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// bthread - A M:N threading library to make applications more concurrent.
// Copyright (c) 2017 Baidu, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// 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.
// Author: Ge,Jun (gejun@baidu.com)
// Date: Sun, 22 Jan 2017
#ifndef BAIDU_BTHREAD_REMOTE_TASK_QUEUE_H
#define BAIDU_BTHREAD_REMOTE_TASK_QUEUE_H
#include "base/containers/bounded_queue.h"
#include "base/macros.h"
namespace bthread {
class TaskGroup;
// A queue for storing bthreads created by non-workers. Since non-workers
// randomly choose a TaskGroup to push which distributes the contentions,
// this queue is simply implemented as a queue protected with a lock.
// The function names should be self-explanatory.
class RemoteTaskQueue {
public:
RemoteTaskQueue() {}
int init(size_t cap) {
const size_t memsize = sizeof(bthread_t) * cap;
void* q_mem = malloc(memsize);
if (q_mem == NULL) {
return -1;
}
base::BoundedQueue<bthread_t> q(q_mem, memsize, base::OWNS_STORAGE);
_tasks.swap(q);
return 0;
}
bool pop(bthread_t* task) {
if (_tasks.empty()) {
return false;
}
_mutex.lock();
const bool result = _tasks.pop(task);
_mutex.unlock();
return result;
}
bool push(bthread_t task) {
_mutex.lock();
const bool res = push_locked(task);
_mutex.unlock();
return res;
}
bool push_locked(bthread_t task) {
return _tasks.push(task);
}
size_t capacity() const { return _tasks.capacity(); }
private:
friend class TaskGroup;
DISALLOW_COPY_AND_ASSIGN(RemoteTaskQueue);
base::BoundedQueue<bthread_t> _tasks;
base::Mutex _mutex;
};
} // namespace bthread
#endif // BAIDU_BTHREAD_REMOTE_TASK_QUEUE_H