From b6a80f0fd9b0c155d0a46488c6729ed68dec97bd Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@collabora.com>
Date: Thu, 21 Sep 2023 13:47:33 +0100
Subject: [PATCH] xrt: Add xrt_limited_unique_id

---
 src/xrt/include/xrt/xrt_defines.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/xrt/include/xrt/xrt_defines.h b/src/xrt/include/xrt/xrt_defines.h
index ce54a9ea4..a436578b2 100644
--- a/src/xrt/include/xrt/xrt_defines.h
+++ b/src/xrt/include/xrt/xrt_defines.h
@@ -68,6 +68,25 @@ struct xrt_luid
  */
 typedef struct xrt_luid xrt_luid_t;
 
+/*!
+ * A limited unique id, it's only unique for the process it's in so must not be
+ * used or synchronized across process boundaries. A value of zero is invalid
+ * and means it hasn't be properly initialised.
+ *
+ * @ingroup xrt_iface
+ */
+struct xrt_limited_unique_id
+{
+	uint64_t data;
+};
+
+/*!
+ * Typedef for @ref xrt_limited_unique_id.
+ *
+ * @ingroup xrt_iface
+ */
+typedef struct xrt_limited_unique_id xrt_limited_unique_id_t;
+
 /*!
  * A base class for reference counted objects.
  *