listener.rs.html -- source

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getrandom

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hex

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iter.rs lib.rs macros.rs

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client

mod.rs pool.rs proxy.rs request.rs response.rs

header

common

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internals

cell.rs item.rs mod.rs vec_map.rs

shared

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mod.rs parsing.rs

http

h1.rs message.rs mod.rs

server

listener.rs mod.rs request.rs response.rs

buffer.rs error.rs lib.rs method.rs net.rs status.rs uri.rs version.rs

idna

lib.rs punycode.rs uts46.rs

itoa

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linked_hash_map

log

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matches

matrixmultiply

x86

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memchr

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mime

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nalgebra

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linalg

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ndarray

ndarray_linalg

net2

sys

unix

impls.rs mod.rs

ext.rs lib.rs socket.rs tcp.rs udp.rs unix.rs utils.rs

netlib_src

nix

num_complex

cast.rs crand.rs lib.rs pow.rs

num_cpus

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num_rational

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ops

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bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs real.rs sign.rs

opaque_debug

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phf_shared

ppv_lite86

x86_64

lib.rs soft.rs types.rs

proc_macro2

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quick_error

quote

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rand

rand_chacha

chacha.rs guts.rs lib.rs

rand_core

block.rs error.rs impls.rs le.rs lib.rs os.rs

rand_distr

binomial.rs cauchy.rs dirichlet.rs exponential.rs gamma.rs lib.rs normal.rs pareto.rs pert.rs poisson.rs triangular.rs unit_ball.rs unit_circle.rs unit_disc.rs unit_sphere.rs utils.rs weibull.rs ziggurat_tables.rs

rawpointer

regex

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remove_dir_all

rosrust

rosrust_codegen

error.rs genmsg.rs helpers.rs lib.rs message_path.rs msg.rs output_layout.rs rosmsg_include.rs

rosrust_msg

rouille

rustc_demangle

legacy.rs lib.rs v0.rs

rustros_tf

lib.rs msg.rs transforms.rs

ryu

buffer

pretty

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safemem

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from_primitive.rs ignored_any.rs impls.rs mod.rs utf8.rs value.rs

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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_xml_rs

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sha1

siphasher

lib.rs sip.rs sip128.rs

smallvec

syn

tempdir

term

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parser

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mod.rs parm.rs searcher.rs

thread_local

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

threadpool

time

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

tiny_http

util

custom_stream.rs equal_reader.rs messages_queue.rs mod.rs refined_tcp_stream.rs sequential.rs task_pool.rs

client.rs common.rs lib.rs request.rs response.rs

traitobject

impls.rs lib.rs

twoway

bmh.rs lib.rs util.rs

typeable

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ucd_util

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hangul.rs ideograph.rs lib.rs name.rs property.rs

unicase

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deprecated.rs explicit.rs format_chars.rs implicit.rs level.rs lib.rs prepare.rs

unicode_normalization

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

unicode_xid

lib.rs tables.rs

url

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char_utf8.rs lib.rs

void

xml

xml_rpc

xmlfmt

de.rs error.rs mod.rs parse.rs ser.rs value.rs

client.rs error.rs lib.rs server.rs

yaml_rust

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

use std::sync::{Arc, mpsc};
use std::thread;

use net::NetworkListener;

pub struct ListenerPool<A: NetworkListener> {
    acceptor: A
}

impl<A: NetworkListener + Send + 'static> ListenerPool<A> {
    /// Create a thread pool to manage the acceptor.
    pub fn new(acceptor: A) -> ListenerPool<A> {
        ListenerPool { acceptor: acceptor }
    }

    /// Runs the acceptor pool. Blocks until the acceptors are closed.
    ///
    /// ## Panics
    ///
    /// Panics if threads == 0.
    pub fn accept<F>(self, work: F, threads: usize)
        where F: Fn(A::Stream) + Send + Sync + 'static {
        assert!(threads != 0, "Can't accept on 0 threads.");

        let (super_tx, supervisor_rx) = mpsc::channel();

        let work = Arc::new(work);

        // Begin work.
        for _ in 0..threads {
            spawn_with(super_tx.clone(), work.clone(), self.acceptor.clone())
        }

        // Monitor for panics.
        // FIXME(reem): This won't ever exit since we still have a super_tx handle.
        for _ in supervisor_rx.iter() {
            spawn_with(super_tx.clone(), work.clone(), self.acceptor.clone());
        }
    }
}

fn spawn_with<A, F>(supervisor: mpsc::Sender<()>, work: Arc<F>, mut acceptor: A)
where A: NetworkListener + Send + 'static,
      F: Fn(<A as NetworkListener>::Stream) + Send + Sync + 'static {
    thread::spawn(move || {
        let _sentinel = Sentinel::new(supervisor, ());

        loop {
            match acceptor.accept() {
                Ok(stream) => work(stream),
                Err(e) => {
                    info!("Connection failed: {}", e);
                }
            }
        }
    });
}

struct Sentinel<T: Send + 'static> {
    value: Option<T>,
    supervisor: mpsc::Sender<T>,
}

impl<T: Send + 'static> Sentinel<T> {
    fn new(channel: mpsc::Sender<T>, data: T) -> Sentinel<T> {
        Sentinel {
            value: Some(data),
            supervisor: channel,
        }
    }
}

impl<T: Send + 'static> Drop for Sentinel<T> {
    fn drop(&mut self) {
        // Respawn ourselves
        let _ = self.supervisor.send(self.value.take().unwrap());
    }
}

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