libs/capy/src/detail/thread_name.cpp
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2026 Michael Vandeberg | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/capy | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/capy/detail/thread_name.hpp> | ||
| 11 | |||
| 12 | #if defined(_WIN32) | ||
| 13 | |||
| 14 | #ifndef NOMINMAX | ||
| 15 | #define NOMINMAX | ||
| 16 | #endif | ||
| 17 | #include <windows.h> | ||
| 18 | #include <string> | ||
| 19 | |||
| 20 | #elif defined(__APPLE__) | ||
| 21 | |||
| 22 | #include <pthread.h> | ||
| 23 | #include <cstring> | ||
| 24 | |||
| 25 | #elif defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) | ||
| 26 | |||
| 27 | #include <pthread.h> | ||
| 28 | #include <cstring> | ||
| 29 | |||
| 30 | #endif | ||
| 31 | |||
| 32 | /* | ||
| 33 | Platform-specific thread naming implementation. | ||
| 34 | |||
| 35 | Each platform has a different API and name length limit: | ||
| 36 | - Windows: SetThreadDescription with UTF-8 to UTF-16 conversion (no limit) | ||
| 37 | - macOS: pthread_setname_np(name) with 63-char limit | ||
| 38 | - Linux/BSD: pthread_setname_np(thread, name) with 15-char limit | ||
| 39 | |||
| 40 | All operations are best-effort and silently fail on error, since thread | ||
| 41 | naming is purely for debugging visibility and should never affect program | ||
| 42 | correctness. The noexcept guarantee is maintained by catching exceptions | ||
| 43 | from std::wstring allocation on Windows. | ||
| 44 | */ | ||
| 45 | |||
| 46 | namespace boost { | ||
| 47 | namespace capy { | ||
| 48 | namespace detail { | ||
| 49 | |||
| 50 | void | ||
| 51 | 39 | set_current_thread_name(char const* name) noexcept | |
| 52 | { | ||
| 53 | #if defined(_WIN32) | ||
| 54 | // SetThreadDescription requires Windows 10 1607+. Older Windows versions | ||
| 55 | // are unsupported; the program may fail to link on those systems. | ||
| 56 | |||
| 57 | // Query required buffer size for UTF-8 to wide conversion. | ||
| 58 | int required = MultiByteToWideChar(CP_UTF8, 0, name, -1, nullptr, 0); | ||
| 59 | if(required <= 0) | ||
| 60 | return; | ||
| 61 | |||
| 62 | // Allocate and convert; catch exceptions to maintain noexcept. | ||
| 63 | std::wstring wname; | ||
| 64 | try | ||
| 65 | { | ||
| 66 | wname.resize(static_cast<std::size_t>(required)); | ||
| 67 | } | ||
| 68 | catch(...) | ||
| 69 | { | ||
| 70 | return; | ||
| 71 | } | ||
| 72 | |||
| 73 | if(MultiByteToWideChar(CP_UTF8, 0, name, -1, wname.data(), required) <= 0) | ||
| 74 | return; | ||
| 75 | |||
| 76 | // Ignore return value: thread naming is best-effort for debugging. | ||
| 77 | (void)SetThreadDescription(GetCurrentThread(), wname.c_str()); | ||
| 78 | #elif defined(__APPLE__) | ||
| 79 | // macOS pthread_setname_np takes only the name (no thread handle) | ||
| 80 | // and has a 64 char limit (63 + null terminator) | ||
| 81 | char truncated[64]; | ||
| 82 | std::strncpy(truncated, name, 63); | ||
| 83 | truncated[63] = '\0'; | ||
| 84 | |||
| 85 | // Ignore return value: thread naming is best-effort for debugging. | ||
| 86 | (void)pthread_setname_np(truncated); | ||
| 87 | #elif defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) | ||
| 88 | // pthread_setname_np has 16 char limit (15 + null terminator) | ||
| 89 | char truncated[16]; | ||
| 90 | 39 | std::strncpy(truncated, name, 15); | |
| 91 | 39 | truncated[15] = '\0'; | |
| 92 | |||
| 93 | // Ignore return value: thread naming is best-effort for debugging. | ||
| 94 | 39 | (void)pthread_setname_np(pthread_self(), truncated); | |
| 95 | #else | ||
| 96 | (void)name; | ||
| 97 | #endif | ||
| 98 | 39 | } | |
| 99 | |||
| 100 | } // detail | ||
| 101 | } // capy | ||
| 102 | } // boost | ||
| 103 |