  + std::unique_lock<std::shared_mutex> l(mtx);
  /** Insert the second half */
  for (uint32_t i = (n_insert / 2); i < n_insert; ++i)
  set.insert(hashes_insert_copy[i]);
  