arm_compute/runtime/IFunction.h

/*
 * Copyright (c) 2016-2021 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
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef ARM_COMPUTE_IFUNCTION_H
#define ARM_COMPUTE_IFUNCTION_H

namespace arm_compute
{
/** Base class for all functions */
class IFunction
{
public:
    /** Destructor */
    virtual ~IFunction() = default;
    /** Run the kernels contained in the function
     *
     * For CPU kernels:
     * - Multi-threading is used for the kernels which are parallelisable.
     * - By default std::thread::hardware_concurrency() threads are used.
     *
     * @note @ref CPPScheduler::set_num_threads() can be used to manually set the number of threads
     *
     * For OpenCL kernels:
     * - All the kernels are enqueued on the queue associated with CLScheduler.
     * - The queue is then flushed.
     *
     * @note The function will not block until the kernels are executed. It is the user's responsibility to wait.
     * @note Will call prepare() on first run if hasn't been done
     */
    virtual void run() = 0;
    /** Prepare the function for executing
     *
     * Any one off pre-processing step required by the function is handled here
     *
     * @note Prepare stage might not need all the function's buffers' backing memory to be available in order to execute
     */
    virtual void prepare()
    {
    }
};
}
#endif /*ARM_COMPUTE_IFUNCTION_H */