noop_waker.rs.html -- source

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paste

paste_impl

enum_hack.rs lib.rs

pbkdf2

pin_project

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pin_utils

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ppv_lite86

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primitive_types

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proc_macro_crate

proc_macro_hack

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proc_macro_nested

quote

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

radium

rand

rand_chacha

chacha.rs guts.rs lib.rs

rand_core

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rand_pcg

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ref_cast

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ref_cast_impl

regex

regex_syntax

rental

rental_impl

rlp

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rustc_demangle

legacy.rs lib.rs v0.rs

rustc_hash

rustc_hex

schnorrkel

batch.rs cert.rs context.rs derive.rs errors.rs keys.rs lib.rs musig.rs points.rs scalars.rs serdey.rs sign.rs vrf.rs

scopeguard

secp256k1

ecmult

der.rs ecdh.rs ecdsa.rs error.rs field.rs group.rs lib.rs scalar.rs

serde

de

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

private

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ser

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serde_derive

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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

slab

smallvec

sp_application_crypto

ecdsa.rs ed25519.rs lib.rs sr25519.rs traits.rs

sp_arithmetic

biguint.rs fixed_point.rs helpers_128bit.rs lib.rs per_things.rs rational128.rs traits.rs

sp_core

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mod.rs storage.rs testing.rs

changes_trie.rs crypto.rs ecdsa.rs ed25519.rs hash.rs hasher.rs hashing.rs hexdisplay.rs lib.rs sandbox.rs sr25519.rs tasks.rs testing.rs traits.rs u32_trait.rs uint.rs vrf.rs

sp_debug_derive

impls.rs lib.rs

sp_externalities

extensions.rs lib.rs scope_limited.rs

sp_inherents

sp_io

batch_verifier.rs lib.rs

sp_panic_handler

sp_runtime

generic

block.rs checked_extrinsic.rs digest.rs era.rs header.rs mod.rs unchecked_extrinsic.rs

offchain

http.rs mod.rs storage.rs storage_lock.rs

curve.rs lib.rs random_number_generator.rs runtime_string.rs testing.rs traits.rs transaction_validity.rs

sp_runtime_interface

host.rs impls.rs lib.rs pass_by.rs util.rs wasm.rs

sp_runtime_interface_proc_macro

pass_by

codec.rs enum_.rs inner.rs mod.rs

runtime_interface

bare_function_interface.rs host_function_interface.rs mod.rs trait_decl_impl.rs

lib.rs utils.rs

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lib.rs with_std.rs

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sp_trie

error.rs lib.rs node_codec.rs node_header.rs storage_proof.rs trie_stream.rs

sp_version

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lib.rs wasmi_impl.rs

stable_deref_trait

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substrate_bip39

subtle

syn

synstructure

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tiny_keccak

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toml

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tracing

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tracing_attributes

tracing_core

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

trie_db

trie_root

twox_hash

lib.rs sixty_four.rs std_support.rs thirty_two.rs

typenum

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

uint

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

wasmi

memory

mmap_bytebuf.rs mod.rs

prepare

compile.rs mod.rs

func.rs global.rs host.rs imports.rs isa.rs lib.rs module.rs nan_preserving_float.rs runner.rs table.rs types.rs value.rs

wasmi_validation

context.rs func.rs lib.rs stack.rs util.rs

zeroize

zeroize_derive

//! Utilities for creating zero-cost wakers that don't do anything.

use core::task::{RawWaker, RawWakerVTable, Waker};
use core::ptr::null;
#[cfg(feature = "std")]
use once_cell::sync::Lazy;

unsafe fn noop_clone(_data: *const ()) -> RawWaker {
    noop_raw_waker()
}

unsafe fn noop(_data: *const ()) {}

const NOOP_WAKER_VTABLE: RawWakerVTable = RawWakerVTable::new(noop_clone, noop, noop, noop);

fn noop_raw_waker() -> RawWaker {
    RawWaker::new(null(), &NOOP_WAKER_VTABLE)
}

/// Create a new [`Waker`] which does
/// nothing when `wake()` is called on it.
///
/// # Examples
///
/// ```
/// use futures::task::noop_waker;
/// let waker = noop_waker();
/// waker.wake();
/// ```
#[inline]
pub fn noop_waker() -> Waker {
    unsafe {
        Waker::from_raw(noop_raw_waker())
    }
}

/// Get a static reference to a [`Waker`] which
/// does nothing when `wake()` is called on it.
///
/// # Examples
///
/// ```
/// use futures::task::noop_waker_ref;
/// let waker = noop_waker_ref();
/// waker.wake_by_ref();
/// ```
#[inline]
#[cfg(feature = "std")]
pub fn noop_waker_ref() -> &'static Waker {
    static NOOP_WAKER_INSTANCE: Lazy<Waker> = Lazy::new(noop_waker);
    &*NOOP_WAKER_INSTANCE
}

#[cfg(test)]
mod tests {
    #[test]
    #[cfg(feature = "std")]
    fn issue_2091_cross_thread_segfault() {
        let waker = std::thread::spawn(super::noop_waker_ref).join().unwrap();
        waker.wake_by_ref();
    }
}