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Use thread local to cache current thread id #11

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9 changes: 7 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -96,11 +96,16 @@
#[cfg_attr(docsrs, doc(cfg(feature = "futures")))]
mod futures;

use std::cell::Cell;
use std::fmt;
use std::mem::{self, ManuallyDrop};
use std::ops::{Deref, DerefMut, Drop};
use std::thread::{self, ThreadId};

thread_local! {
static THREAD_ID: Cell<ThreadId> = Cell::new(thread::current().id());
}

/// A wrapper which allows you to move around non-[`Send`]-types between threads, as long as you access the contained
/// value only from within the original thread and make sure that it is dropped from within the original thread.
pub struct SendWrapper<T> {
Expand All @@ -114,13 +119,13 @@ impl<T> SendWrapper<T> {
pub fn new(data: T) -> SendWrapper<T> {
SendWrapper {
data: ManuallyDrop::new(data),
thread_id: thread::current().id(),
thread_id: THREAD_ID.get(),
}
}

/// Returns `true` if the value can be safely accessed from within the current thread.
pub fn valid(&self) -> bool {
self.thread_id == thread::current().id()
self.thread_id == THREAD_ID.get()
}

/// Takes the value out of the `SendWrapper<T>`.
Expand Down