This commit contains an implementation of synchronous, bounded channels for
Rust. This is an implementation of the proposal made last January [1]. These
channels are built on mutexes, and currently focus on a working implementation
rather than speed. Receivers for sync channels have select() implemented for
them, but there is currently no implementation of select() for sync senders.
Rust will continue to provide both synchronous and asynchronous channels as part
of the standard distribution, there is no intent to remove asynchronous
channels. This flavor of channels is meant to provide an alternative to
asynchronous channels because like green tasks, asynchronous channels are not
appropriate for all situations.
[1] - https://mail.mozilla.org/pipermail/rust-dev/2014-January/007924.html
This commit contains an implementation of synchronous, bounded channels for
Rust. This is an implementation of the proposal made last January [1]. These
channels are built on mutexes, and currently focus on a working implementation
rather than speed. Receivers for sync channels have select() implemented for
them, but there is currently no implementation of select() for sync senders.
Rust will continue to provide both synchronous and asynchronous channels as part
of the standard distribution, there is no intent to remove asynchronous
channels. This flavor of channels is meant to provide an alternative to
asynchronous channels because like green tasks, asynchronous channels are not
appropriate for all situations.
[1] - https://mail.mozilla.org/pipermail/rust-dev/2014-January/007924.html
* Remove clone-ability from all primitives. All shared state will now come
from the usage of the primitives being shared, not the primitives being
inherently shareable. This allows for fewer allocations for stack-allocated
primitives.
* Add `Mutex<T>` and `RWLock<T>` which are stack-allocated primitives for purely
wrapping a piece of data
* Remove `RWArc<T>` in favor of `Arc<RWLock<T>>`
* Remove `MutexArc<T>` in favor of `Arc<Mutex<T>>`
* Shuffle around where things are located
* The `arc` module now only contains `Arc`
* A new `lock` module contains `Mutex`, `RWLock`, and `Barrier`
* A new `raw` module contains the primitive implementations of `Semaphore`,
`Mutex`, and `RWLock`
* The Deref/DerefMut trait was implemented where appropriate
* `CowArc` was removed, the functionality is now part of `Arc` and is tagged
with `#[experimental]`.
* The crate now has #[deny(missing_doc)]
* `Arc` now supports weak pointers
This is not a large-scale rewrite of the functionality contained within the
`sync` crate, but rather a shuffling of who does what an a thinner hierarchy of
ownership to allow for better composability.
This removes the now-outdated MutexArc and RWArc types. These are superseded by
Arc<Mutex<T>> and Arc<RWLock<T>>. The only remaining arc is the one true Arc.
Additionally, the arc now has weak pointers implemented for it to assist in
breaking cycles.
This commit brings the arc api up to parity with the sibling Rc api, making them
nearly interchangeable for inter and intra task communication.
The OSX bots have been deadlocking recently in the rustdoc tests. I have only
been able to rarely reproduce the deadlock on my local setup. When reproduced,
it looks like the child process is spinning on the malloc mutex, which I
presume is locked with no other threads to unlock it.
I'm not convinced that this is what's happening, because OSX should protect
against this with pthread_atfork by default. Regardless, running as little code
as possible in the child after fork() is normally a good idea anyway, so this
commit moves all allocation to the parent process to run before the child
executes.
After running 6k iterations of rustdoc tests, this deadlocked twice before, and
after 20k iterations afterwards, it never deadlocked. I draw the conclusion that
this is either sweeping the bug under the rug, or it did indeed fix the
underlying problem.
This doesn't work quite right yet (we need to build packages for all hosts)
and I'm not ready to turn on new dist artifacts yet, but I want to start doing
dry runs for 0.10, so I'm turning this off for now.
This is the final nail in the coffin for the crate map. The `start` function for
libgreen now has a new added parameter which is the event loop factory instead
of inferring it from the crate map. The two current valid values for this
parameter are `green::basic::event_loop` and `rustuv::event_loop`.
Summary:
It was possible to borrow unsafe static items in static initializers.
This patch implements a small `Visitor` that walks static initializer's
expressions and checks borrows aliasability.
Fixes#13005
Test Plan: make check
Differential Revision: http://phabricator.octayn.net/D2
While double-checking my understanding of the meaning of `'static`, I made the following test program:
```rust
fn foo<X:'static>(_x: X) { }
#[cfg(not(acceptable))]
fn bar() {
let a = 3;
let b = &a;
foo(b);
}
#[cfg(acceptable)]
fn bar() {
static c : int = 4;;
let d : &'static int = &c;
foo(d);
}
fn main() {
bar();
}
```
Transcript of compiling above program, illustrating that the `--cfg acceptable` variant of `bar` compiles successfully, showing that the`'static` kind bound only disallows non-`static` references, not *all* references:
```
% rustc --version
/Users/fklock/opt/rust-dbg/bin/rustc 0.10-pre (caf17fe 2014-03-21 02:21:50 -0700)
host: x86_64-apple-darwin
% rustc /tmp/s.rs
/tmp/s.rs:7:5: 7:8 error: instantiating a type parameter with an incompatible type `&int`, which does not fulfill `'static`
/tmp/s.rs:7 foo(b);
^~~
error: aborting due to previous error
% rustc --cfg acceptable /tmp/s.rs
% ./s
%
```
(Note that the explicit type annotation on `let d : &'static int` is necessary; it did not suffice for me to just write `let d = &'static c;`. That might be a latent bug, I am not sure yet.)
Anyway, a fix to the documentation seemed prudent.
syntax: allow `trace_macros!` and `log_syntax!` in item position.
Previously
trace_macros!(true)
fn main() {}
would complain about `trace_macros` being an expression macro in item
position. This is a pointless limitation, because the macro is purely
compile-time, with no runtime effect. (And similarly for log_syntax.)
This also changes the behaviour of `trace_macros!` very slightly, it
used to be equivalent to
macro_rules! trace_macros {
(true $($_x: tt)*) => { true };
(false $($_x: tt)*) => { false }
}
I.e. you could invoke it with arbitrary trailing arguments, which were
ignored. It is changed to accept only exactly `true` or `false` (with no
trailing arguments) and expands to `()`.
While double-checking my understanding of the meaning of `'static`,
I made the following test program:
```rust
fn foo<X:'static>(_x: X) { }
#[cfg(not(acceptable))]
fn bar() {
let a = 3;
let b = &a;
foo(b);
}
#[cfg(acceptable)]
fn bar() {
static c : int = 4;;
let d : &'static int = &c;
foo(d);
}
fn main() {
bar();
}
```
Transcript of compiling above program, illustrating that the `--cfg
acceptable` variant of `bar` compiles successfully, showing that the
`'static` kind bound only disallows non-`static` references, not *all*
references:
```
% rustc --version
/Users/fklock/opt/rust-dbg/bin/rustc 0.10-pre (caf17fe 2014-03-21 02:21:50 -0700)
host: x86_64-apple-darwin
% rustc /tmp/s.rs
/tmp/s.rs:7:5: 7:8 error: instantiating a type parameter with an incompatible type `&int`, which does not fulfill `'static`
/tmp/s.rs:7 foo(b);
^~~
error: aborting due to previous error
% rustc --cfg acceptable /tmp/s.rs
% ./s
%
```
(Note that the explicit type annotation on `let d : &'static int` is
necessary; it did not suffice for me to just write `let d = &'static
c;`. That might be a latent bug, I am not sure yet.)
Anyway, a fix to the documentation seemed prudent.
Rust doc sprint: adding doc strings to the Terminfo library.
This is my very first Rust repository PR, so please do not hold back any formatting, nit-picky commentary. I need it.
* Include tip given by Leo Testard in mailing list about labeled `break`
and `continue`:
https://mail.mozilla.org/pipermail/rust-dev/2014-March/009145.html
* cross-reference named lifetimes in tutorial -> lifetimes guide
* Broke named lifetimes section into two sub-sections.
* Added mention of `'static` lifetime.
This commit moves from {read,emit}_seq for tuples to {read,emit}_tuple, as well
as providing a generalized macro for generating these implementations from one
invocation.
Closes#13086
