1 /*
2 * Copyright 2019 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 #include "os/thread.h"
18
19 #include <bluetooth/log.h>
20 #include <fcntl.h>
21 #include <sys/syscall.h>
22 #include <unistd.h>
23
24 #include <cerrno>
25 #include <cstring>
26
27 #include "os/log.h"
28
29 namespace bluetooth {
30 namespace os {
31
32 namespace {
33 constexpr int kRealTimeFifoSchedulingPriority = 1;
34 }
35
Thread(const std::string & name,const Priority priority)36 Thread::Thread(const std::string& name, const Priority priority)
37 : name_(name), reactor_(), running_thread_(&Thread::run, this, priority) {}
38
run(Priority priority)39 void Thread::run(Priority priority) {
40 if (priority == Priority::REAL_TIME) {
41 struct sched_param rt_params = {.sched_priority = kRealTimeFifoSchedulingPriority};
42 auto linux_tid = static_cast<pid_t>(syscall(SYS_gettid));
43 int rc;
44 RUN_NO_INTR(rc = sched_setscheduler(linux_tid, SCHED_FIFO, &rt_params));
45 if (rc != 0) {
46 log::error("unable to set SCHED_FIFO priority: {}", strerror(errno));
47 }
48 }
49 reactor_.Run();
50 }
51
~Thread()52 Thread::~Thread() {
53 Stop();
54 }
55
Stop()56 bool Thread::Stop() {
57 std::lock_guard<std::mutex> lock(mutex_);
58 log::assert_that(
59 std::this_thread::get_id() != running_thread_.get_id(),
60 "assert failed: std::this_thread::get_id() != running_thread_.get_id()");
61
62 if (!running_thread_.joinable()) {
63 return false;
64 }
65 reactor_.Stop();
66 running_thread_.join();
67 return true;
68 }
69
IsSameThread() const70 bool Thread::IsSameThread() const {
71 return std::this_thread::get_id() == running_thread_.get_id();
72 }
73
GetReactor() const74 Reactor* Thread::GetReactor() const {
75 return &reactor_;
76 }
77
GetThreadName() const78 std::string Thread::GetThreadName() const {
79 return name_;
80 }
81
ToString() const82 std::string Thread::ToString() const {
83 return "Thread " + name_;
84 }
85
86 } // namespace os
87 } // namespace bluetooth
88