1  // Copyright (c) 2018-present 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 <cstring>
 6  #include <string>
 7  #include <thread>
 8  #include <utility>
 9  
10  #if (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__))
11  #include <pthread.h>
12  #include <pthread_np.h>
13  #endif
14  
15  #include <util/threadnames.h>
16  
17  #if __has_include(<sys/prctl.h>)
18  #include <sys/prctl.h>
19  #endif
20  
21  //! Set the thread's name at the process level. Does not affect the
22  //! internal name.
23  static void SetThreadName(const char* name)
24  {
25  #if defined(PR_SET_NAME)
26      // Only the first 15 characters are used (16 - NUL terminator)
27      ::prctl(PR_SET_NAME, name, 0, 0, 0);
28  #elif (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__))
29      pthread_set_name_np(pthread_self(), name);
30  #elif defined(__APPLE__)
31      pthread_setname_np(name);
32  #else
33      // Prevent warnings for unused parameters...
34      (void)name;
35  #endif
36  }
37  
38  /**
39   * The name of the thread. We use char array instead of std::string to avoid
40   * complications with running a destructor when the thread exits. Avoid adding
41   * other thread_local variables.
42   * @see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278701
43   */
44  static thread_local char g_thread_name[128]{'\0'};
45  std::string util::ThreadGetInternalName() { return g_thread_name; }
46  //! Set the in-memory internal name for this thread. Does not affect the process
47  //! name.
48  static void SetInternalName(const std::string& name)
49  {
50      const size_t copy_bytes{std::min(sizeof(g_thread_name) - 1, name.length())};
51      std::memcpy(g_thread_name, name.data(), copy_bytes);
52      g_thread_name[copy_bytes] = '\0';
53  }
54  
55  void util::ThreadRename(const std::string& name)
56  {
57      SetThreadName(("b-" + name).c_str());
58      SetInternalName(name);
59  }
60  
61  void util::ThreadSetInternalName(const std::string& name)
62  {
63      SetInternalName(name);
64  }