The docs for `Registration::new_with_interest_and_handle` (internal
function) included a reference to two old functions `new_with_interest`
and `new` on the same struct. These functions no longer exist, which
could be confusing.
Since there is currently only a single constructor function on
`Registration`, the misleading text has simply been removed.
A few spawn_blocking methods were implemented on a Handle struct that is
intended to hold all runtime driver handles. These methods make more
sense in the blocking module.
A step towards the goal of consolidating thread-local variables, this
patch removes the `time::Handle` reference from the time driver struct.
The reference is moved a level up and passed into methods that need it.
The end goal is to have a single `Driver` struct that holds each
sub-driver and a single `Handle` ref-counted struct that holds all the
misc handles. Further work on the time driver is blocked by some other
refactoring that will happen in follow-up patches.
Years ago, Tokio was organized as a cluster of separate crates. This
architecture required a trait to represent "park the thread and do
work.". When all crates were combined into a single crate, the `Park`
and `Unpark` traits remained as internal details.
This patch removes these traits as they are no longer needed. This is in
service of a future refactor that will decouple the various resource
drivers and store them in a single struct instead of nesting them.
However, in the mean time, removing the Park/Unpark traits adds a bit of
messy code to make the conditional compilation work. This code will
(hopefully) be short-lived.
This patch makes some minor refactors. It renames `ClockTime` to
`TimeSource` since that is how all variables refer to it. It also moves
the type into a new file.
Finally, it moves the `unpark` handle out of the mutex as it does not
need to be there. Note, the call to `unpark` is still called while the
mutex is held, so there is no functional change. Moving it out of the
mutex is in preparation for moving the unpark handle completely out of
the time driver.
This patch moves the time driver into the runtime module. The time driver
is a runtime concern and is only used by the runtime. Moving the drivers
is the first step to cleaning up some Tokio internals. There will be
follow-up patches that integrate the drivers and other runtime concerns
more closely.
This is an internal refactor and should not impact any public APIs.
Current documentation of `sync::watch::Sender::send` may be intepreted
as the method failing if at some point in past the channel has been
closed because every receiver has been dropped. This isn't true,
however, as the channel could have been reopened by using
`sync::watch::Sender::subscribe`.
This fix clarifies the behavior. Moreover, it is noted that on failure,
the value isn't made available to future subscribers (but returned as
part of the `SendError`).
Fixes#4957.
For historical reasons, the current-thread runtime's scheduler was named
BasicScheduler and the multi-thread runtime's scheduler were named
ThreadPool. This patch renames the schedulers to mirror the runtime
names to increase consistency. This patch also moves the scheduler
implementations into a new `runtime::scheduler` module.
This patch moves the I/O driver into the runtime module. The I/O driver
is a runtime concern and is only used by the runtime. Moving the driver
is the first step to cleaning up some Tokio internals. There will be
follow-up patches that integrate the I/O driver and other runtime concerns
more closely.
Because `Interest` and `Ready` are public APIs, they were moved to the
top-level `io` module instead of moving the types to `runtime`.
This is an internal refactor and should not impact any public APIs.
The multi-threaded scheduler includes a per-worker LIFO slot to
store the last scheduled task. This can improve certain usage patterns,
especially message passing between tasks. However, this LIFO slot is not
currently stealable.
Eventually, the LIFO slot **will** become stealable. However, as a
stop-gap, this unstable option lets users disable the LIFO task when
doing so improves their application's overall performance.
Refs: #4941
The command to build the documentation locally provided in the
Contribution Guide did not work for all crates in the project workspace.
Specifically, to build the docs for `tokio-stream` the flag `--cfg
docsrs` needs to be in the environment variable `RUSTFLAGS` in addition
to being in `RUSTDOCFLAGS`.
Additionally, there was text describing that the docs cannot be built
from the root of the workspace with a link to rust-lang/cargo#9274. That
issue has since been closed as complete and the listed commands do now
work from the root of the workspace. As such, that text has been
removed.
The documentation for`PollEvented` had a single remaining reference to
`Registration::clear_read_ready`, which no longer exists. This change
updates the documentation to refer to `Registration::clear_readiness`
instead.
Upgrade the nightly to a version that works with all of miri,
cargo-hack, minimal-versions, and cargo-check-external-types.
This is a prerequisite for #4902.
The broadcast channel allows multiple senders to send messages to
multiple receivers, where each receiver receives messages starting from
when it subscribes. After all senders are dropped, the receivers will
continue to receive all waiting messages in the buffer and then receive
a `Closed` error.
To mark that a channel has closed, it stores two closed flags, one on
the channel level and another in the buffer slot *after* the last used
slot (this may also be the earliest entry being kept for lagged
receivers, see #2425).
However, we don't need both closed flags, keeping the channel level
closed flag is sufficient.
Without the slot level closed flag, each receiver receives each message
until it is up to date and for that receiver the channel is empty. Then,
the actual return message is chosen depending on the channel level
closed flag; if the channel is NOT closed, then `Empty` is returned, if
the channel is closed then `Closed` is returned instead.
With the modified logic, there is no longer a need to append a closed
token to the internal buffer (by setting the slot level closed flag on
the next slot). This fixes the off by one error described in #4814,
which caused a receiver which was created after the channel was already
closed to get `Empty` from `try_recv` (or hang forever when calling
`recv`) instead of receiving `Closed`.
As a bonus, we save a single `bool` on each buffer slot.
Refs: #4814
Yotam Ofek