1 /*
2 * Copyright 2009-2017 Alibaba Cloud All rights reserved.
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 "ThreadExecutor.h"
18 #include <assert.h>
19 #include "../utils/LogUtils.h"
20
21 using namespace AlibabaCloud::OSS;
22
23 static const char *TAG = "ThreadExecutor";
24
ThreadExecutor()25 ThreadExecutor::ThreadExecutor():
26 state_(State::Free)
27 {
28 }
29
~ThreadExecutor()30 ThreadExecutor::~ThreadExecutor()
31 {
32 auto expected = State::Free;
33 while (!state_.compare_exchange_strong(expected, State::Shutdown))
34 {
35 assert(expected == State::Locked);
36 expected = State::Free;
37 }
38
39 auto it = threads_.begin();
40 while (!threads_.empty())
41 {
42 it->second.join();
43 it = threads_.erase(it);
44 }
45 }
46
execute(Runnable * task)47 void ThreadExecutor::execute(Runnable* task)
48 {
49 auto main = [task, this] {
50 OSS_LOG(LogLevel::LogDebug, TAG, "task(%p) enter execute main thread", task);
51 task->run();
52 delete task;
53 detach(std::this_thread::get_id());
54 OSS_LOG(LogLevel::LogDebug, TAG, "task(%p) leave execute main thread", task);
55 };
56
57 State expected;
58 do
59 {
60 expected = State::Free;
61 if (state_.compare_exchange_strong(expected, State::Locked))
62 {
63 std::thread t(main);
64 const auto id = t.get_id();
65 threads_.emplace(id, std::move(t));
66 state_ = State::Free;
67 return;
68 }
69 } while (expected != State::Shutdown);
70 return;
71 }
72
detach(std::thread::id id)73 void ThreadExecutor::detach(std::thread::id id)
74 {
75 State expected;
76 do
77 {
78 expected = State::Free;
79 if (state_.compare_exchange_strong(expected, State::Locked))
80 {
81 auto it = threads_.find(id);
82 assert(it != threads_.end());
83 it->second.detach();
84 threads_.erase(it);
85 state_ = State::Free;
86 return;
87 }
88 } while (expected != State::Shutdown);
89 }