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
use std::cell::UnsafeCell;
use hibitset::{BitProducer, BitSetLike};
use rayon::iter::plumbing::{bridge_unindexed, Folder, UnindexedConsumer, UnindexedProducer};
use rayon::iter::ParallelIterator;
use join::Join;
pub unsafe trait ParJoin: Join {
fn par_join(self) -> JoinParIter<Self>
where
Self: Sized,
{
if <Self as Join>::is_unconstrained() {
println!("WARNING: `ParJoin` possibly iterating through all indices, you might've made a join with all `MaybeJoin`s, which is unbounded in length.");
}
JoinParIter(self)
}
}
#[must_use]
pub struct JoinParIter<J>(J);
impl<J> ParallelIterator for JoinParIter<J>
where
J: Join + Send,
J::Mask: Send + Sync,
J::Type: Send,
J::Value: Send,
{
type Item = J::Type;
fn drive_unindexed<C>(self, consumer: C) -> C::Result
where
C: UnindexedConsumer<Self::Item>,
{
let (keys, values) = unsafe { self.0.open() };
let producer = BitProducer((&keys).iter(), 3);
let values = UnsafeCell::new(values);
bridge_unindexed(JoinProducer::<J>::new(producer, &values), consumer)
}
}
struct JoinProducer<'a, J>
where
J: Join + Send,
J::Mask: Send + Sync + 'a,
J::Type: Send,
J::Value: Send + 'a,
{
keys: BitProducer<'a, J::Mask>,
values: &'a UnsafeCell<J::Value>,
}
impl<'a, J> JoinProducer<'a, J>
where
J: Join + Send,
J::Type: Send,
J::Value: 'a + Send,
J::Mask: 'a + Send + Sync,
{
fn new(keys: BitProducer<'a, J::Mask>, values: &'a UnsafeCell<J::Value>) -> Self {
JoinProducer { keys, values }
}
}
unsafe impl<'a, J> Send for JoinProducer<'a, J>
where
J: Join + Send,
J::Type: Send,
J::Value: 'a + Send,
J::Mask: 'a + Send + Sync,
{}
impl<'a, J> UnindexedProducer for JoinProducer<'a, J>
where
J: Join + Send,
J::Type: Send,
J::Value: 'a + Send,
J::Mask: 'a + Send + Sync,
{
type Item = J::Type;
fn split(self) -> (Self, Option<Self>) {
let (cur, other) = self.keys.split();
let values = self.values;
let first = JoinProducer::new(cur, values);
let second = other.map(|o| JoinProducer::new(o, values));
(first, second)
}
fn fold_with<F>(self, folder: F) -> F
where
F: Folder<Self::Item>,
{
let JoinProducer { values, keys, .. } = self;
let iter = keys.0.map(|idx| unsafe {
J::get(&mut *values.get(), idx)
});
folder.consume_iter(iter)
}
}