thread_id.rs.html -- source

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regex

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rustc_serialize

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ryu

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serde

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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

serde_json

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serde_urlencoded

ser

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

serde_yaml

value

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de.rs error.rs lib.rs mapping.rs number.rs path.rs ser.rs

slab

socket2

sys

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

syn

thread_local

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

time

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

tinyvec

array.rs arrayvec.rs lib.rs tinyvec.rs

tokio

future

maybe_done.rs mod.rs poll_fn.rs ready.rs try_join.rs

io

loom

std

atomic_ptr.rs atomic_u16.rs atomic_u32.rs atomic_u64.rs atomic_u8.rs atomic_usize.rs mod.rs unsafe_cell.rs

macros

cfg.rs join.rs loom.rs mod.rs pin.rs ready.rs scoped_tls.rs select.rs support.rs thread_local.rs try_join.rs

net

tcp

incoming.rs listener.rs mod.rs split.rs split_owned.rs stream.rs

park

either.rs mod.rs thread.rs

runtime

stream

all.rs any.rs chain.rs collect.rs empty.rs filter.rs filter_map.rs fold.rs fuse.rs iter.rs map.rs merge.rs mod.rs next.rs once.rs pending.rs skip.rs skip_while.rs stream_map.rs take.rs take_while.rs timeout.rs try_next.rs

sync

task

blocking.rs mod.rs spawn.rs yield_now.rs

time

driver

atomic_stack.rs entry.rs handle.rs mod.rs registration.rs stack.rs

wheel

level.rs mod.rs stack.rs

clock.rs delay.rs delay_queue.rs error.rs instant.rs interval.rs mod.rs throttle.rs timeout.rs

util

slab

addr.rs entry.rs generation.rs mod.rs page.rs shard.rs slot.rs stack.rs

bit.rs intrusive_double_linked_list.rs linked_list.rs mod.rs rand.rs trace.rs wake.rs

coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_tls

tokio_util

codec

bytes_codec.rs decoder.rs encoder.rs framed.rs framed_read.rs framed_write.rs length_delimited.rs lines_codec.rs mod.rs

tower_service

tracing

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

tracing_core

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

tracing_futures

executor

lib.rs stdlib.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 no_std_prelude.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

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

waiter

want

yaml_rust

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

// 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)
}

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