## Motivation
Looks like the Rust 1.48.0 version of `rustfmt` changed some formatting
rules (fixed some bugs?), and some of the code in `tokio-macros` is no
longer correctly formatted. This is breaking CI.
## Solution
This commit runs rustfmt on Rust 1.48.0. This fixes CI.
Closes#3158
Adds `ready()`, `readable()`, and `writable()` async methods for waiting
for socket readiness. Adds `try_send`, `try_send_to`, `try_recv`, and
`try_recv_from` for performing non-blocking operations on the socket.
This is the UDP equivalent of #3130.
This PR makes `Notify::notify_waiters` public. The method
already exists, but it changes the way `notify_waiters`,
is used. Previously in order for the consumer to
register interest, in a notification triggered by
`notify_waiters`, the `Notified` future had to be
polled. This introduced friction when using the api
as the future had to be pinned before polled.
This change introduces a counter that tracks how many
times `notified_waiters` has been called. Upon creation of
the future the number of times is loaded. When first
polled the future compares this number with the count
state of the `Notify` type. This avoids the need for
registering the waiter upfront.
Fixes: #3066
This commit adds `set_{send, recv}_buffer_size` methods to `TcpSocket`
for setting the size of the TCP send and receive buffers, and `{send,
recv}_buffer_size` methods for returning the current value. These just
call into similar methods on `mio`'s `TcpSocket` type, which were added
in tokio-rs/mio#1384.
Refs: #3082
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Adds function to await for readiness on the TcpStream and non-blocking read/write functions.
`async fn TcpStream::ready(Interest)` waits for socket readiness satisfying **any** of the specified
interest. There are also two shorthand functions, `readable()` and `writable()`.
Once the stream is in a ready state, the caller may perform non-blocking operations on it using
`try_read()` and `try_write()`. These function return `WouldBlock` if the stream is not, in fact, ready.
The await readiness function are similar to `AsyncFd`, but do not require a guard. The guard in
`AsyncFd` protect against a potential race between receiving the readiness notification and clearing
it. The guard is needed as Tokio does not control the operations. With `TcpStream`, the `try_read()`
and `try_write()` function handle clearing stream readiness as needed.
This also exposes `Interest` and `Ready`, both defined in Tokio as wrappers for Mio types. These
types will also be useful for fixing #3072 .
Other I/O types, such as `TcpListener`, `UdpSocket`, `Unix*` should get similar functions, but this
is left for later PRs.
Refs: #3130
* Removes duplicated code by moving it to `Registration`.
* impl `Deref` for `PollEvented` to avoid `get_ref()`.
* Avoid extra waker clones in I/O driver.
* Add `Interest` wrapper around `mio::Interest`.
## Motivation
Some small cleanup items are apparent after merge of #2951
## Solution
Delete a now incorrect comment in Cargo.toml, and remove a now redundant CI test step.
This removes the last slab dependency by replacing the current slab-based
JoinHandle tracking with one based on HashMap instead.
Co-authored-by: Bryan Donlan <bdonlan@amazon.com>
## Motivation
Currently, the per-task `tracing` spans generated by tokio's `tracing`
feature flag include the `std::any::type_name` of the future that was
spawned. When future combinators and/or libraries like Tower are in use,
these future names can get _quite_ long. Furthermore, when formatting
the `tracing` spans with their parent spans as context, any other task
spans in the span context where the future was spawned from can _also_
include extremely long future names.
In some cases, this can result in extremely high memory use just to
store the future names. For example, in Linkerd, when we enable
`tokio=trace` to enable the task spans, there's a spawned task whose
future name is _232990 characters long_. A proxy with only 14 spawned
tasks generates a task list that's over 690 KB. Enabling task spans
under load results in the process getting OOM killed very quickly.
## Solution
This branch removes future type names from the spans generated by
`spawn`. As a replacement, to allow identifying which `spawn` call a
span corresponds to, the task span now contains the source code location
where `spawn` was called, when the compiler supports the
`#[track_caller]` attribute. Since `track_caller` was stabilized in Rust
1.46.0, and our minimum supported Rust version is 1.45.0, we can't
assume that `#[track_caller]` is always available. Instead, we have a
RUSTFLAGS cfg, `tokio_track_caller`, that guards whether or not we use
it. I've also added a `build.rs` that detects the compiler minor
version, and sets the cfg flag automatically if the current compiler
version is >= 1.46. This means users shouldn't have to enable
`tokio_track_caller` manually.
Here's the trace output from the `chat` example, before this change:
...and after:
Closes#3073
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
This reverts commit fe2b997.
We are avoiding adding poll_read_buf to tokio itself for now. The patch is
reverted now in order to not block the v0.3.2 release (#3059).
