1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17 #ifndef NETDUTILS_THREADUTIL_H
18 #define NETDUTILS_THREADUTIL_H
19
20 #include <pthread.h>
21 #include <memory>
22
23 #include <android-base/logging.h>
24
25 namespace android {
26 namespace netdutils {
27
28 struct scoped_pthread_attr {
scoped_pthread_attrscoped_pthread_attr29 scoped_pthread_attr() { pthread_attr_init(&attr); }
~scoped_pthread_attrscoped_pthread_attr30 ~scoped_pthread_attr() { pthread_attr_destroy(&attr); }
31
detachscoped_pthread_attr32 int detach() { return -pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); }
33
34 pthread_attr_t attr;
35 };
36
setThreadName(std::string name)37 inline void setThreadName(std::string name) {
38 // MAX_TASK_COMM_LEN=16 is not exported by bionic.
39 const size_t MAX_TASK_COMM_LEN = 16;
40
41 // Crop name to 16 bytes including the NUL byte, as required by pthread_setname_np()
42 if (name.size() >= MAX_TASK_COMM_LEN) name.resize(MAX_TASK_COMM_LEN - 1);
43
44 if (int ret = pthread_setname_np(pthread_self(), name.c_str()); ret != 0) {
45 LOG(WARNING) << "Unable to set thread name to " << name << ": " << strerror(ret);
46 }
47 }
48
49 template <typename T>
runAndDelete(void * obj)50 inline void* runAndDelete(void* obj) {
51 std::unique_ptr<T> handler(reinterpret_cast<T*>(obj));
52 setThreadName(handler->threadName().c_str());
53 handler->run();
54 return nullptr;
55 }
56
57 template <typename T>
threadLaunch(T * obj)58 inline int threadLaunch(T* obj) {
59 if (obj == nullptr) {
60 return -EINVAL;
61 }
62
63 scoped_pthread_attr scoped_attr;
64
65 int rval = scoped_attr.detach();
66 if (rval != 0) {
67 return rval;
68 }
69
70 pthread_t thread;
71 rval = pthread_create(&thread, &scoped_attr.attr, &runAndDelete<T>, obj);
72 if (rval != 0) {
73 LOG(WARNING) << __func__ << ": pthread_create failed: " << rval;
74 return -rval;
75 }
76
77 return rval;
78 }
79
80 } // namespace netdutils
81 } // namespace android
82
83 #endif // NETDUTILS_THREADUTIL_H
84