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#include "base/thread_pool.hpp"
#include "base/thread.hpp"
#include "base/threaded_list.hpp"
#include <functional>
#include <memory>
#include <utility>
#include <vector>
namespace base
{
namespace thread_pool
{
namespace routine
{
using namespace threads;
namespace
{
typedef std::function<threads::IRoutine *()> TPopRoutineFn;
class PoolRoutine : public IRoutine
{
public:
PoolRoutine(const TPopRoutineFn & popFn, const TFinishRoutineFn & finishFn)
: m_popFn(popFn)
, m_finishFn(finishFn)
{
}
virtual void Do()
{
while (!IsCancelled())
{
threads::IRoutine * task = m_popFn();
if (task == NULL)
{
Cancel();
continue;
}
if (!task->IsCancelled())
task->Do();
m_finishFn(task);
}
}
private:
TPopRoutineFn m_popFn;
TFinishRoutineFn m_finishFn;
};
}
class ThreadPool::Impl
{
public:
Impl(size_t size, const TFinishRoutineFn & finishFn) : m_finishFn(finishFn), m_threads(size)
{
for (auto & thread : m_threads)
{
thread.reset(new threads::Thread());
thread->Create(std::make_unique<PoolRoutine>(std::bind(&ThreadPool::Impl::PopFront, this), m_finishFn));
}
}
~Impl()
{
Stop();
}
void PushBack(threads::IRoutine * routine)
{
m_tasks.PushBack(routine);
}
void PushFront(threads::IRoutine * routine)
{
m_tasks.PushFront(routine);
}
threads::IRoutine * PopFront()
{
return m_tasks.Front(true);
}
void Stop()
{
m_tasks.Cancel();
for (auto & thread : m_threads)
thread->Cancel();
m_threads.clear();
m_tasks.ProcessList([this](std::list<threads::IRoutine *> & tasks)
{
FinishTasksOnStop(tasks);
});
m_tasks.Clear();
}
private:
void FinishTasksOnStop(std::list<threads::IRoutine *> & tasks)
{
typedef std::list<threads::IRoutine *>::iterator task_iter;
for (task_iter it = tasks.begin(); it != tasks.end(); ++it)
{
(*it)->Cancel();
m_finishFn(*it);
}
}
private:
ThreadedList<threads::IRoutine *> m_tasks;
TFinishRoutineFn m_finishFn;
std::vector<std::unique_ptr<threads::Thread>> m_threads;
};
ThreadPool::ThreadPool(size_t size, const TFinishRoutineFn & finishFn)
: m_impl(new Impl(size, finishFn)) {}
ThreadPool::~ThreadPool()
{
delete m_impl;
}
void ThreadPool::PushBack(threads::IRoutine * routine)
{
m_impl->PushBack(routine);
}
void ThreadPool::PushFront(IRoutine * routine)
{
m_impl->PushFront(routine);
}
void ThreadPool::Stop()
{
m_impl->Stop();
}
} // namespace routine
namespace routine_simple
{
ThreadPool::ThreadPool(size_t reserve) { m_pool.reserve(reserve); }
void ThreadPool::Add(std::unique_ptr<threads::IRoutine> && routine)
{
m_pool.emplace_back(new threads::Thread());
m_pool.back()->Create(move(routine));
}
void ThreadPool::Join()
{
for (auto & thread : m_pool)
thread->Join();
}
threads::IRoutine * ThreadPool::GetRoutine(size_t i) const { return m_pool[i]->GetRoutine(); }
} // namespace routine_simple
} // namespace thread_pool
} // namespace base
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