From 5abe95c474262dfc0d43cd8fdd5248c9b48a8ecf Mon Sep 17 00:00:00 2001
From: Gediminas Jakutis <gediminas@varciai.lt>
Date: Fri, 4 Nov 2016 16:56:55 +0200
Subject: definitions: add a run-once construct macro.

---
 include/rin/definitions.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/rin/definitions.h b/include/rin/definitions.h
index bc417b5..8364f42 100644
--- a/include/rin/definitions.h
+++ b/include/rin/definitions.h
@@ -29,4 +29,13 @@
 #	define WEAK_SYM
 #endif
 
+#define rin_once(func) \
+do { \
+	static unsigned int __rin_firstrun = 1; \
+	if (__rin_firstrun) { \
+		--__rin_firstrun; \
+		func; \
+	} \
+} while (0)
+
 #endif /* LIBRIN_DEFINITIONS_INCLUDED */
-- 
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