Sha256: 815eca6bd64f4eef7c447f0809e84108f5428ff50225224b373efd8fbb696874
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Versions: 19
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Stored size: 1.05 KB
Contents
use std::fmt::{self, Debug};
use std::thread::{self, ThreadId};
/// ThreadBound is a Sync-maker and Send-maker that allows accessing a value
/// of type T only from the original thread on which the ThreadBound was
/// constructed.
pub struct ThreadBound<T> {
value: T,
thread_id: ThreadId,
}
unsafe impl<T> Sync for ThreadBound<T> {}
// Send bound requires Copy, as otherwise Drop could run in the wrong place.
unsafe impl<T: Copy> Send for ThreadBound<T> {}
impl<T> ThreadBound<T> {
pub fn new(value: T) -> Self {
ThreadBound {
value,
thread_id: thread::current().id(),
}
}
pub fn get(&self) -> Option<&T> {
if thread::current().id() == self.thread_id {
Some(&self.value)
} else {
None
}
}
}
impl<T: Debug> Debug for ThreadBound<T> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
match self.get() {
Some(value) => Debug::fmt(value, formatter),
None => formatter.write_str("unknown"),
}
}
}
Version data entries
19 entries across 19 versions & 1 rubygems