This was added in #37 as an optimization, but has since lead to many bugs. See
the issues #53, #57 and #60 for more information. I do not have the bandwidth
to address all of these bugs, so I'm taking the path of least resistance by
just removing the problematic code.
CLoses#53, #57 and #60
Signed-off-by: John Nunley <dev@notgull.net>
* Fix a bug where TLS would become None
The bug is invoked as follows:
- Runner 1 is created and stores the current version of the TLS
LOCAL_QUEUE variable, which is None.
- Runner 2 is also created. It stores the current version of the TLS
variable as well, which is Runner 1's queue.
- Runner 1 is dropped. It stores None into the LOCAL_QUEUE variable.
- Runner 2 tries to run. It reads from the LOCAL_QUEUE variable, sees
that it is None, and panics.
This could be solved by just not using the local queue if the variable
is None. However, we can do one better; if the slot is open, we can
optimize the runner by replacing it with our own queue. This should
allow for the local queue to be used more often.
Closes#54
Signed-off-by: John Nunley <dev@notgull.net>
This commit makes sure that the run() and tick() functions produce
futures that are Send and Sync, to prevent a regression introduced in
PR #37. Tests are also added to prevent this regression in the future.
Signed-off-by: John Nunley <dev@notgull.net>
This commit adds an optimization where a thread-local variable contains the queue of the
current runner. Rather than pushing to the global queue and hoping that a local queue
eventually picks it up, tasks are pushed directly to this local queue if available.
This has led to speedups of up to 70% in some cases and up to 10% in other workloads.
John Nunley
John Nunley
Taiki Endo
Stjepan Glavina
Marc-Antoine Perennou