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79 lines
1.6 KiB
79 lines
1.6 KiB
//! Traits and types used for mapping a R^W send-recv buffer `(tx, rx)`
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//!
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//! See `MappedFile::try_new_buffer()`
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use super::*;
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use std::{
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borrow::Borrow,
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ops,
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sync,
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rc,
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};
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pub trait TwoBufferProvider<T: ?Sized>
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{
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type ControlWrapper: Borrow<T>;
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fn as_wrapper(&self) -> &Self::ControlWrapper;
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#[inline(always)]
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fn inner(&self) -> &T
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{
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self.as_wrapper().borrow()
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}
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fn from_boxed(value: Box<T>) -> Box<Self>;
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//TODO: How do we give enough info to caller to create this?
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}
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/// For thread-sharable buffer holds
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#[derive(Debug, Clone)]
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pub struct Shared<T: ?Sized>(sync::Arc<T>);
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/// For non thread-sharable buffer holds
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#[derive(Debug, Clone)]
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pub struct Private<T: ?Sized>(rc::Rc<T>);
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impl<T: ?Sized> TwoBufferProvider<T> for Shared<T> {
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type ControlWrapper = sync::Arc<T>;
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#[inline(always)]
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fn as_wrapper(&self) -> &Self::ControlWrapper {
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&self.0
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}
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#[inline]
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fn from_boxed(value: Box<T>) ->Box<Self> {
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Box::new(Self(value.into()))
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}
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}
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impl<T: ?Sized + AsRawFd> AsRawFd for Shared<T>
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{
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#[inline(always)]
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fn as_raw_fd(&self) -> RawFd {
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self.as_wrapper().as_raw_fd()
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}
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}
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impl<T: ?Sized> TwoBufferProvider<T> for Private<T> {
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type ControlWrapper = rc::Rc<T>;
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#[inline(always)]
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fn as_wrapper(&self) -> &Self::ControlWrapper {
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&self.0
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}
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#[inline]
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fn from_boxed(value: Box<T>) ->Box<Self> {
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Box::new(Self(value.into()))
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}
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}
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impl<T: ?Sized + AsRawFd> AsRawFd for Private<T>
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{
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#[inline(always)]
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fn as_raw_fd(&self) -> RawFd {
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self.as_wrapper().as_raw_fd()
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}
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}
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