Thanks. It is unsurprising that most libraries punt on that. It seems that switching this state would easily dominate over the cost switching. IIRC on gcc the c

Thanks. It is unsurprising that most libraries punt on that. It seems that switching this state would easily dominate over the cost switching. IIRC on gcc the current exception is protected by a global mutex, at least until recently. It is another reason for having this built into the language/standard library so that it can be implemented optimally.