35 lines
1.0 KiB
Rust
35 lines
1.0 KiB
Rust
// This file is part of libfringe, a low-level green threading library.
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// Copyright (c) whitequark <whitequark@whitequark.org>
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// See the LICENSE file included in this distribution.
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extern crate alloc;
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use self::alloc::raw_vec::RawVec;
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use self::alloc::boxed::Box;
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/// OwnedStack allocates on heap and owns a non-guarded stack.
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#[derive(Debug)]
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pub struct OwnedStack(Box<[u8]>);
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impl OwnedStack {
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/// Allocates a new stack with exactly `size` accessible bytes using
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/// the default Rust allocator.
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pub fn new(size: usize) -> OwnedStack {
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OwnedStack(unsafe { RawVec::with_capacity(size).into_box() })
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}
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}
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impl ::stack::Stack for OwnedStack {
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#[inline(always)]
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fn base(&self) -> *mut u8 {
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// The slice cannot wrap around the address space, so the conversion from usize
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// to isize will not wrap either.
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let len: isize = self.0.len() as isize;
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unsafe { self.limit().offset(len) }
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}
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#[inline(always)]
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fn limit(&self) -> *mut u8 {
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self.0.as_ptr() as *mut u8
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}
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}
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