rand.rs.html -- source

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map

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mime

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openssl

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osproto

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percent_encoding

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proc_macro2

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proc_macro_nested

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regex

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connect.rs error.rs into_url.rs lib.rs proxy.rs redirect.rs tls.rs util.rs

rustc_serialize

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ryu

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serde

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private

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ser

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bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

serde_json

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serde_urlencoded

ser

key.rs mod.rs pair.rs part.rs value.rs

serde_yaml

value

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slab

socket2

sys

lib.rs sockaddr.rs socket.rs utils.rs

syn

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cached.rs lib.rs thread_id.rs unreachable.rs

time

display.rs duration.rs lib.rs parse.rs sys.rs

tinyvec

array.rs arrayvec.rs lib.rs tinyvec.rs

tokio

future

maybe_done.rs mod.rs poll_fn.rs ready.rs try_join.rs

io

loom

std

atomic_ptr.rs atomic_u16.rs atomic_u32.rs atomic_u64.rs atomic_u8.rs atomic_usize.rs mod.rs unsafe_cell.rs

macros

cfg.rs join.rs loom.rs mod.rs pin.rs ready.rs scoped_tls.rs select.rs support.rs thread_local.rs try_join.rs

net

tcp

incoming.rs listener.rs mod.rs split.rs split_owned.rs stream.rs

park

either.rs mod.rs thread.rs

runtime

stream

all.rs any.rs chain.rs collect.rs empty.rs filter.rs filter_map.rs fold.rs fuse.rs iter.rs map.rs merge.rs mod.rs next.rs once.rs pending.rs skip.rs skip_while.rs stream_map.rs take.rs take_while.rs timeout.rs try_next.rs

sync

task

blocking.rs mod.rs spawn.rs yield_now.rs

time

driver

atomic_stack.rs entry.rs handle.rs mod.rs registration.rs stack.rs

wheel

level.rs mod.rs stack.rs

clock.rs delay.rs delay_queue.rs error.rs instant.rs interval.rs mod.rs throttle.rs timeout.rs

util

slab

addr.rs entry.rs generation.rs mod.rs page.rs shard.rs slot.rs stack.rs

bit.rs intrusive_double_linked_list.rs linked_list.rs mod.rs rand.rs trace.rs wake.rs

coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_tls

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codec

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tower_service

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tracing_core

callsite.rs dispatcher.rs event.rs field.rs lib.rs metadata.rs parent.rs span.rs stdlib.rs subscriber.rs

tracing_futures

executor

lib.rs stdlib.rs

try_lock

unicase

unicode

ascii.rs lib.rs

unicode_bidi

char_data

mod.rs tables.rs

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unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs no_std_prelude.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

host.rs lib.rs origin.rs parser.rs path_segments.rs quirks.rs slicing.rs

waiter

want

yaml_rust

emitter.rs lib.rs parser.rs scanner.rs yaml.rs

use std::cell::Cell;

/// Fast random number generate
///
/// Implement xorshift64+: 2 32-bit xorshift sequences added together.
/// Shift triplet [17,7,16] was calculated as indicated in Marsaglia's
/// Xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf
/// This generator passes the SmallCrush suite, part of TestU01 framework:
/// http://simul.iro.umontreal.ca/testu01/tu01.html
#[derive(Debug)]
pub(crate) struct FastRand {
    one: Cell<u32>,
    two: Cell<u32>,
}

impl FastRand {
    /// Initialize a new, thread-local, fast random number generator.
    pub(crate) fn new(seed: u64) -> FastRand {
        let one = (seed >> 32) as u32;
        let mut two = seed as u32;

        if two == 0 {
            // This value cannot be zero
            two = 1;
        }

        FastRand {
            one: Cell::new(one),
            two: Cell::new(two),
        }
    }

    pub(crate) fn fastrand_n(&self, n: u32) -> u32 {
        // This is similar to fastrand() % n, but faster.
        // See https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
        let mul = (self.fastrand() as u64).wrapping_mul(n as u64);
        (mul >> 32) as u32
    }

    fn fastrand(&self) -> u32 {
        let mut s1 = self.one.get();
        let s0 = self.two.get();

        s1 ^= s1 << 17;
        s1 = s1 ^ s0 ^ s1 >> 7 ^ s0 >> 16;

        self.one.set(s0);
        self.two.set(s1);

        s0.wrapping_add(s1)
    }
}

// Used by the select macro and `StreamMap`
#[cfg(any(feature = "macros", feature = "stream"))]
#[doc(hidden)]
#[cfg_attr(not(feature = "macros"), allow(unreachable_pub))]
pub fn thread_rng_n(n: u32) -> u32 {
    thread_local! {
        static THREAD_RNG: FastRand = FastRand::new(crate::loom::rand::seed());
    }

    THREAD_RNG.with(|rng| rng.fastrand_n(n))
}

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