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#ifndef HeterogeneousCore_AlpakaInterface_interface_HostOnlyTask_h
#define HeterogeneousCore_AlpakaInterface_interface_HostOnlyTask_h
#include <functional>
#include <memory>
#include <fmt/format.h>
#include <alpaka/alpaka.hpp>
namespace alpaka {
//! A task that is guaranted not to call any GPU-ralated APIs
//!
//! These tasks can be enqueued directly to the native GPU queues, without the use of a
//! dedicated host-side worker thread.
class HostOnlyTask {
public:
HostOnlyTask(std::function<void(std::exception_ptr)> task) : task_(std::move(task)) {}
void operator()(std::exception_ptr eptr) const { task_(eptr); }
private:
std::function<void(std::exception_ptr)> task_;
};
namespace trait {
#ifdef ALPAKA_ACC_GPU_CUDA_ENABLED
//! The CUDA async queue enqueue trait specialization for "safe tasks"
template <>
struct Enqueue<QueueCudaRtNonBlocking, HostOnlyTask> {
using TApi = ApiCudaRt;
static void CUDART_CB callback(cudaStream_t queue, cudaError_t status, void* arg) {
std::unique_ptr<HostOnlyTask> pTask(static_cast<HostOnlyTask*>(arg));
if (status == cudaSuccess) {
(*pTask)(nullptr);
} else {
// wrap the exception in a try-catch block to let GDB "catch throw" break on it
try {
throw std::runtime_error(fmt::format("CUDA error: callback of stream {} received error {}: {}.",
fmt::ptr(queue),
cudaGetErrorName(status),
cudaGetErrorString(status)));
} catch (std::exception&) {
// pass the exception to the task
(*pTask)(std::current_exception());
}
}
}
ALPAKA_FN_HOST static auto enqueue(QueueCudaRtNonBlocking& queue, HostOnlyTask task) -> void {
auto pTask = std::make_unique<HostOnlyTask>(std::move(task));
ALPAKA_UNIFORM_CUDA_HIP_RT_CHECK(
cudaStreamAddCallback(alpaka::getNativeHandle(queue), callback, static_cast<void*>(pTask.release()), 0u));
}
};
#endif // ALPAKA_ACC_GPU_CUDA_ENABLED
#ifdef ALPAKA_ACC_GPU_HIP_ENABLED
//! The HIP async queue enqueue trait specialization for "safe tasks"
template <>
struct Enqueue<QueueHipRtNonBlocking, HostOnlyTask> {
using TApi = ApiHipRt;
static void callback(hipStream_t queue, hipError_t status, void* arg) {
std::unique_ptr<HostOnlyTask> pTask(static_cast<HostOnlyTask*>(arg));
if (status == hipSuccess) {
(*pTask)(nullptr);
} else {
// wrap the exception in a try-catch block to let GDB "catch throw" break on it
try {
throw std::runtime_error(fmt::format("HIP error: callback of stream {} received error {}: {}.",
fmt::ptr(queue),
hipGetErrorName(status),
hipGetErrorString(status)));
} catch (std::exception&) {
// pass the exception to the task
(*pTask)(std::current_exception());
}
}
}
ALPAKA_FN_HOST static auto enqueue(QueueHipRtNonBlocking& queue, HostOnlyTask task) -> void {
auto pTask = std::make_unique<HostOnlyTask>(std::move(task));
ALPAKA_UNIFORM_CUDA_HIP_RT_CHECK(
hipStreamAddCallback(alpaka::getNativeHandle(queue), callback, static_cast<void*>(pTask.release()), 0u));
}
};
#endif // ALPAKA_ACC_GPU_HIP_ENABLED
} // namespace trait
} // namespace alpaka
#endif // HeterogeneousCore_AlpakaInterface_interface_HostOnlyTask_h
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