---
id: pr-cccl-cub-3671
repo: NVIDIA/cccl
pr: 3671
title: '[libcudacxx] Stable abstraction for Blackwell work-stealing (PTX try_cancel)'
author: gonzalobg
date: '2025-02-20'
url: https://github.com/NVIDIA/cccl/pull/3671
source_category: upstream-code
architectures:
- sm100
tags:
- blackwell
techniques: []
hardware_features:
- blackwell
kernel_types: []
languages:
- cuda-cpp
- ptx
captured_at: '2026-05-16'
status: merged
merge_sha: 180e6c07eca837a0ca777f2906e6f8dbb0dced22
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- docs/libcudacxx/extended_api.rst
- docs/libcudacxx/extended_api/work_stealing.rst
- libcudacxx/include/cuda/__functional/for_each_canceled.h
- libcudacxx/include/cuda/work_stealing
- libcudacxx/test/libcudacxx/cuda/work_stealing/for_each_canceled/for_each_canceled.pass.cpp
artifact_dir: evidence/pull-bundles/cccl-cub/gh-3671
head_ref_oid: 990bb8532dec72e0a7550bf3bf90fd75bd39a8bc
---
# [libcudacxx] Stable abstraction for Blackwell work-stealing (PTX try_cancel)

- Repository: `NVIDIA/cccl`
- PR: [3671](https://github.com/NVIDIA/cccl/pull/3671)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `docs/libcudacxx/extended_api.rst`
- `docs/libcudacxx/extended_api/work_stealing.rst`
- `libcudacxx/include/cuda/__functional/for_each_canceled.h`
- `libcudacxx/include/cuda/work_stealing`
- `libcudacxx/test/libcudacxx/cuda/work_stealing/for_each_canceled/for_each_canceled.pass.cpp`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-3671`
