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/*
* Copyright (c) 2008-2017, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA CORPORATION and its licensors retain all intellectual property
* and proprietary rights in and to this software, related documentation
* and any modifications thereto. Any use, reproduction, disclosure or
* distribution of this software and related documentation without an express
* license agreement from NVIDIA CORPORATION is strictly prohibited.
*/
#pragma once
#include <foundation/PxErrorCallback.h>
#include <regex>
#include "CallbackImplementations.h"
#include <mutex>
#include <thread>
#include <condition_variable>
#include <foundation/PxVec4.h>
#include <foundation/PxVec3.h>
#include <vector>
#include <queue>
#include <atomic>
#include <task/PxTaskManager.h>
#include <task/PxTask.h>
namespace nv
{
namespace cloth
{
class Solver;
}
}
///Dummy task that can be used as end node in a task graph.
class DummyTask : public physx::PxTask
{
public:
DummyTask() { mFinished = false; mTm = nullptr; }
DummyTask(physx::PxTaskManager* tm) { mFinished = false; mTm = tm; mTm->submitUnnamedTask(*this); }
~DummyTask() { mTm = nullptr; } //Way to catch race conditions. Will usually crash on nullptr if the task gets deleted before the taskmanager is done with it.
virtual void run() override { }
virtual void release() override { physx::PxTask::release(); mFinished = true; mWaitEvent.notify_all(); }
virtual const char* getName() const override { return "DummyTask"; }
void Reset(physx::PxTaskManager* tm) { mFinished = false; mTm = tm; mTm->submitUnnamedTask(*this); }
///Use Wait to block the calling thread until this task is finished and save to delete
void Wait()
{
std::mutex eventLock;
std::unique_lock<std::mutex> lock(eventLock);
while (!mFinished) { mWaitEvent.wait(lock); }
}
private:
std::condition_variable mWaitEvent;
bool mFinished;
};
class CpuDispatcher : public physx::PxCpuDispatcher
{
virtual void submitTask(physx::PxBaseTask& task)
{
task.run();
task.release();
}
virtual uint32_t getWorkerCount() const { return 1; }
};
class JobManager;
class Job
{
public:
Job() = default;
Job(const Job&);
void Initialize(JobManager* parent, std::function<void(Job*)> function = std::function<void(Job*)>(), int refcount = 1);
void Reset(int refcount = 1); //Call this before reusing a job that doesn't need to be reinitialized
void Execute();
void AddReference();
void RemoveReference();
void Wait(); //Block until job is finished
private:
virtual void ExecuteInternal() {}
std::function<void(Job*)> mFunction;
JobManager* mParent;
std::atomic_int mRefCount;
bool mFinished;
std::mutex mFinishedLock;
std::condition_variable mFinishedEvent;
};
class JobManager
{
public:
JobManager()
{
mWorkerCount = 8;
mWorkerThreads = new std::thread[mWorkerCount];
mQuit = false;
for(int i = 0; i < mWorkerCount; i++)
mWorkerThreads[i] = std::thread(JobManager::WorkerEntryPoint, this);
}
~JobManager()
{
if(!mQuit)
Quit();
}
void Quit()
{
std::unique_lock<std::mutex> lock(mJobQueueLock);
mQuit = true;
lock.unlock();
mJobQueueEvent.notify_all();
for(int i = 0; i < mWorkerCount; i++)
{
mWorkerThreads[i].join();
}
delete[] mWorkerThreads;
}
template <int count, typename F>
void ParallelLoop(F const& function)
{
/*for(int i = 0; i < count; i++)
function(i);*/
Job finalJob;
finalJob.Initialize(this, std::function<void(Job*)>(), count);
Job jobs[count];
for(int j = 0; j < count; j++)
{
jobs[j].Initialize(this, [j, &finalJob, function](Job*) {function(j); finalJob.RemoveReference(); });
jobs[j].RemoveReference();
}
finalJob.Wait();
}
static void WorkerEntryPoint(JobManager* parrent);
private:
friend class Job;
void Submit(Job* job);
int mWorkerCount;
std::thread* mWorkerThreads;
std::mutex mJobQueueLock;
std::queue<Job*> mJobQueue;
std::condition_variable mJobQueueEvent;
bool mQuit;
};
class MultithreadedSolverHelper
{
public:
void Initialize(nv::cloth::Solver* solver, JobManager* jobManager);
void StartSimulation(float dt);
void WaitForSimulation();
private:
Job mStartSimulationJob;
Job mEndSimulationJob;
std::vector<Job> mSimulationChunkJobs;
float mDt;
nv::cloth::Solver* mSolver;
JobManager* mJobManager;
};
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