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/**
* @file threadpool.h
* @author Nat Goodspeed
* @date 2021-10-21
* @brief ThreadPool configures a WorkQueue along with a pool of threads to
* service it.
*
* $LicenseInfo:firstyear=2021&license=viewerlgpl$
* Copyright (c) 2021, Linden Research, Inc.
* $/LicenseInfo$
*/
#if ! defined(LL_THREADPOOL_H)
#define LL_THREADPOOL_H
#include "workqueue.h"
#include <string>
#include <thread>
#include <utility> // std::pair
#include <vector>
namespace LL
{
class ThreadPool: public LLInstanceTracker<ThreadPool, std::string>
{
private:
using super = LLInstanceTracker<ThreadPool, std::string>;
public:
/**
* Pass ThreadPool a string name. This can be used to look up the
* relevant WorkQueue.
*/
ThreadPool(const std::string& name, size_t threads=1, size_t capacity=1024, bool auto_shutdown = true);
virtual ~ThreadPool();
/**
* Launch the ThreadPool. Until this call, a constructed ThreadPool
* launches no threads. That permits coders to derive from ThreadPool,
* or store it as a member of some other class, but refrain from
* launching it until all other construction is complete.
*/
void start();
/**
* ThreadPool listens for application shutdown messages on the "LLApp"
* LLEventPump. Call close() to shut down this ThreadPool early.
*/
void close();
std::string getName() const { return mName; }
size_t getWidth() const { return mThreads.size(); }
/// obtain a non-const reference to the WorkQueue to post work to it
WorkQueue& getQueue() { return mQueue; }
/**
* Override run() if you need special processing. The default run()
* implementation simply calls WorkQueue::runUntilClose().
*/
virtual void run();
private:
void run(const std::string& name);
WorkQueue mQueue;
std::string mName;
size_t mThreadCount;
std::vector<std::pair<std::string, std::thread>> mThreads;
bool mAutomaticShutdown;
};
} // namespace LL
#endif /* ! defined(LL_THREADPOOL_H) */
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