1  // Copyright (c) 2018-2021 The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <util/string.h>
 6  #include <util/threadnames.h>
 7  
 8  #include <mutex>
 9  #include <set>
10  #include <string>
11  #include <thread>
12  #include <vector>
13  
14  #if defined(HAVE_CONFIG_H)
15  #include <config/bitcoin-config.h>
16  #endif
17  
18  #include <boost/test/unit_test.hpp>
19  
20  BOOST_AUTO_TEST_SUITE(util_threadnames_tests)
21  
22  const std::string TEST_THREAD_NAME_BASE = "test_thread.";
23  
24  /**
25   * Run a bunch of threads to all call util::ThreadRename.
26   *
27   * @return the set of name each thread has after attempted renaming.
28   */
29  std::set<std::string> RenameEnMasse(int num_threads)
30  {
31      std::vector<std::thread> threads;
32      std::set<std::string> names;
33      std::mutex lock;
34  
35      auto RenameThisThread = [&](int i) {
36          util::ThreadRename(TEST_THREAD_NAME_BASE + ToString(i));
37          std::lock_guard<std::mutex> guard(lock);
38          names.insert(util::ThreadGetInternalName());
39      };
40  
41      threads.reserve(num_threads);
42      for (int i = 0; i < num_threads; ++i) {
43          threads.emplace_back(RenameThisThread, i);
44      }
45  
46      for (std::thread& thread : threads) thread.join();
47  
48      return names;
49  }
50  
51  /**
52   * Rename a bunch of threads with the same basename (expect_multiple=true), ensuring suffixes are
53   * applied properly.
54   */
55  BOOST_AUTO_TEST_CASE(util_threadnames_test_rename_threaded)
56  {
57  #if !defined(HAVE_THREAD_LOCAL)
58      // This test doesn't apply to platforms where we don't have thread_local.
59      return;
60  #endif
61  
62      std::set<std::string> names = RenameEnMasse(100);
63  
64      BOOST_CHECK_EQUAL(names.size(), 100U);
65  
66      // Names "test_thread.[n]" should exist for n = [0, 99]
67      for (int i = 0; i < 100; ++i) {
68          BOOST_CHECK(names.find(TEST_THREAD_NAME_BASE + ToString(i)) != names.end());
69      }
70  
71  }
72  
73  BOOST_AUTO_TEST_SUITE_END()