2 * Copyright 2017 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 #include <type_traits>
24 #include <folly/Range.h>
28 // This looks a bit weird, but it's necessary to avoid
29 // having an undefined compiler function called.
30 #if defined(__GLIBC__) && !defined(__APPLE__) && !defined(__ANDROID__)
31 #if __GLIBC_PREREQ(2, 12)
32 // has pthread_setname_np(pthread_t, const char*) (2 params)
33 #define FOLLY_HAS_PTHREAD_SETNAME_NP_THREAD_NAME 1
36 #if defined(__APPLE__) && defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
37 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
38 // has pthread_setname_np(const char*) (1 param)
39 #define FOLLY_HAS_PTHREAD_SETNAME_NP_NAME 1
44 inline bool setThreadName(T /* id */, StringPiece /* name */) {
46 std::is_same<T, pthread_t>::value ||
47 std::is_same<T, std::thread::id>::value ||
48 std::is_same<T, std::thread::native_handle_type>::value,
49 "type must be pthread_t, std::thread::id or "
50 "std::thread::native_handle_type");
54 #ifdef FOLLY_HAS_PTHREAD_SETNAME_NP_THREAD_NAME
56 inline bool setThreadName(pthread_t id, StringPiece name) {
57 return 0 == pthread_setname_np(id, name.fbstr().substr(0, 15).c_str());
61 #ifdef FOLLY_HAS_PTHREAD_SETNAME_NP_NAME
63 inline bool setThreadName(pthread_t id, StringPiece name) {
64 // Since OS X 10.6 it is possible for a thread to set its own name,
65 // but not that of some other thread.
66 if (pthread_equal(pthread_self(), id)) {
67 return 0 == pthread_setname_np(name.fbstr().c_str());
74 inline typename std::enable_if<
75 std::is_same<pthread_t, std::thread::native_handle_type>::value,
77 setThreadName(std::thread::id id, StringPiece name) {
79 sizeof(std::thread::native_handle_type) == sizeof(decltype(id)),
80 "This assumes std::thread::id is a thin wrapper around "
81 "std::thread::native_handle_type, but that doesn't appear to be true.");
82 // In most implementations, std::thread::id is a thin wrapper around
83 // std::thread::native_handle_type, which means we can do unsafe things to
85 pthread_t ptid = *reinterpret_cast<pthread_t*>(&id);
86 return setThreadName(ptid, name);
89 inline bool setThreadName(StringPiece name) {
90 return setThreadName(pthread_self(), name);