Merge pull request #1465 from DavidElesTheFox/bugfix/static-thread-pool-on-thread-fix

Bug:  static_thread_pool::get_scheduler_on_thread causes SegFault

Author: ericniebler

include/exec/static_thread_pool.hpp

@@ -407,7 +407,7 @@ namespace exec {
 
         static_thread_pool_* pool_;
         remote_queue* queue_;
-        const nodemask* nodemask_;
+        const nodemask* nodemask_ = &nodemask::any();
         std::size_t thread_idx_{std::numeric_limits<std::size_t>::max()};
 
        public:

test/exec/CMakeLists.txt

@@ -44,6 +44,7 @@ set(exec_test_sources
     test_trampoline_scheduler.cpp
     test_sequence_senders.cpp
     test_sequence.cpp
+    test_static_thread_pool.cpp
     test_just_from.cpp
     sequence/test_any_sequence_of.cpp
     sequence/test_empty_sequence.cpp

test/exec/test_static_thread_pool.cpp

@@ -0,0 +1,22 @@
+#include "catch2/catch.hpp"
+#include <exec/static_thread_pool.hpp>
+#include <stdexec/execution.hpp>
+
+#include <thread>
+#include <unordered_set>
+namespace ex = stdexec;
+
+TEST_CASE(
+  "static_thread_pool::get_scheduler_on_thread Test start on a specific thread",
+  "[types][static_thread_pool]") {
+  constexpr const size_t num_of_threads = 5;
+  exec::static_thread_pool pool{num_of_threads};
+
+  std::unordered_set<std::thread::id> thread_ids;
+  for (size_t i = 0; i < num_of_threads; ++i) {
+    auto sender = ex::schedule(pool.get_scheduler_on_thread(i))
+                | ex::then([&] { thread_ids.insert(std::this_thread::get_id()); });
+    ex::sync_wait(std::move(sender));
+  }
+  REQUIRE(thread_ids.size() == num_of_threads);
+}