feat(linear-static-3d-euler-beam): step 17 - parallel-for-tbb

src/fesa/CMakeLists.txt

@@ -3,6 +3,7 @@ add_library(
     STATIC
     analysis/analysis_model.cpp
     analysis/analysis_state.cpp
+    assembly/parallel_for.cpp
     build_info.cpp
     core/diagnostic.cpp
     core/status.cpp
@@ -25,6 +26,7 @@ target_link_libraries(
     fesa_solver
     PRIVATE
         Fesa::MKL
+        Fesa::TBB
 )
 
 # Product warnings are strict without imposing FESA policy on external targets.

src/fesa/assembly/parallel_for.cpp

@@ -0,0 +1,30 @@
+#include "fesa/assembly/parallel_for.hpp"
+
+#include <oneapi/tbb/parallel_for.h>
+
+namespace fesa {
+
+void SerialParallelFor::execute(
+    std::size_t count,
+    const std::function<void(std::size_t)>& body) const {
+    for (std::size_t index = 0; index < count; ++index) {
+        body(index);
+    }
+}
+
+void TbbParallelFor::execute(
+    std::size_t count,
+    const std::function<void(std::size_t)>& body) const {
+    if (count == 0U) {
+        return;
+    }
+
+    // Use oneTBB's caller-scoped scheduler policy. This adapter does not set
+    // process-wide concurrency or override the later MKL/TBB oversubscription
+    // policy. A body exception cancels sibling tasks and is rethrown; work
+    // already running during cancellation may still finish its indexed slot.
+    oneapi::tbb::parallel_for(
+        std::size_t{0}, count, [&body](std::size_t index) { body(index); });
+}
+
+} // namespace fesa