forked from OSchip/llvm-project
52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
//===--------- statequeue.h - NVPTX OpenMP GPU State Queue ------- CUDA -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a queue to hand out OpenMP state objects to teams of
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// one or more kernels.
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//
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// Reference:
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// Thomas R.W. Scogland and Wu-chun Feng. 2015.
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// Design and Evaluation of Scalable Concurrent Queues for Many-Core
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// Architectures. International Conference on Performance Engineering.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __STATE_QUEUE_H
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#define __STATE_QUEUE_H
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#include <stdint.h>
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#include "target_impl.h"
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template <typename ElementType, uint32_t SIZE> class omptarget_nvptx_Queue {
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private:
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ElementType elements[SIZE];
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volatile ElementType *elementQueue[SIZE];
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volatile uint32_t head;
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volatile uint32_t ids[SIZE];
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volatile uint32_t tail;
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static const uint32_t MAX_ID = (1u << 31) / SIZE / 2;
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INLINE uint32_t ENQUEUE_TICKET();
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INLINE uint32_t DEQUEUE_TICKET();
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INLINE static uint32_t ID(uint32_t ticket);
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INLINE bool IsServing(uint32_t slot, uint32_t id);
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INLINE void PushElement(uint32_t slot, ElementType *element);
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INLINE ElementType *PopElement(uint32_t slot);
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INLINE void DoneServing(uint32_t slot, uint32_t id);
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public:
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INLINE omptarget_nvptx_Queue() {}
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INLINE void Enqueue(ElementType *element);
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INLINE ElementType *Dequeue();
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};
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#include "state-queuei.h"
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#endif
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