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81 lines
2.9 KiB
Plaintext
81 lines
2.9 KiB
Plaintext
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Simple kernel demonstrating atomic functions in device code. */
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#ifndef _SIMPLEATOMICS_KERNEL_H_
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#define _SIMPLEATOMICS_KERNEL_H_
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////////////////////////////////////////////////////////////////////////////////
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//! Simple test kernel for atomic instructions
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//! @param g_idata input data in global memory
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//! @param g_odata output data in global memory
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////////////////////////////////////////////////////////////////////////////////
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extern "C" __global__ void testKernel(int *g_odata) {
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// access thread id
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const unsigned int tid = blockDim.x * blockIdx.x + threadIdx.x;
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// Test various atomic instructions
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// Arithmetic atomic instructions
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// Atomic addition
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atomicAdd(&g_odata[0], 10);
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// Atomic subtraction (final should be 0)
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atomicSub(&g_odata[1], 10);
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// Atomic exchange
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atomicExch(&g_odata[2], tid);
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// Atomic maximum
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atomicMax(&g_odata[3], tid);
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// Atomic minimum
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atomicMin(&g_odata[4], tid);
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// Atomic increment (modulo 17+1)
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atomicInc((unsigned int *)&g_odata[5], 17);
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// Atomic decrement
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atomicDec((unsigned int *)&g_odata[6], 137);
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// Atomic compare-and-swap
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atomicCAS(&g_odata[7], tid - 1, tid);
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// Bitwise atomic instructions
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// Atomic AND
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atomicAnd(&g_odata[8], 2 * tid + 7);
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// Atomic OR
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atomicOr(&g_odata[9], 1 << tid);
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// Atomic XOR
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atomicXor(&g_odata[10], tid);
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}
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#endif // #ifndef _SIMPLEATOMICS_KERNEL_H_
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