> If threads aren't interesting except for parallelism, what do you think people were using them for the multiple decades when the vast majority of people were

> If threads aren't interesting except for parallelism, what do you think people were using them for the multiple decades when the vast majority of people were running single-cored uniprocessor systems? They largely weren't. POSIX threads weren't standardized and widely adopted until the 90s, and it wasn't until multi-processor systems became more prevalent that threads saw wide adoption at all.