51 lines
1.2 KiB
Rust
51 lines
1.2 KiB
Rust
// Copyright 2018 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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use boxed::Box;
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use ptr;
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pub type Key = usize;
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struct Allocated {
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value: *mut u8,
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dtor: Option<unsafe extern fn(*mut u8)>,
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}
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#[inline]
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pub unsafe fn create(dtor: Option<unsafe extern fn(*mut u8)>) -> Key {
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Box::into_raw(Box::new(Allocated {
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value: ptr::null_mut(),
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dtor,
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})) as usize
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}
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#[inline]
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pub unsafe fn set(key: Key, value: *mut u8) {
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(*(key as *mut Allocated)).value = value;
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}
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#[inline]
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pub unsafe fn get(key: Key) -> *mut u8 {
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(*(key as *mut Allocated)).value
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}
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#[inline]
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pub unsafe fn destroy(key: Key) {
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let key = Box::from_raw(key as *mut Allocated);
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if let Some(f) = key.dtor {
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f(key.value);
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}
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}
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#[inline]
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pub fn requires_synchronized_create() -> bool {
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false
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}
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