1 files changed, 12 insertions, 0 deletions
diff --git a/src/thread_id.rs b/src/thread_id.rs
new file mode 100644
index 0000000..00468b2
--- /dev/null
+++ b/src/thread_id.rs
@@ -0,0 +1,12 @@
+use std::num::NonZeroUsize;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+fn next() -> NonZeroUsize {
+    static COUNTER: AtomicUsize = AtomicUsize::new(1);
+    NonZeroUsize::new(COUNTER.fetch_add(1, Ordering::SeqCst)).expect("more than usize::MAX threads")
+}
+
+pub(crate) fn get() -> NonZeroUsize {
+    thread_local!(static THREAD_ID: NonZeroUsize = next());
+    THREAD_ID.with(|&x| x)
+}