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This adds `AsyncWrite::poll_write_vectored`, and implements it for
`TcpStream` and `UnixStream`.
Refs: #3135.
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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.
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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>
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This adds the missing `net` feature flag in the generated API
documentation.
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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
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* 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`.
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Fixes: #3007
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This combines the `dns` and `net` feature flags. Previously, `dns` was
included as part of `net`. Given that is is rare that one would want
`dns` without `net`, DNS is now entirely gated w/ `net`.
The `parking_lot` feature is included as part of `full`.
Some misc docs are tweaked to reflect feature flag changes.
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This changes `ReadBuf::add_filled` to `ReadBuf::advance` and
`ReadBuf::append` to `ReadBuf::put_slice`. This is just a
mechanical change.
Closes #2769
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Switches various socket methods from &mut self to &self. This uses the intrusive
waker infrastructure to handle multiple waiters.
Refs: #2928
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Uses the infrastructure added by #2828 to enable switching
`TcpListener::accept` to use `&self`.
This also switches `poll_accept` to use `&self`. While doing introduces
a hazard, `poll_*` style functions are considered low-level. Most users
will use the `async fn` variants which are more misuse-resistant.
TcpListener::incoming() is temporarily removed as it has the same
problem as `TcpSocket::by_ref()` and will be implemented later.
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This enables the caller to configure the socket and to explicitly bind
the socket before converting it to a `TcpStream` or `TcpListener`.
Closes: #2902
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This also makes Mio an implementation detail, removing it from the
public API.
This is based on #1767.
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Closes #2891
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These functions have object safety issues. It also has been decided to
avoid vectored operations on the I/O traits. A later PR will bring back
vectored operations on specific types that support them.
Refs: #2879, #2716
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As we go into 0.3 we no longer need to support older versions of Rust where
IoSlice did not implement Copy and Clone, so we can more easily initialize the
IoSlice array in net::tcp::stream.
Co-authored-by: Bryan Donlan <bdonlan@amazon.com>
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This refactors I/O registration in a few ways:
- Cleans up the cached readiness in `PollEvented`. This cache used to
be helpful when readiness was a linked list of `*mut Node`s in
`Registration`. Previous refactors have turned `Registration` into just
an `AtomicUsize` holding the current readiness, so the cache is just
extra work and complexity. Gone.
- Polling the `Registration` for readiness now gives a `ReadyEvent`,
which includes the driver tick. This event must be passed back into
`clear_readiness`, so that the readiness is only cleared from `Registration`
if the tick hasn't changed. Previously, it was possible to clear the
readiness even though another thread had *just* polled the driver and
found the socket ready again.
- Registration now also contains an `async fn readiness`, which stores
wakers in an instrusive linked list. This allows an unbounded number
of tasks to register for readiness (previously, only 1 per direction (read
and write)). By using the intrusive linked list, there is no concern of
leaking the storage of the wakers, since they are stored inside the `async fn`
and released when the future is dropped.
- Registration retains a `poll_readiness(Direction)` method, to support
`AsyncRead` and `AsyncWrite`. They aren't able to use `async fn`s, and
so there are 2 reserved slots for those methods.
- IO types where it makes sense to have multiple tasks waiting on them
now take advantage of this new `async fn readiness`, such as `UdpSocket`
and `UnixDatagram`.
Additionally, this makes the `io-driver` "feature" internal-only (no longer
documented, not part of public API), and adds a second internal-only
feature, `io-readiness`, to group together linked list part of registration
that is only used by some of the IO types.
After a bit of discussion, changing stream-based transports (like
`TcpStream`) to have `async fn read(&self)` is punted, since that
is likely too easy of a footgun to activate.
Refs: #2779, #2728
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Co-authored-by: Eliza Weisman <eliza@buoyant.io>
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Works towards #2716. Changes the argument to `AsyncRead::poll_read` to
take a `ReadBuf` struct that safely manages writes to uninitialized memory.
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The documentation build failed with errors such as
error: `[read]` public documentation for `take` links to a private item
--> tokio/src/io/util/async_read_ext.rs:1078:9
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1078 | / /// Creates an adaptor which reads at most `limit` bytes from it.
1079 | | ///
1080 | | /// This function returns a new instance of `AsyncRead` which will read
1081 | | /// at most `limit` bytes, after which it will always return EOF
... |
1103 | | /// }
1104 | | /// ```
| |_______________^
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note: the lint level is defined here
--> tokio/src/lib.rs:13:9
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13 | #![deny(intra_doc_link_resolution_failure)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: the link appears in this line:
bytes read and future calls to [`read()`][read] may succeed.
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Previously, dropping the Write handle would issue a `shutdown(Both)`. However,
shutting down the read half is not portable and not the correct action to take.
This changes the behavior of OwnedWriteHalf to only perform a `shutdown(Write)`
on drop.
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This took me a bit to catch on to because I didn't really think there was any reason to investigate the individual documentation of each half. As someone dealing with TCP streams directly for first time (without previous experience from other languages) this caught me by surprise
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Refs: #2307
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Included changes
- all simple references like `<type>.<name>.html` for these types
- enum
- fn
- struct
- trait
- type
- simple references for methods, like struct.DelayQueue.html#method.poll
Refs: #1473
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The streams documentation referred to module-level 'split' doc which is no longer there
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* Update listener docs
* re-wrap text and add links
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The Incoming types currently don't take ownership of the listener, but
in most cases, users who want to use the Listener as a stream will only
want to use the stream from that point on. So, implement Stream directly
on the Listener types.
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The `&mut self` requirements for `TcpStream` methods ensure that there are at
most two tasks using the stream--one for reading and one for writing.
`TcpStream::split` allows two separate tasks to hold a reference to a single
`TcpStream`. `TcpStream::{peek,poll_peek}` only poll for read readiness, and
therefore are safe to use with a `ReadHalf`.
Instead of duplicating `TcpStream::poll_peek`, a private method is now used by
both `poll_peek` methods that uses the fact that only a `&TcpStream` is
required.
Closes #2136
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Document that conversion from `std` types must be done from within
the Tokio runtime context.
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`cargo fmt` has a bug where it does not format modules scoped with
feature flags.
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Introduces `StreamExt` trait. This trait will be used to add utility functions
to make working with streams easier. This patch includes two functions:
* `next`: a future returning the item in the stream.
* `map`: transform each item in the stream.
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