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#ifndef HeterogeneousCore_AlpakaCore_interface_QueueCache_h
#define HeterogeneousCore_AlpakaCore_interface_QueueCache_h
#include <memory>
#include <vector>
#include <alpaka/alpaka.hpp>
#include "FWCore/Utilities/interface/ReusableObjectHolder.h"
#include "FWCore/Utilities/interface/thread_safety_macros.h"
#include "HeterogeneousCore/AlpakaInterface/interface/config.h"
#include "HeterogeneousCore/AlpakaInterface/interface/devices.h"
#include "HeterogeneousCore/AlpakaInterface/interface/AlpakaServiceFwd.h"
namespace cms::alpakatools {
template <typename Queue>
class QueueCache {
#ifdef ALPAKA_ACC_GPU_CUDA_ENABLED
friend class alpaka_cuda_async::AlpakaService;
#endif
#ifdef ALPAKA_ACC_GPU_HIP_ENABLED
friend class alpaka_rocm_async::AlpakaService;
#endif
#ifdef ALPAKA_ACC_CPU_B_SEQ_T_SEQ_ENABLED
friend class alpaka_serial_sync::AlpakaService;
#endif
#ifdef ALPAKA_ACC_CPU_B_TBB_T_SEQ_ENABLED
friend class alpaka_tbb_async::AlpakaService;
#endif
using Device = alpaka::Dev<Queue>;
using Platform = alpaka::Platform<Device>;
public:
// QueueCache should be constructed by the first call to
// getQueueCache() only if we have any devices present
QueueCache() : cache_(devices<Platform>().size()) {}
// Gets a (cached) queue for the current device. The queue
// will be returned to the cache by the shared_ptr destructor.
// This function is thread safe
std::shared_ptr<Queue> get(Device const& dev) {
return cache_[alpaka::getNativeHandle(dev)].makeOrGet([dev]() { return std::make_unique<Queue>(dev); });
}
private:
// not thread safe, intended to be called only from AlpakaService
void clear() {
// Reset the contents of the caches, but leave an
// edm::ReusableObjectHolder alive for each device. This is needed
// mostly for the unit tests, where the function-static
// QueueCache lives through multiple tests (and go through
// multiple shutdowns of the framework).
cache_.clear();
cache_.resize(devices<Platform>().size());
}
std::vector<edm::ReusableObjectHolder<Queue>> cache_;
};
// Gets the global instance of a QueueCache
// This function is thread safe
template <typename Queue>
QueueCache<Queue>& getQueueCache() {
// the public interface is thread safe
CMS_THREAD_SAFE static QueueCache<Queue> cache;
return cache;
}
} // namespace cms::alpakatools
#endif // HeterogeneousCore_AlpakaCore_interface_QueueCache_h
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