Allow to re-use main thread as worker.
Test
run_tests
[ 86%] Linking CXX executable ../../bin/benchmark_matrix
[ 86%] Built target benchmark_matrix
Scanning dependencies of target tests
[ 89%] Building CXX object test/CMakeFiles/tests.dir/main.cpp.o
[ 93%] Building CXX object test/CMakeFiles/tests.dir/data_structures_test.cpp.o
[ 96%] Building CXX object test/CMakeFiles/tests.dir/scheduling_tests.cpp.o
[100%] Linking CXX executable ../bin/tests
[100%] Built target tests
ERROR: Job failed: execution took longer than 1h0m0s seconds