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enforce memory order to avoid crash on Ampere #34386

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Jul 8, 2021
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2 changes: 2 additions & 0 deletions RecoPixelVertexing/PixelTriplets/plugins/GPUCACell.h
Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,7 @@ class GPUCACell {
auto i = cellNeighbors.extend(); // maybe wasted....
if (i > 0) {
cellNeighbors[i].reset();
__threadfence();
#ifdef __CUDACC__
auto zero = (PtrAsInt)(&cellNeighbors[0]);
atomicCAS((PtrAsInt*)(&theOuterNeighbors),
Expand All @@ -89,6 +90,7 @@ class GPUCACell {
auto i = cellTracks.extend(); // maybe wasted....
if (i > 0) {
cellTracks[i].reset();
__threadfence();
#ifdef __CUDACC__
auto zero = (PtrAsInt)(&cellTracks[0]);
atomicCAS((PtrAsInt*)(&theTracks), zero, (PtrAsInt)(&cellTracks[i])); // if fails we cannot give "i" back...
Expand Down