dope-net 0.15.0

The manifold runtime
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

use std::{marker, mem};

use dope_core::{
    driver::{
        self, flight, ops, retained,
        route::{self, table, table::entries::vacant},
    },
    io::{
        fd::handles,
        socket::{self, establishment, option},
    },
};
use o3::collections::{self, queue::fixed};

use crate::link::pool;

pub(crate) struct Receive<'a, 'd, Tag: route::Tag> {
    fd: &'a handles::Descriptor<'d>,
    target: route::Target<'d, Tag>,
}

impl<'a, 'd, Tag: route::Tag> Receive<'a, 'd, Tag> {
    pub(crate) fn new(fd: &'a handles::Descriptor<'d>, target: route::Target<'d, Tag>) -> Self {
        Self { fd, target }
    }

    pub(crate) fn submit(
        self,
        flights: &flight::Slots<'d, Tag>,
        driver: &mut driver::Context<'_, 'd>,
    ) -> Result<flight::Flight<'d>, driver::SubmitError> {
        let Self { fd, target } = self;
        ops::Submit::submit_recv(driver, flights, fd, target)
    }
}

pub(crate) struct Connect<'a, 'd, const ID: u8> {
    fd: handles::Descriptor<'d>,
    addr: &'a socket::Addr,
    target: route::Target<'d, route::KeyTag<ID>>,
}

impl<'a, 'd, const ID: u8> Connect<'a, 'd, ID> {
    pub(crate) fn new(
        fd: handles::Descriptor<'d>,
        addr: &'a socket::Addr,
        target: route::Target<'d, route::KeyTag<ID>>,
    ) -> Self {
        Self { fd, addr, target }
    }

    pub(crate) fn submit<'owner>(
        self,
        flights: &flight::Slots<'d, route::KeyTag<ID>>,
        driver: &mut retained::Context<'_, 'owner, 'd>,
        options: option::StreamOptions,
    ) -> Result<establishment::ConnectionPending<'d>, handles::Descriptor<'d>>
    where
        'd: 'owner,
    {
        let Self { fd, addr, target } = self;
        // SAFETY: the targeted establishment state is created only after its
        // exact slab-indexed address is stored in Outbound's stable boxed
        // table. The installed owner retains that table through completion or
        // quiescence, and Connect owns the descriptor structurally.
        let connect = retained::raw::Connect::new(fd, addr, target);
        unsafe { retained::raw::Owner::submit_connect(driver, flights, options, connect) }
    }
}

#[derive(Clone, Copy)]
#[repr(transparent)]
struct RearmIndex(route::SlotIndex);

unsafe impl fixed::raw::Index for RearmIndex {
    fn index(self) -> u32 {
        self.0.raw()
    }
}

pub(crate) struct Rearm<'d, const ID: u8> {
    pending: fixed::Coalescing<route::Epoch, RearmIndex>,
    driver: marker::PhantomData<fn(&'d ()) -> &'d ()>,
}

const _: () = assert!(
    mem::size_of::<Rearm<'static, 0>>()
        == mem::size_of::<fixed::Fifo<RearmIndex>>()
            + mem::size_of::<Box<[Option<route::Epoch>]>>()
);
const _: () = assert!(mem::size_of::<RearmIndex>() == mem::size_of::<u32>());
const _: () = assert!(mem::align_of::<RearmIndex>() == mem::align_of::<u32>());
impl<'d, const ID: u8> Rearm<'d, ID> {
    pub(crate) fn try_with_capacity(
        capacity: table::Capacity,
    ) -> Result<Self, collections::AllocationError> {
        Ok(Self {
            pending: fixed::Coalescing::try_with_index_capacity(capacity.raw())?,
            driver: marker::PhantomData,
        })
    }

    pub(in crate::link) fn key<T>(
        &self,
        keys: pool::Keyspace<'d, ID>,
        reservation: &vacant::Entry<'_, T, route::KeyTag<ID>>,
    ) -> pool::Key<'d, ID> {
        keys.bind_table(reservation.key())
    }

    pub(in crate::link) fn queue(&mut self, key: pool::Key<'d, ID>) {
        // SAFETY: Pool creates tokens only from its paired slab reservations.
        unsafe {
            fixed::raw::Coalescing::schedule_unchecked(
                &mut self.pending,
                RearmIndex(key.lane()),
                key.epoch(),
            )
        };
    }

    pub(in crate::link) fn pop_front(
        &mut self,
        keys: pool::Keyspace<'d, ID>,
    ) -> Option<pool::Key<'d, ID>> {
        let (index, epoch) = self.pending.pop_front()?;
        Some(keys.bind_parts(index.0, epoch))
    }

    pub(in crate::link) fn len(&self) -> usize {
        self.pending.len()
    }

    pub(in crate::link) fn is_empty(&self) -> bool {
        self.pending.is_empty()
    }
}