Make assertions thread-safe

benchmarks/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_executable(benchmarks catch_benchmarks.cpp)
+target_link_libraries(benchmarks PRIVATE Catch2WithMain)
+target_compile_features(benchmarks PUBLIC cxx_std_17)

benchmarks/catch_benchmarks.cpp

@@ -0,0 +1,25 @@
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/benchmark/catch_benchmark.hpp>
+
+#include <mutex>
+
+std::recursive_mutex global_lock;
+
+int no_lock() {
+    return 2;
+}
+
+int take_lock() {
+    std::unique_lock<std::recursive_mutex> lock(global_lock);
+    return 2;
+}
+
+TEST_CASE("std::recursive_mutex overhead benchmark", "[benchmark][mutex]") {
+    BENCHMARK("no lock") {
+        return no_lock();
+    };
+
+    BENCHMARK("with std::recursive_mutex") {
+        return take_lock();
+    };
+}