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Copy paththread_pool.cpp
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153 lines (118 loc) · 3.7 KB
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/*
* Tencent is pleased to support the open source community by making Pebble available.
* Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*
*/
#include <iostream>
#include "common/thread_pool.h"
namespace pebble {
ThreadPool::ThreadPool() : m_exit(false), m_initialized(false),
m_thread_num(0), m_mode(PENDING) {
}
ThreadPool::~ThreadPool() {
Terminate();
}
int ThreadPool::Init(int32_t thread_num, int32_t mode) {
if (m_initialized) {
return -1;
}
if (thread_num <= 0) {
return -2;
}
if (thread_num > 256) {
thread_num = 256;
}
m_thread_num = thread_num;
if (mode >= NO_PENDING || mode < PENDING) {
m_mode = mode;
}
for (int32_t i = 0; i < thread_num; i++) {
InnerThread* thread = new InnerThread(&m_pending_queue, &m_finished_queue, &m_working_queue);
m_threads.push_back(thread);
thread->Start();
}
m_initialized = true;
return 0;
}
int ThreadPool::AddTask(cxx::function<void()>& fun, int64_t task_id) {
if (!m_initialized) {
return -1;
}
if (m_mode == NO_PENDING) {
Stats stat;
GetStatus(&stat);
if (stat.working_thread_num + stat.pending_task_num >= m_thread_num) {
return -2;
}
}
Task t;
t.fun = fun;
t.task_id = task_id;
m_pending_queue.PushBack(t);
return 0;
}
void ThreadPool::GetStatus(Stats* stat) {
if (stat == NULL) {
return;
}
stat->pending_task_num = m_pending_queue.Size();
stat->working_thread_num = m_working_queue.Size();
}
void ThreadPool::Terminate(bool waiting /* = true */) {
m_exit = true;
for (size_t i = 0; i < m_threads.size(); i++) {
m_threads[i]->Terminate(waiting);
}
for (size_t i = 0; i < m_threads.size(); i++) {
m_threads[i]->Join();
delete m_threads[i];
}
m_pending_queue.Clear();
m_finished_queue.Clear();
m_threads.clear();
}
bool ThreadPool::GetFinishedTaskID(int64_t* task_id) {
if (m_finished_queue.IsEmpty()) {
return false;
}
bool ret = m_finished_queue.TimedPopFront(task_id, 1);
return ret;
}
ThreadPool::InnerThread::InnerThread(BlockingQueue<Task>* pending_queue,
BlockingQueue<int64_t>* finished_queue, BlockingQueue<int64_t>* working_queue) :
m_pending_queue(pending_queue),
m_finished_queue(finished_queue),
m_working_queue(working_queue),
m_exit(false),
m_waiting(true) {
}
void ThreadPool::InnerThread::Run() {
while (1) {
if (m_exit && ((!m_waiting) || (m_waiting && m_pending_queue->IsEmpty()))) {
break;
}
Task t;
bool ret = m_pending_queue->TimedPopFront(&t, 1000);
if (ret) {
m_working_queue->PushBack(0); // 不关心元素的值，只是通过队列size记录忙的线程数
t.fun();
if (t.task_id >= 0) {
m_finished_queue->PushBack(t.task_id);
}
int64_t tmp;
m_working_queue->TryPopBack(&tmp);
}
}
}
void ThreadPool::InnerThread::Terminate(bool waiting /* = true */) {
m_exit = true;
m_waiting = waiting;
}
} // namespace pebble