mirror of
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100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2023 tildearrow and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _WORKPOOL_H
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#define _WORKPOOL_H
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#include <thread>
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#include <atomic>
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#include <functional>
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#include <future>
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#include "../fixedQueue.h"
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class DivWorkPool;
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struct DivPendingTask {
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void (*func)(void*);
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void* funcArg;
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DivPendingTask(void (*f)(void*), void* arg):
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func(f),
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funcArg(arg) {}
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DivPendingTask():
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func(NULL),
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funcArg(NULL) {}
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};
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struct DivWorkThread {
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DivWorkPool* parent;
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std::mutex lock;
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std::thread* thread;
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std::promise<void> notify;
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FixedQueue<DivPendingTask,32> tasks;
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std::atomic<bool> isBusy;
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bool terminate;
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bool promiseAlreadySet;
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void run();
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bool assign(void (*what)(void*), void* arg);
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void wait();
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bool busy();
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void finish();
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bool init(DivWorkPool* p);
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DivWorkThread():
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parent(NULL),
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isBusy(false),
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terminate(false),
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promiseAlreadySet(false) {}
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};
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/**
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* this class provides an implementation of a "thread pool" for executing tasks in parallel.
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* it is highly recommended to use `new` when allocating a DivWorkPool.
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*/
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class DivWorkPool {
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bool threaded;
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unsigned int count;
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unsigned int pos;
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DivWorkThread* workThreads;
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public:
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std::promise<void> notify;
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std::atomic<int> busyCount;
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/**
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* push a new job to this work pool.
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* if all work threads are busy, this will block until one is free.
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*/
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void push(void (*what)(void*), void* arg);
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/**
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* check whether this work pool is busy.
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*/
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bool busy();
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/**
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* wait for all work threads to finish.
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*/
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void wait();
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DivWorkPool(unsigned int threads=0);
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~DivWorkPool();
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};
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#endif
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