As the [epoll documentation points out](https://man7.org/linux/man-pages/man7/epoll.7.html), a read that only partially fills a buffer is sufficient to show that the socket buffer has been drained.
We can take advantage of this by clearing readiness in this case, which seems to significantly improve performance under certain conditions.
Co-authored-by: Carl Lerche <[email protected]>
The documentation for the runtime `Builder::worker_threads` function
incorrectly stated that it would panic if used when constructing a
`current_thread` runtime. In truth, the call to the function has no
effect.
Since adding the described panic to the code could cause new panics in
existing code using tokio, the documentation has been modified to
describe the existing behavior.
Refs: #4773
This change adds a case that was missing from the original PR, #4793.
The `io::driver::Handle::current` function was only covered by
`#[track_caller]` in the case that the `rt` feature is enabled, however
it was missing in the case that the `rt` feture isn't enabled (in which
case a panic would be more common).
This particular case cannot be tested in the tokio tests as they always
run with all features enabled.
Refs: #4413
Functions that may panic can be annotated with `#[track_caller]` so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds `#[track_caller]` to all the public APIs in the task
module of the tokio crate where the documentation describes how the
function may panic due to incorrect context or inputs.
In cases where `#[track_caller]` does not work, it has been left out.
For example, it currently does not work on async functions, blocks, or
closures. So any call stack that passes through one of these before
reaching the actual panic is not able to show the calling site outside
of tokio as the panic location.
The following functions have call stacks that pass through closures:
* `task::block_in_place`
* `task::local::spawn_local`
Tests are included to cover each potentially panicking function.
The following functions already had `#[track_caller]` applied everywhere
it was needed and only tests have been added:
* `task::spawn`
* `task::LocalKey::sync_scope`
Refs: #4413
Functions that may panic can be annotated with #[track_caller] so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds #[track_caller] to all the non-unstable public net APIs
in the main tokio crate where the documentation describes how the
function may panic due to incorrect context or inputs. Not all panic
cases can have #[track_caller] applied fully as the callstack passes
through a closure which isn't yet supported by the annotation (e.g. net
functions called from outside a tokio runtime).
Additionally, the documentation was updated to indicate additional cases
in which the public net functions may panic (the same as the io
functions).
Tests are included to cover each potentially panicking function.
Refs: #4413
This adds initial, unstable, support for the wasm32-wasi target. Not all of Tokio's
features are supported yet as WASI's non-blocking APIs are still limited.
Refs: tokio-rs/tokio#4827
Currently, we only have WASM regression tests that run without WASI.
However, rust provides a WASI specific target which enables code to
special case WASI. This PR adds a basic test to cover that case.
This is an initial addition to help land tokio-rs/tokio#4716.
Functions that may panic can be annotated with `#[track_caller]` so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds `#[track_caller]` to all the public APIs in the sync
module of the tokio crate where the documentation describes how the
function may panic due to incorrect context or inputs.
In cases where `#[track_caller]` does not work, it has been left out.
For example, it currently does not work on async functions, blocks, or
closures. So any call stack that passes through one of these before
reaching the actual panic is not able to show the calling site outside
of tokio as the panic location.
The following functions have call stacks that pass through closures:
* `sync::watch::Sender::send_modify`
* `sync::watch::Sender::send_if_modified`
Additionally, in the above functions it is a panic inside the supplied
closure which causes the function to panic, and so showing the location
of the panic itself is desirable.
The following functions are async:
* `sync::mpsc::bounded::Sender::send_timeout`
Tests are included to cover each potentially panicking function.
Refs: #4413
Functions that may panic can be annotated with #[track_caller] so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds #[track_caller] to the signal() function which is the
only function in the signal public API which can panic. Documentation
was added to this function to indicate that it may panic.
Not all panic cases can have #[track_caller] applied fully as the
callstack passes through a closure which isn't yet supported by the
annotation (e.g. signal() called from outside a tokio runtime).
Tests are included to cover the case where signal() is called from a
runtime without IO enabled.
Refs: #4413
This fixes#4801, where, as a result of https://github.com/rust-lang/rust/pull/95469, our implementation of cat used for this test no longer works, as stdio functions on windows now can abort the process if the pipe is set to nonblocking mode.
Unfortunately in windows, setting one end of the pipe to be nonblocking makes the whole thing nonblocking, so when, in tokio::process we set the child pipes to nonblocking mode, it causes serious problems for any rust program at the other end.
Fixing this issue is for another day, but fixing the tests is for today.
Functions that may panic can be annotated with #[track_caller] so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds #[track_caller] to all the non-unstable public io APIs
in the main tokio crate where the documentation describes how the
function may panic due to incorrect context or inputs.
Additionally, the documentation for `AsyncFd` was updated to indicate
that the functions `new` and `with_intent` can panic.
Tests are included to cover each potentially panicking function. The
logic to test the location of a panic (which is a little complex), has
been moved to a test support module.
Refs: #4413
Functions that may panic can be annotated with #[track_caller] so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds #[track_caller] to all the non-unstable public APIs in
tokio-util where the documentation describes how the function may panic
due to incorrect context or inputs.
In cases where `#[track_caller]` does not work, it has been left out. For
example, it currently does not work on async functions, blocks, or
closures. So any call stack that passes through one of these before
reaching the actual panic is not able to show the calling site outside
of tokio as the panic location.
The public functions that could not have `#[track_caller]` added for
this reason are:
* `time::advance`
Tests are included to cover each potentially panicking function. In the
following cases, `#[track_caller]` had already been added, and only
tests have been added:
* `time::interval`
* `time::interval_at`
Refs: #4413
* util: add track_caller to public APIs
Functions that may panic can be annotated with `#[track_caller]` so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds `#[track_caller]` to all the non-unstable public APIs in
tokio-util where the documentation describes how the function may panic
due to incorrect context or inputs.
In one place, an assert was added where the described behavior appeared
not to be implemented. The documentation for `DelayQueue::reserve`
states that the function will panic if the new capacity exceeds the
maximum number of entries the queue can contain. However, the function
didn't panic until a higher number caused by an allocation failure. This
is inconsistent with `DelayQueue::insert_at` which will panic if the
number of entries were to go over MAX_ENTRIES.
Tests are included to cover each potentially panicking function.
Refs: #4413
* fix tests on FreeBSD 32-bit (I hope)
Some tests were failing on FreeBSD 32-bit because the "times too far in
the future" for DelayQueue were also too far in the future for the OS.
Fixed by copying the MAX_DURATION value from where it's defined and
using it to create a duration that is just 1 more than the maximum. This
will start to break once we get close (within 2 and a bit years) of the
Epochalypse (19 Jan, 2038) - but a lot of other things are going to be
breaking on FreeBSD 32-bit by then anyway.
Functions that may panic can be annotated with `#[track_caller]` so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds `#[track_caller]` to all the non-unstable public APIs
in tokio-stream (only `chunks_timeout` in `StreamExt`) where the
documentation describes how this function may panic due to incorrect
input.
A test has been included to cover the panic.
Refs: #4413
Functions that may panic can be annotated with `#[track_caller]` so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds track caller to all the non-unstable public APIs in
Tokio core where the documentation describes how the function may panic
due to incorrect context or inputs. Since each internal function needs
to be annotated down to the actual panic, it makes sense to start in
Tokio core functionality.
Tests are needed to ensure that all the annotations remain in place in
case internal refactoring occurs.
The test installs a panic hook to extract the file location from the
`PanicInfo` struct and clone it up to the outer scope to check that the
panic was indeed reported from within the test file. The downside to
this approach is that the panic hook is global while set and so we need
a lot of extra functionality to effectively serialize the tests so that
only a single panic can occur at a time.
The annotation of `block_on` was removed as it did not work. It appears
to be impossible to correctly chain track caller when the call stack to
the panic passes through clojures, as the track caller annotation can
only be applied to functions. Also, the panic message itself is very
descriptive.
Allows the user to configure the runtime's behavior when a spawned task
panics. Currently, the panic is propagated to the JoinHandle and the
runtime resumes. This patch lets the user set the runtime to shutdown on
unhandled panic.
So far, this is only implemented for the current-thread runtime.
Refs: #4516
Extracts the refactor from #4518.
The basic scheduler takes many configuration options as arguments to the
constructor. This cleans it up a bit by defining a `Config` struct and
using that to pass arguments to the constructor.
Alice Ryhl