enter() now returns a guard, and the builder got revamped to make the
choice between MT and current thread explicit.
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
- do not "double"-block_in_place() (it may not be nested)
- do not call block_in_place() in non-worker threads
is_in_tokio() isn't sufficient, we need to actually know
that we're in a worker-thread, so we do this by remembering
that we're blocking.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
tokio now has Handle::try_current() allowing us to
generally check for a tokio runtime even if spawned by
someone else
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>