>Whats a good language that shows off the style you're suggesting?
javascript.
What you describe sounds like native UI work since forever before javascript. "Don't block the main thread" and all that.
Javascript is diferent in that it's a single-thread with an event loop. Synchronous functions execute until they end. Asynchronous functions are handled by the event loop which "loops" between the pool and runs each one for some time, then switches to other, concurrenly (think round robin). What happens when the runtime is running an asynchronous function and inside it reaches a synchronous one? it stops round-robin and executes this function until it ends.
What OP wants is a language like javascript but without having to write code distinguishing synchronous and asynchronous functions and instead having some other tool to tell the runtime when a function is synchronous or asynchronous without having to write it again.
Yes, I realize all this. My question is how you can have such a system and still keep UI thread synchronization without having the opposite problem of marking all your synchronous methods.
in a strict language? I don't think it's possible. Because if you take a better look you'll see that it's not enough to mark functions as sync or async since inside the functions each line of code can be considered a synchronous function in it's own.
What you want is something like Haskell that's lazy and its not about "executing statements" but rather "evaluting expressions".
What you describe sounds like native UI work since forever before javascript. "Don't block the main thread" and all that.
Javascript is diferent in that it's a single-thread with an event loop. Synchronous functions execute until they end. Asynchronous functions are handled by the event loop which "loops" between the pool and runs each one for some time, then switches to other, concurrenly (think round robin). What happens when the runtime is running an asynchronous function and inside it reaches a synchronous one? it stops round-robin and executes this function until it ends.
What OP wants is a language like javascript but without having to write code distinguishing synchronous and asynchronous functions and instead having some other tool to tell the runtime when a function is synchronous or asynchronous without having to write it again.