pending.rs.html -- source

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aho_corasick

packed

teddy

compile.rs mod.rs runtime.rs

api.rs mod.rs pattern.rs rabinkarp.rs vector.rs

ahocorasick.rs automaton.rs buffer.rs byte_frequencies.rs classes.rs dfa.rs error.rs lib.rs nfa.rs prefilter.rs state_id.rs

ansi_term

ansi.rs debug.rs difference.rs display.rs lib.rs style.rs windows.rs write.rs

atty

backtrace

backtrace

libunwind.rs mod.rs

symbolize

dladdr.rs libbacktrace.rs mod.rs

capture.rs lib.rs print.rs types.rs

backtrace_sys

bitflags

blindbid

blindbid.rs buffer.rs gadgets.rs main.rs pipe.rs

block_buffer

block_padding

bulletproofs

r1cs

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range_proof

dealer.rs messages.rs mod.rs party.rs

errors.rs generators.rs inner_product_proof.rs lib.rs transcript.rs util.rs

byte_tools

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chrono

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naive

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offset

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clap

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curve25519_dalek

backend

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u64

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digest

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dusk_blindbidproof

blindbid

mod.rs proof.rs verify.rs

futures

main.rs mod.rs prove.rs verify.rs

error.rs gadgets.rs lib.rs

dusk_tlv

error.rs lib.rs reader.rs writer.rs

dusk_uds

communication.rs lib.rs options.rs uds.rs worker.rs

env_logger

filter

mod.rs regex.rs

fmt

humantime

extern_impl.rs mod.rs

writer

termcolor

extern_impl.rs mod.rs

failure

backtrace

as_fail.rs compat.rs context.rs lib.rs result_ext.rs

failure_derive

fake_simd

futures

futures_channel

mpsc

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lib.rs lock.rs oneshot.rs

futures_core

task

__internal

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future.rs lib.rs stream.rs

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futures_util

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future

io

lock

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sink

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stream

task

mod.rs spawn.rs

lib.rs never.rs

generic_array

arr.rs functional.rs hex.rs impls.rs iter.rs lib.rs sequence.rs

humantime

date.rs duration.rs lib.rs wrapper.rs

keccak

lazy_static

inline_lazy.rs lib.rs

libc

unix

linux_like

linux

gnu

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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

log

lib.rs macros.rs

memchr

x86

avx.rs mod.rs sse2.rs

fallback.rs iter.rs lib.rs naive.rs

merlin

constants.rs lib.rs strobe.rs transcript.rs

num_cpus

num_integer

lib.rs roots.rs

num_traits

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

opaque_debug

packed_simd

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codegen

testing

api.rs codegen.rs lib.rs masks.rs sealed.rs testing.rs v128.rs v16.rs v256.rs v32.rs v512.rs v64.rs vPtr.rs vSize.rs

pin_utils

lib.rs projection.rs stack_pin.rs

proc_macro2

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

proc_macro_hack

proc_macro_nested

quick_error

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

rand_hc

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

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rustc_demangle

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serde

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private

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ser

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export.rs integer128.rs lib.rs macros.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

sha2

consts.rs lib.rs sha256.rs sha256_utils.rs sha512.rs sha512_utils.rs

sha3

lib.rs macros.rs paddings.rs reader.rs state.rs

slab

strsim

subtle

syn

synstructure

lib.rs macros.rs

termcolor

textwrap

indentation.rs lib.rs splitting.rs

thread_local

lib.rs thread_id.rs unreachable.rs

time

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

typenum

array.rs bit.rs int.rs lib.rs marker_traits.rs operator_aliases.rs private.rs type_operators.rs uint.rs

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

vec_map

use core::pin::Pin;
use futures_core::future::Future;
use futures_core::task::{Context, Poll};

/// A macro which yields to the event loop once.
///
/// This is equivalent to returning [`Poll::Pending`](futures_core::task::Poll)
/// from a [`Future::poll`](futures_core::future::Future::poll) implementation.
/// Similarly, when using this macro, it must be ensured that [`wake`](std::task::Waker::wake)
/// is called somewhere when further progress can be made.
///
/// This macro is only usable inside of async functions, closures, and blocks.
/// It is also gated behind the `async-await` feature of this library, which is
/// _not_ activated by default.
#[macro_export]
macro_rules! pending {
    () => {
        $crate::async_await::pending_once().await
    }
}

#[doc(hidden)]
pub fn pending_once() -> PendingOnce {
    PendingOnce { is_ready: false }
}

#[allow(missing_debug_implementations)]
#[doc(hidden)]
pub struct PendingOnce {
    is_ready: bool,
}

impl Future for PendingOnce {
    type Output = ();
    fn poll(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
        if self.is_ready {
            Poll::Ready(())
        } else {
            self.is_ready = true;
            Poll::Pending
        }
    }
}

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