84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// bthread - A M:N threading library to make applications more concurrent.
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// Date: Sun, 22 Jan 2017
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#ifndef BTHREAD_REMOTE_TASK_QUEUE_H
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#define BTHREAD_REMOTE_TASK_QUEUE_H
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#include "butil/containers/bounded_queue.h"
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#include "butil/macros.h"
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namespace bthread {
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class TaskGroup;
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// A queue for storing bthreads created by non-workers. Since non-workers
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// randomly choose a TaskGroup to push which distributes the contentions,
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// this queue is simply implemented as a queue protected with a lock.
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// The function names should be self-explanatory.
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class RemoteTaskQueue {
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public:
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RemoteTaskQueue() {}
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int init(size_t cap) {
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const size_t memsize = sizeof(bthread_t) * cap;
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void* q_mem = malloc(memsize);
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if (q_mem == NULL) {
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return -1;
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}
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butil::BoundedQueue<bthread_t> q(q_mem, memsize, butil::OWNS_STORAGE);
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_tasks.swap(q);
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return 0;
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}
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bool pop(bthread_t* task) {
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if (_tasks.empty()) {
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return false;
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}
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_mutex.lock();
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const bool result = _tasks.pop(task);
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_mutex.unlock();
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return result;
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}
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bool push(bthread_t task) {
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_mutex.lock();
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const bool res = push_locked(task);
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_mutex.unlock();
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return res;
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}
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bool push_locked(bthread_t task) {
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return _tasks.push(task);
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}
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size_t capacity() const { return _tasks.capacity(); }
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private:
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friend class TaskGroup;
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DISALLOW_COPY_AND_ASSIGN(RemoteTaskQueue);
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butil::BoundedQueue<bthread_t> _tasks;
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butil::Mutex _mutex;
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};
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} // namespace bthread
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#endif // BTHREAD_REMOTE_TASK_QUEUE_H
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