forked from amazingfate/loongoffice
c123c528bf
Change-Id: Iabe292e68cb84b97f207061347ed6a30309dc9fd Reviewed-on: https://gerrit.libreoffice.org/30679 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
|
|
#ifndef INCLUDED_COMPHELPER_THREADPOOL_HXX
|
|
#define INCLUDED_COMPHELPER_THREADPOOL_HXX
|
|
|
|
#include <sal/config.h>
|
|
#include <salhelper/thread.hxx>
|
|
#include <osl/mutex.hxx>
|
|
#include <osl/conditn.hxx>
|
|
#include <rtl/ref.hxx>
|
|
#include <comphelper/comphelperdllapi.h>
|
|
#include <vector>
|
|
#include <memory>
|
|
|
|
namespace comphelper
|
|
{
|
|
class ThreadTaskTag;
|
|
class ThreadPool;
|
|
|
|
class COMPHELPER_DLLPUBLIC ThreadTask
|
|
{
|
|
friend class ThreadPool;
|
|
std::shared_ptr<ThreadTaskTag> mpTag;
|
|
public:
|
|
ThreadTask(const std::shared_ptr<ThreadTaskTag>& pTag);
|
|
virtual ~ThreadTask() {}
|
|
virtual void doWork() = 0;
|
|
const std::shared_ptr<ThreadTaskTag>& getTag() { return mpTag; }
|
|
};
|
|
|
|
/// A very basic thread pool implementation
|
|
class COMPHELPER_DLLPUBLIC ThreadPool final
|
|
{
|
|
public:
|
|
/// returns a pointer to a shared pool with optimal thread
|
|
/// count for the CPU
|
|
static ThreadPool& getSharedOptimalPool();
|
|
|
|
static std::shared_ptr<ThreadTaskTag> createThreadTaskTag();
|
|
|
|
static bool isTaskTagDone(const std::shared_ptr<ThreadTaskTag>&);
|
|
|
|
/// returns a configurable max-concurrency
|
|
/// limit to avoid spawning an unnecessarily
|
|
/// large number of threads on high-core boxes.
|
|
/// MAX_CONCURRENCY envar controls the cap.
|
|
static sal_Int32 getPreferredConcurrency();
|
|
|
|
ThreadPool( sal_Int32 nWorkers );
|
|
~ThreadPool();
|
|
|
|
/// push a new task onto the work queue
|
|
void pushTask( ThreadTask *pTask /* takes ownership */ );
|
|
|
|
/// wait until all queued tasks associated with the tag are completed
|
|
void waitUntilDone(const std::shared_ptr<ThreadTaskTag>&);
|
|
|
|
/// return the number of live worker threads
|
|
sal_Int32 getWorkerCount() const { return maWorkers.size(); }
|
|
|
|
private:
|
|
ThreadPool(const ThreadPool&) = delete;
|
|
ThreadPool& operator=(const ThreadPool&) = delete;
|
|
|
|
class ThreadWorker;
|
|
friend class ThreadWorker;
|
|
|
|
/// wait until all work is completed, then join all threads
|
|
void waitAndCleanupWorkers();
|
|
|
|
ThreadTask *popWork();
|
|
void startWork();
|
|
void stopWork();
|
|
|
|
osl::Mutex maGuard;
|
|
sal_Int32 mnThreadsWorking;
|
|
/// signalled when all in-progress tasks are complete
|
|
osl::Condition maTasksComplete;
|
|
bool mbTerminate;
|
|
std::vector< rtl::Reference< ThreadWorker > > maWorkers;
|
|
std::vector< ThreadTask * > maTasks;
|
|
};
|
|
|
|
} // namespace comphelper
|
|
|
|
#endif // INCLUDED_COMPHELPER_THREADPOOL_HXX
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|