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95 lines
2.0 KiB
95 lines
2.0 KiB
/*
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Copyright (c) 2022 Sogou, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Authors: Xie Han (xiehan@sogou-inc.com)
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*/
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#include "list.h"
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#include "WFTask.h"
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#include "WFMessageQueue.h"
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class __MQConditional : public WFConditional
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{
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public:
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struct list_head list;
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struct WFMessageQueue::Data *data;
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public:
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virtual void dispatch();
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virtual void signal(void *msg) { }
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public:
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__MQConditional(SubTask *task, void **msgbuf,
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struct WFMessageQueue::Data *data) :
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WFConditional(task, msgbuf)
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{
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this->data = data;
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}
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__MQConditional(SubTask *task,
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struct WFMessageQueue::Data *data) :
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WFConditional(task)
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{
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this->data = data;
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}
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};
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void __MQConditional::dispatch()
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{
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struct WFMessageQueue::Data *data = this->data;
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data->mutex.lock();
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if (!list_empty(&data->msg_list))
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this->WFConditional::signal(data->pop());
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else
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list_add_tail(&this->list, &data->wait_list);
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data->mutex.unlock();
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this->WFConditional::dispatch();
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}
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WFConditional *WFMessageQueue::get(SubTask *task, void **msgbuf)
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{
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return new __MQConditional(task, msgbuf, &this->data);
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}
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WFConditional *WFMessageQueue::get(SubTask *task)
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{
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return new __MQConditional(task, &this->data);
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}
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void WFMessageQueue::post(void *msg)
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{
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struct WFMessageQueue::Data *data = &this->data;
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WFConditional *cond;
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data->mutex.lock();
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if (!list_empty(&data->wait_list))
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{
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cond = list_entry(data->wait_list.next, __MQConditional, list);
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list_del(data->wait_list.next);
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}
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else
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{
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cond = NULL;
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this->push(msg);
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}
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data->mutex.unlock();
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if (cond)
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cond->WFConditional::signal(msg);
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}
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