thread_id.rs.html -- source

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derive_more

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ed25519_dalek

constants.rs ed25519.rs errors.rs lib.rs public.rs secret.rs signature.rs

either

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ethbloom

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hash.rs lib.rs uint.rs

failure

backtrace

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error

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getrandom

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gimli

hash256_std_hasher

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align.rs mod.rs

align.rs mod.rs

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lock_api

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

log

lib.rs macros.rs

memchr

x86

avx.rs mod.rs sse2.rs

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

memory_db

memory_units

merlin

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

nodrop

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num_rational

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object

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opaque_debug

pallet_bridge

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parity_scale_codec_derive

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parity_util_mem

allocators.rs lib.rs malloc_size.rs primitives_impls.rs

parity_util_mem_derive

parity_wasm

parking_lot

condvar.rs deadlock.rs elision.rs fair_mutex.rs lib.rs mutex.rs once.rs raw_fair_mutex.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

paste

paste_impl

enum_hack.rs lib.rs

pbkdf2

pin_project

pin_project_internal

pin_project

attribute.rs derive.rs mod.rs

lib.rs pinned_drop.rs project.rs utils.rs

pin_utils

lib.rs projection.rs stack_pin.rs

ppv_lite86

x86_64

lib.rs soft.rs types.rs

primitive_types

proc_macro2

detection.rs fallback.rs lib.rs parse.rs wrapper.rs

proc_macro_crate

proc_macro_hack

error.rs iter.rs lib.rs parse.rs quote.rs

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

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

rand_pcg

lib.rs pcg128.rs pcg64.rs

ref_cast

lib.rs trivial.rs

ref_cast_impl

regex

regex_syntax

rental

rental_impl

rlp

error.rs impls.rs lib.rs rlpin.rs stream.rs traits.rs

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

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

ser

fmt.rs impls.rs impossible.rs mod.rs

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

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

offchain

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

sp_state_machine

sp_std

lib.rs with_std.rs

sp_storage

sp_tracing

lib.rs proxy.rs

sp_trie

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

sp_version

sp_wasm_interface

lib.rs wasmi_impl.rs

stable_deref_trait

static_assertions

assert_cfg.rs assert_eq_align.rs assert_eq_size.rs assert_fields.rs assert_impl.rs assert_obj_safe.rs assert_trait.rs assert_type.rs const_assert.rs lib.rs

substrate_bip39

subtle

syn

synstructure

lib.rs macros.rs

thread_local

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

tiny_keccak

keccak.rs lib.rs

toml

datetime.rs de.rs lib.rs macros.rs map.rs ser.rs spanned.rs tokens.rs value.rs

tracing

dispatcher.rs field.rs level_filters.rs lib.rs macros.rs span.rs stdlib.rs subscriber.rs

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

// Copyright 2017 Amanieu d'Antras
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

use std::collections::BinaryHeap;
use std::sync::Mutex;
use std::usize;

// Thread ID manager which allocates thread IDs. It attempts to aggressively
// reuse thread IDs where possible to avoid cases where a ThreadLocal grows
// indefinitely when it is used by many short-lived threads.
struct ThreadIdManager {
    limit: usize,
    free_list: BinaryHeap<usize>,
}
impl ThreadIdManager {
    fn new() -> ThreadIdManager {
        ThreadIdManager {
            limit: usize::MAX,
            free_list: BinaryHeap::new(),
        }
    }
    fn alloc(&mut self) -> usize {
        if let Some(id) = self.free_list.pop() {
            id
        } else {
            let id = self.limit;
            self.limit = self.limit.checked_sub(1).expect("Ran out of thread IDs");
            id
        }
    }
    fn free(&mut self, id: usize) {
        self.free_list.push(id);
    }
}
lazy_static! {
    static ref THREAD_ID_MANAGER: Mutex<ThreadIdManager> = Mutex::new(ThreadIdManager::new());
}

// Non-zero integer which is unique to the current thread while it is running.
// A thread ID may be reused after a thread exits.
struct ThreadId(usize);
impl ThreadId {
    fn new() -> ThreadId {
        ThreadId(THREAD_ID_MANAGER.lock().unwrap().alloc())
    }
}
impl Drop for ThreadId {
    fn drop(&mut self) {
        THREAD_ID_MANAGER.lock().unwrap().free(self.0);
    }
}
thread_local!(static THREAD_ID: ThreadId = ThreadId::new());

/// Returns a non-zero ID for the current thread
pub fn get() -> usize {
    THREAD_ID.with(|x| x.0)
}