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/*
* Copyright (c) 2016-2020 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef ARM_COMPUTE_CPPSCHEDULER_H
#define ARM_COMPUTE_CPPSCHEDULER_H
#include "arm_compute/core/experimental/Types.h"
#include "arm_compute/runtime/IScheduler.h"
#include <memory>
namespace arm_compute
{
/** C++11 implementation of a pool of threads to automatically split a kernel's execution among several threads. */
class CPPScheduler final : public IScheduler
{
public:
/** Constructor: create a pool of threads. */
CPPScheduler();
/** Default destructor */
~CPPScheduler();
/** Sets the number of threads the scheduler will use to run the kernels.
*
* @param[in] num_threads If set to 0, then the maximum number of threads supported by C++11 will be used, otherwise the number of threads specified.
*/
void set_num_threads(unsigned int num_threads) override;
/** Returns the number of threads that the CPPScheduler has in his pool.
*
* @return Number of threads available in CPPScheduler.
*/
unsigned int num_threads() const override;
/** Access the scheduler singleton
*
* @note this method has been deprecated and will be remover in the upcoming releases
* @return The scheduler
*/
static CPPScheduler &get();
/** Multithread the execution of the passed kernel if possible.
*
* The kernel will run on a single thread if any of these conditions is true:
* - ICPPKernel::is_parallelisable() returns false
* - The scheduler has been initialized with only one thread.
*
* @param[in] kernel Kernel to execute.
* @param[in] hints Hints for the scheduler.
*/
void schedule(ICPPKernel *kernel, const Hints &hints) override;
/** Multithread the execution of the passed kernel if possible.
*
* The kernel will run on a single thread if any of these conditions is true:
* - ICPPKernel::is_parallelisable() returns false
* - The scheduler has been initialized with only one thread.
*
* @param[in] kernel Kernel to execute.
* @param[in] hints Hints for the scheduler.
* @param[in] inputs Vector that contains the input tensors.
* @param[in] outputs Vector that contains the output tensors.
*/
void schedule_op(ICPPKernel *kernel, const Hints &hints, const InputTensorMap &inputs, const OutputTensorMap &outputs) override;
protected:
/** Will run the workloads in parallel using num_threads
*
* @param[in] workloads Workloads to run
*/
void run_workloads(std::vector<Workload> &workloads) override;
private:
void schedule_common(ICPPKernel *kernel, const Hints &hints, const InputTensorMap &inputs, const OutputTensorMap &outputs);
struct Impl;
std::unique_ptr<Impl> _impl;
};
} // namespace arm_compute
#endif /* ARM_COMPUTE_CPPSCHEDULER_H */
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