task.rs.html -- source

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backtrace

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symbolize

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backtrace_sys

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bigtable

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bytes.rs debug.rs either.rs lib.rs

cfg_if

cookie

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cookie_store

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crc32fast

specialized

mod.rs pclmulqdq.rs

baseline.rs combine.rs lib.rs table.rs

crossbeam_deque

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sync

list.rs mod.rs queue.rs

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crossbeam_queue

array_queue.rs err.rs lib.rs seg_queue.rs

crossbeam_utils

atomic

atomic_cell.rs consume.rs mod.rs seq_lock.rs

sync

mod.rs parker.rs sharded_lock.rs wait_group.rs

backoff.rs cache_padded.rs lib.rs thread.rs

curl

easy

form.rs handle.rs handler.rs list.rs mod.rs windows.rs

error.rs lib.rs multi.rs panic.rs version.rs

curl_sys

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diyfp.rs dtoa.rs lib.rs

either

encoding_rs

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error_chain

backtrace.rs error_chain.rs impl_error_chain_kind.rs lib.rs quick_main.rs

failure

backtrace

internal.rs mod.rs

error

error_impl.rs mod.rs

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failure_derive

flate2

deflate

bufread.rs mod.rs read.rs write.rs

ffi

gz

bufread.rs mod.rs read.rs write.rs

zlib

bufread.rs mod.rs read.rs write.rs

bufreader.rs crc.rs lib.rs mem.rs zio.rs

fnv

foreign_types

foreign_types_shared

futures

future

sink

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stream

sync

mpsc

mod.rs queue.rs

bilock.rs mod.rs oneshot.rs

task_impl

std

data.rs mod.rs task_rc.rs unpark_mutex.rs

atomic_task.rs core.rs mod.rs

unsync

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executor.rs lib.rs lock.rs poll.rs resultstream.rs task.rs

futures_cpupool

goauth

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h2

http

header

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uri

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byte_str.rs convert.rs error.rs extensions.rs lib.rs method.rs request.rs response.rs status.rs version.rs

http_body

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iter.rs lib.rs macros.rs

hyper

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client

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io

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proto

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h2

client.rs mod.rs server.rs

server

conn.rs mod.rs shutdown.rs tcp.rs

service

make_service.rs mod.rs new_service.rs service.rs

error.rs headers.rs lib.rs rt.rs upgrade.rs

hyper_tls

client.rs lib.rs stream.rs

idna

lib.rs punycode.rs uts46.rs

indexmap

equivalent.rs lib.rs macros.rs map.rs mutable_keys.rs set.rs util.rs

iovec

sys

itoa

lazy_static

inline_lazy.rs lib.rs

libc

unix

linux_like

linux

gnu

b64

x86_64

align.rs mod.rs not_x32.rs

align.rs mod.rs

align.rs mod.rs

align.rs mod.rs

fixed_width_ints.rs lib.rs macros.rs

libz_sys

lock_api

lib.rs mutex.rs remutex.rs rwlock.rs

log

lib.rs macros.rs

matches

maybe_uninit

memoffset

lib.rs offset_of.rs span_of.rs

mime

lib.rs parse.rs

mime_guess

impl_bin_search.rs lib.rs

miniz_oxide

deflate

buffer.rs core.rs mod.rs stream.rs

inflate

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lib.rs shared.rs

mio

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imp

net2

sys

unix

impls.rs mod.rs

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

num_cpus

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openssl

openssl_probe

openssl_sys

parking_lot

condvar.rs deadlock.rs elision.rs lib.rs mutex.rs once.rs raw_mutex.rs raw_rwlock.rs remutex.rs rwlock.rs util.rs

parking_lot_core

thread_parker

linux.rs mod.rs

lib.rs parking_lot.rs spinwait.rs util.rs word_lock.rs

percent_encoding

proc_macro2

fallback.rs lib.rs strnom.rs wrapper.rs

protobuf

protobuf_json

publicsuffix

errors.rs lib.rs

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

rand

rand_chacha

chacha.rs lib.rs

rand_core

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hc128.rs lib.rs

rand_isaac

isaac.rs isaac64.rs isaac_array.rs lib.rs

rand_jitter

dummy_log.rs error.rs lib.rs platform.rs

rand_os

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rand_pcg

lib.rs pcg128.rs pcg64.rs

rand_xorshift

regex

literal

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regex_syntax

ast

mod.rs parse.rs print.rs visitor.rs

hir

literal

interval.rs mod.rs print.rs translate.rs visitor.rs

unicode_tables

either.rs error.rs lib.rs parser.rs unicode.rs utf8.rs

reqwest

rustc_demangle

legacy.rs lib.rs v0.rs

rustc_serialize

base64.rs collection_impls.rs hex.rs json.rs lib.rs serialize.rs

ryu

buffer

pretty

exponent.rs mantissa.rs mod.rs

common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs lib.rs

scopeguard

serde

de

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

private

de.rs macros.rs mod.rs ser.rs

ser

impls.rs impossible.rs mod.rs

export.rs integer128.rs lib.rs macros.rs

serde_codegen_internals

ast.rs attr.rs case.rs ctxt.rs lib.rs

serde_derive

internals

ast.rs attr.rs case.rs check.rs ctxt.rs mod.rs symbol.rs

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

serde_json

value

de.rs from.rs index.rs mod.rs partial_eq.rs ser.rs

de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

serde_urlencoded

ser

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

slab

smallvec

smpl_jwt

error.rs lib.rs

socket2

sys

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

string

syn

synom

helper.rs lib.rs space.rs

synstructure

lib.rs macros.rs

time

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

tokio

executor

current_thread

reactor

mod.rs poll_evented.rs

runtime

current_thread

builder.rs mod.rs runtime.rs

threadpool

builder.rs mod.rs shutdown.rs task_executor.rs

util

enumerate.rs future.rs mod.rs stream.rs

clock.rs io.rs lib.rs net.rs prelude.rs timer.rs

tokio_buf

util

chain.rs collect.rs from.rs iter.rs limit.rs mod.rs stream.rs

lib.rs never.rs size_hint.rs str.rs u8.rs

tokio_current_thread

lib.rs scheduler.rs

tokio_executor

enter.rs error.rs executor.rs global.rs lib.rs park.rs typed.rs

tokio_io

tokio_reactor

background.rs lib.rs poll_evented.rs registration.rs sharded_rwlock.rs

tokio_sync

mpsc

block.rs bounded.rs chan.rs list.rs mod.rs unbounded.rs

task

atomic_task.rs mod.rs

lib.rs lock.rs loom.rs oneshot.rs semaphore.rs watch.rs

tokio_tcp

incoming.rs lib.rs listener.rs stream.rs

tokio_threadpool

tokio_timer

try_from

char.rs int.rs lib.rs

try_lock

unicase

unicode

ascii.rs lib.rs

unicode_bidi

char_data

mod.rs tables.rs

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

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

uuid

adapter

core_support

parser

core_support.rs mod.rs std_support.rs

builder.rs core_support.rs lib.rs prelude.rs std_support.rs v4.rs

want

use futures::{Async, Poll, task::Task};

use super::Never;

/// A type to help "yield" a future, such that it is re-scheduled immediately.
///
/// Useful for spin counts, so a future doesn't hog too much time.
#[derive(Debug)]
pub(crate) struct YieldNow {
    cached_task: Option<Task>,
}

impl YieldNow {
    pub(crate) fn new() -> YieldNow {
        YieldNow {
            cached_task: None,
        }
    }

    /// Returns `Ok(Async::NotReady)` always, while also notifying the
    /// current task so that it is rescheduled immediately.
    ///
    /// Since it never returns `Async::Ready` or `Err`, those types are
    /// set to `Never`.
    pub(crate) fn poll_yield(&mut self) -> Poll<Never, Never> {
        // Check for a cached `Task` first...
        if let Some(ref t) = self.cached_task {
            if t.will_notify_current() {
                t.notify();
                return Ok(Async::NotReady);
            }
        }

        // No cached task, or not current, so get a new one...
        let t = ::futures::task::current();
        t.notify();
        self.cached_task = Some(t);
        Ok(Async::NotReady)
    }
}