f94d671bfa
This commit revisits the `cast` module in libcore and libstd, and scrutinizes
all functions inside of it. The result was to remove the `cast` module entirely,
folding all functionality into the `mem` module. Specifically, this is the fate
of each function in the `cast` module.
* transmute - This function was moved to `mem`, but it is now marked as
#[unstable]. This is due to planned changes to the `transmute`
function and how it can be invoked (see the #[unstable] comment).
For more information, see RFC 5 and #12898
* transmute_copy - This function was moved to `mem`, with clarification that is
is not an error to invoke it with T/U that are different
sizes, but rather that it is strongly discouraged. This
function is now #[stable]
* forget - This function was moved to `mem` and marked #[stable]
* bump_box_refcount - This function was removed due to the deprecation of
managed boxes as well as its questionable utility.
* transmute_mut - This function was previously deprecated, and removed as part
of this commit.
* transmute_mut_unsafe - This function doesn't serve much of a purpose when it
can be achieved with an `as` in safe code, so it was
removed.
* transmute_lifetime - This function was removed because it is likely a strong
indication that code is incorrect in the first place.
* transmute_mut_lifetime - This function was removed for the same reasons as
`transmute_lifetime`
* copy_lifetime - This function was moved to `mem`, but it is marked
`#[unstable]` now due to the likelihood of being removed in
the future if it is found to not be very useful.
* copy_mut_lifetime - This function was also moved to `mem`, but had the same
treatment as `copy_lifetime`.
* copy_lifetime_vec - This function was removed because it is not used today,
and its existence is not necessary with DST
(copy_lifetime will suffice).
In summary, the cast module was stripped down to these functions, and then the
functions were moved to the `mem` module.
transmute - #[unstable]
transmute_copy - #[stable]
forget - #[stable]
copy_lifetime - #[unstable]
copy_mut_lifetime - #[unstable]
[breaking-change]
75 lines
2.1 KiB
Rust
75 lines
2.1 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Implementation of running at_exit routines
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//!
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//! Documentation can be found on the `rt::at_exit` function.
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use iter::Iterator;
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use kinds::Send;
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use mem;
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use option::{Some, None};
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use owned::Box;
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use ptr::RawPtr;
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use slice::OwnedVector;
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use unstable::sync::Exclusive;
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use vec::Vec;
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type Queue = Exclusive<Vec<proc():Send>>;
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// You'll note that these variables are *not* atomic, and this is done on
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// purpose. This module is designed to have init() called *once* in a
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// single-task context, and then run() is called only once in another
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// single-task context. As a result of this, only the `push` function is
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// thread-safe, and it assumes that the `init` function has run previously.
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static mut QUEUE: *mut Queue = 0 as *mut Queue;
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static mut RUNNING: bool = false;
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pub fn init() {
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unsafe {
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rtassert!(!RUNNING);
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rtassert!(QUEUE.is_null());
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let state: Box<Queue> = box Exclusive::new(vec!());
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QUEUE = mem::transmute(state);
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}
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}
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pub fn push(f: proc():Send) {
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unsafe {
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rtassert!(!RUNNING);
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rtassert!(!QUEUE.is_null());
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let state: &mut Queue = mem::transmute(QUEUE);
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let mut f = Some(f);
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state.with(|arr| {
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arr.push(f.take_unwrap());
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});
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}
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}
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pub fn run() {
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let vec = unsafe {
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rtassert!(!RUNNING);
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rtassert!(!QUEUE.is_null());
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RUNNING = true;
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let state: Box<Queue> = mem::transmute(QUEUE);
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QUEUE = 0 as *mut Queue;
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let mut vec = None;
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state.with(|arr| {
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vec = Some(mem::replace(arr, vec!()));
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});
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vec.take_unwrap()
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};
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for f in vec.move_iter() {
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f();
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}
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}
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