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