Migrate to stdexec & Fix deadlock on HPX worker threads

.clang-tidy

@@ -15,6 +15,7 @@ Checks: >
     -bugprone-easily-swappable-parameters,
     -bugprone-reserved-identifier,
     -bugprone-lambda-function-name,
+    -bugprone-unchecked-optional-access,
     modernize-use-nullptr,
     misc-assert-side-effect
     misc-dangling-handle

.github/workflows/build-and-test.yml

@@ -21,7 +21,7 @@ concurrency:
 jobs:
   configure-core-core_local-components:
     runs-on: ubuntu-latest
-    container: stellargroup/build_env:17
+    container: stellargroup/build_env:19
     outputs:
       test_matrix: ${{ steps.gen_matrix.outputs.matrix }}
 
@@ -60,7 +60,7 @@ jobs:
             -DHPX_WITH_COMPILER_WARNINGS=On \
             -DHPX_WITH_COMPILER_WARNINGS_AS_ERRORS=On \
             -DHPX_WITH_DEPRECATION_WARNINGS=On \
-            -DCMAKE_CXX_CLANG_TIDY=clang-tidy-20 \
+            -DCMAKE_CXX_CLANG_TIDY=clang-tidy-21 \
             -DHPX_WITH_THREAD_LOCAL_STORAGE=On \
             -DHPX_WITH_STACKTRACES_STATIC_SYMBOLS=On \
             -DHPX_WITH_STACKTRACES_DEMANGLE_SYMBOLS=Off \
@@ -116,7 +116,7 @@ jobs:
   tests-dynamic:
     needs: configure-core-core_local-components
     runs-on: ubuntu-latest
-    container: stellargroup/build_env:17
+    container: stellargroup/build_env:19
     name: ${{ matrix.name }} (${{ matrix.count }} tests)
     strategy:
       fail-fast: false
@@ -134,4 +134,4 @@ jobs:
           build-artifact-name: hpx-build-${{ github.sha }}
           build-targets: ${{ matrix.targets }}
           ctest-regex: ${{ matrix.tests }}
-          artifact-job-name: ${{ matrix.name }}
+          artifact-job-name: ${{ matrix.name }}

.github/workflows/linux_debug_modules.yml → .github/workflows/linux_release_modules.yml

@@ -1,11 +1,11 @@
 # Copyright (c) 2020 ETH Zurich
-# Copyright (c) 2024 The STE||AR Group
+# Copyright (c) 2024-2026 The STE||AR Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-name: Linux CI (Debug, C++20 Modules)
+name: Linux CI (Release, C++20 Modules)
 
 on: [pull_request]
 
@@ -16,7 +16,7 @@ concurrency:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container: stellargroup/build_env:19
+    container: stellargroup/build_env:22
 
     steps:
     - uses: actions/checkout@v6
@@ -28,7 +28,7 @@ jobs:
               -Bbuild \
               -GNinja \
               -DHPX_WITH_CXX_STANDARD=23 \
-              -DCMAKE_BUILD_TYPE=Debug \
+              -DCMAKE_BUILD_TYPE=Release \
               -DHPX_WITH_MALLOC=system \
               -DHPX_WITH_FETCH_ASIO=ON \
               -DHPX_WITH_ASIO_TAG=asio-1-34-2 \
@@ -37,8 +37,10 @@ jobs:
               -DHPX_WITH_TESTS_MAX_THREADS_PER_LOCALITY=2 \
               -DHPX_WITH_VERIFY_LOCKS=ON \
               -DHPX_WITH_VERIFY_LOCKS_BACKTRACE=ON \
-              -DHPX_WITH_CHECK_MODULE_DEPENDENCIES=On \
-              -DHPX_WITH_CXX_MODULES=ON
+              -DHPX_WITH_CHECK_MODULE_DEPENDENCIES=ON \
+              -DHPX_WITH_CXX_MODULES=ON \
+              -DHPX_WITH_DATAPAR=ON \
+              -DHPX_WITH_DATAPAR_BACKEND=EMULATE
     - name: Build
       shell: bash
       run: |

.github/workflows/macos_debug.yml

@@ -1,5 +1,5 @@
 # Copyright (c) 2020 Mikael Simberg
-# Copyright (c) 2024 The STE||AR Group
+# Copyright (c) 2024-2026 The STE||AR Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -44,7 +44,7 @@ jobs:
       shell: bash
       run: |
           cmake --build build --target all
-          cmake --build build --target tests
+          cmake --build build --target tests -- -k 0
     - name: Test
       shell: bash
       run: |
@@ -83,4 +83,5 @@ jobs:
           tests.unit.modules.executors.limiting_executor|\
           tests.unit.modules.compute_local.block_fork_join_executor|\
           tests.unit.modules.algorithms.algorithms.all_of|\
-          tests.unit.modules.algorithms.algorithms.any_of"
+          tests.unit.modules.algorithms.algorithms.any_of|\
+          tests.unit.modules.algorithms.algorithms.uninitialized_relocate_sender"

.github/workflows/macos_debug_fetch_boost.yml

@@ -42,7 +42,7 @@ jobs:
       shell: bash
       run: |
           cmake --build build --target all
-          cmake --build build --target tests
+          cmake --build build --target tests -- -k 0
     - name: Test
       shell: bash
       run: |

.github/workflows/macos_debug_fetch_hwloc.yml

@@ -1,5 +1,5 @@
 # Copyright (c) 2024 Vedant Nimje
-# Copyright (c) 2024 The STE||AR Group
+# Copyright (c) 2024-2026 The STE||AR Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -48,7 +48,7 @@ jobs:
       shell: bash
       run: |
           cmake --build build --target all
-          cmake --build build --target tests
+          cmake --build build --target tests -- -k 0
     - name: Test
       shell: bash
       run: |

libs/core/algorithms/include/hpx/parallel/algorithms/find.hpp

@@ -1356,7 +1356,7 @@ namespace hpx::parallel {
                         HPX_FORWARD(Proj1, proj1), HPX_FORWARD(Proj2, proj2));
                 };
 
-                auto f2 = [tok, first1](
+                auto f2 = [tok, first1, last1](
                               auto&&... data) mutable -> Iter1 {
                     static_assert(sizeof...(data) < 2);
 
@@ -1366,6 +1366,11 @@ namespace hpx::parallel {
 
                     difference_type find_end_res = tok.get_data();
 
+                    if (find_end_res < 0)
+                    {
+                        return advance_to_sentinel(first1, last1);
+                    }
+
                     std::advance(first1, find_end_res);
                     return first1;
                 };

libs/core/algorithms/include/hpx/parallel/algorithms/remove.hpp

@@ -449,7 +449,9 @@ namespace hpx {
             using Type = typename std::iterator_traits<FwdIter>::value_type;
 
             return hpx::remove_if(HPX_FORWARD(ExPolicy, policy), first, last,
-                [value](Type const& a) -> bool { return value == a; });
+                [value](Type const& a) -> bool {
+                    return static_cast<Type>(value) == a;
+                });
         }
     } remove{};
 }    // namespace hpx