@safe setter for driver

[MartinNowak]

Track number of open files/sockets in driver to allow @safe setting/swapping of the IO Driver.

[schveiguy]

You may be able to migrate the open files as well, if you pull them out of the current driver as file descriptors, and open them in the new driver.

[MartinNowak]

That meant keeping track of all open files within the driver, not a reasonable option. Also driver changes don't seem to have a use-case.
Furthermore an async driver would mark sockets as non-blocking during opening, migrating such flags seems unfeasible either.

[schveiguy]

I actually meant manually, not automatically . I’m thinking of the standard handles which you don’t want to close.

[schveiguy]

Regarding changing flags, the driver already supports opening with a file descriptor, so it has to deal with that already.

[schveiguy]

I agree that changing drivers mid-program doesn't really have a great use case. However, it should be supported on entry to main.

[anon17]

btw, you can store shared driver in TLS:

struct LocalShared(T)
{
	shared T value;
	alias value this;
}
LocalShared!Driver _driver;