Availability:C-language interface function
void PL_WITH_ENGINE(PL_engine_t
e)This macro implements a C for-loop where the body is executed
with the engine e as current engine. The body is executed
exactly once. After completion of the body the current engine of the
calling thread is restored to old state (either the old current engine
or no engine). The user may use break to terminate the body
early. The user may not use return. Using return
does not reset the old engine.