This commit modifies rustdoc to not require these empty modules to be public in
the standard library. The modules still remain as a location to attach
documentation to, but the modules themselves are now private (don't have to
commit to an API). The documentation for the standard library now shows all of
the primitive types on the main index page.
This removes the type SetAlgebraItems and replaces it with the
structs Intersection and Difference.
Rename the existing HashSet iterators according to RFC #344:
* SetItems -> Iter
* SetMoveItems -> IntoIter
* Remaining set combination iterators renamed to Union and SymmetricDifference
First attempt to contribute to rust (and using github). This commit adds a few examples to std::io::TempDir. The examples seem to look okay (in my browser) and make check also passes.
It is useful to move all the elements out of a hashmap without deallocating
the underlying buffer. It came up in IRC, and this patch implements it as
`drain`.
r? @Gankro
cc: @frankmcsherry
The `is_power_of_two()` method of the `UnsignedInt` trait currently returns `true` for `self == 0`. Zero is not a power of two, assuming an integral exponent `k >= 0`. I've therefore moved this functionality to the new method `is_power_of_two_or_zero()` and reformed `is_power_of_two()` to return false for `self == 0`.
To illustrate the usefulness of the existence of both functions, consider `HashMap`. Its capacity must be zero or a power of two; conversely, it also requires a (non-zero) power of two for key and val alignment.
Also, added a small amount of documentation regarding #18604.
This removes the type SetAlgebraItems and replaces it with the
structs Intersection and Difference.
Rename the existing HashSet iterators according to RFC #344:
* SetItems -> Iter
* SetMoveItems -> IntoIter
* Remaining set combination iterators renamed to Union and SymmetricDifference
[breaking-change]
This PR substantially narrows the notion of a "runtime" in Rust, and allows calling into Rust code directly without any setup or teardown.
After this PR, the basic "runtime support" in Rust will consist of:
* Unwinding and backtrace support
* Stack guards
Other support, such as helper threads for timers or the notion of a "current thread" are initialized automatically upon first use.
When using Rust in an embedded context, it should now be possible to call a Rust function directly as a C function with absolutely no setup, though in that case panics will cause the process to abort. In this regard, the C/Rust interface will look much like the C/C++ interface.
In more detail, this PR:
* Merges `librustrt` back into `std::rt`, undoing the facade. While doing so, it removes a substantial amount of redundant functionality (such as mutexes defined in the `rt` module). Code using `librustrt` can now call into `std::rt` to e.g. start executing Rust code with unwinding support.
* Allows all runtime data to be initialized lazily, including the "current thread", the "at_exit" infrastructure, and the "args" storage.
* Deprecates and largely removes `std::task` along with the widespread requirement that there be a "current task" for many APIs in `std`. The entire task infrastructure is replaced with `std::thread`, which provides a more standard API for manipulating and creating native OS threads. In particular, it's possible to join on a created thread, and to get a handle to the currently-running thread. In addition, threads are equipped with some basic blocking support in the form of `park`/`unpark` operations (following a tradition in some OSes as well as the JVM). See the `std::thread` documentation for more details.
* Channels are refactored to use a new internal blocking infrastructure that itself sits on top of `park`/`unpark`.
One important change here is that a Rust program ends when its main thread does, following most threading models. On the other hand, threads will often be created with an RAII-style join handle that will re-institute blocking semantics naturally (and with finer control).
This is very much a:
[breaking-change]
Closes#18000
r? @alexcrichton
The [final step](https://github.com/rust-lang/rust/pull/19654) of
runtime removal changes the threading/process model so that the process
shuts down when the main thread exits. But several shared resources,
like the helper thread for timeouts, are shut down when the main thread
exits (but before the process ends), and they are not prepared to be
used after shut down, but other threads may try to access them during
the shutdown sequence of the main thread.
As an interim solution, the `at_exit` cleanup routine is simply skipped.
Ultimately, these resources should be made to safely handle asynchronous
shutdown, usually by panicking if called from a detached thread when the
main thread is ending.
See issue for details https://github.com/rust-lang/rust/issues/20012
This is a [breaking-change] for anyone relying on `at_exit`.
This flag is somewhat tied to the `unwind` module rather than the `thread_info`
module, so this commit moves it into that module as well as allowing the same OS
thread to call `unwind::try` multiple times. Previously once a thread panicked
its panic flag was never reset, even after exiting the panic handler.
The current implementations use `std::sync` primitives, but these primitives
currently end up relying on `thread_info` and a local `Thread` being available
(mainly for checking the panicking flag).
To get around this, this commit lowers the abstractions used by the windows
thread_local implementation as well as the at_exit_imp module. Both of these
modules now use a `sys::Mutex` and a `static mut` and manage the
allocation/locking manually.
This commit is part of a series that introduces a `std::thread` API to
replace `std::task`.
In the new API, `spawn` returns a `JoinGuard`, which by default will
join the spawned thread when dropped. It can also be used to join
explicitly at any time, returning the thread's result. Alternatively,
the spawned thread can be explicitly detached (so no join takes place).
As part of this change, Rust processes now terminate when the main
thread exits, even if other detached threads are still running, moving
Rust closer to standard threading models. This new behavior may break code
that was relying on the previously implicit join-all.
In addition to the above, the new thread API also offers some built-in
support for building blocking abstractions in user space; see the module
doc for details.
Closes#18000
[breaking-change]
We need to be sure to init thread_info before we init args for example because
args is grabbing locks which may entail looking at the local thread eventually.
This commit removes the runtime bookkeeping previously used to ensure
that all Rust tasks were joined before the runtime was shut down.
This functionality will be replaced by an RAII style `Thread` API, that
will also offer a detached mode.
Since this changes the semantics of shutdown, it is a:
[breaking-change]
This commit merges the `rustrt` crate into `std`, undoing part of the
facade. This merger continues the paring down of the runtime system.
Code relying on the public API of `rustrt` will break; some of this API
is now available through `std::rt`, but is likely to change and/or be
removed very soon.
[breaking-change]
- The following operator traits now take their argument by value: `Neg`, `Not`. This breaks all existing implementations of these traits.
- The unary operation `OP a` now "desugars" to `OpTrait::op_method(a)` and consumes its argument.
[breaking-change]
---
r? @nikomatsakis This PR is very similar to the binops-by-value PR
cc @aturon
It is useful to move all the elements out of some collections without
deallocating the underlying buffer. It came up in IRC, and this patch
implements it as `drain`. This has been discussed as part of RFC 509.
r? @Gankro
cc: @frankmcsherry
This commit modifies rustdoc to not require these empty modules to be public in
the standard library. The modules still remain as a location to attach
documentation to, but the modules themselves are now private (don't have to
commit to an API). The documentation for the standard library now shows all of
the primitive types on the main index page.
followed by a semicolon.
This allows code like `vec![1i, 2, 3].len();` to work.
This breaks code that uses macros as statements without putting
semicolons after them, such as:
fn main() {
...
assert!(a == b)
assert!(c == d)
println(...);
}
It also breaks code that uses macros as items without semicolons:
local_data_key!(foo)
fn main() {
println("hello world")
}
Add semicolons to fix this code. Those two examples can be fixed as
follows:
fn main() {
...
assert!(a == b);
assert!(c == d);
println(...);
}
local_data_key!(foo);
fn main() {
println("hello world")
}
RFC #378.
Closes#18635.
[breaking-change]
---
Rebased version of #18958
r? @alexcrichton
cc @pcwalton
followed by a semicolon.
This allows code like `vec![1i, 2, 3].len();` to work.
This breaks code that uses macros as statements without putting
semicolons after them, such as:
fn main() {
...
assert!(a == b)
assert!(c == d)
println(...);
}
It also breaks code that uses macros as items without semicolons:
local_data_key!(foo)
fn main() {
println("hello world")
}
Add semicolons to fix this code. Those two examples can be fixed as
follows:
fn main() {
...
assert!(a == b);
assert!(c == d);
println(...);
}
local_data_key!(foo);
fn main() {
println("hello world")
}
RFC #378.
Closes#18635.
[breaking-change]
