diff --git a/arch/x64/linux/concurrency/thread.S b/arch/x64/linux/concurrency/thread.S
new file mode 100644
index 0000000..c211d76
--- /dev/null
+++ b/arch/x64/linux/concurrency/thread.S
@@ -0,0 +1,8 @@
+	.text
+
+	.globl thrd_current
+	.type thrd_current, @function
+
+thrd_current:
+	mov %fs:0, %rax
+	ret