eal: introduce destructor macros

This macro adds symbols to the .fini section using the global
RTE priorities, to ensure consistency.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Shreyansh Jain <shreyansh.jain@nxp.com>

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index a9df7c1..687dcef 100644 (file)
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -111,6 +111,29 @@ static void __attribute__((constructor(RTE_PRIO(prio)), used)) func(void)
 #define RTE_INIT(func) \
        RTE_INIT_PRIO(func, LAST)
 
+/**
+ * Run after main() with low priority.
+ *
+ * @param func
+ *   Destructor function name.
+ * @param prio
+ *   Priority number must be above 100.
+ *   Lowest number is the last to run.
+ */
+#define RTE_FINI_PRIO(func, prio) \
+static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
+
+/**
+ * Run after main() with high priority.
+ *
+ * The destructor will be run *before* prioritized destructors.
+ *
+ * @param func
+ *   Destructor function name.
+ */
+#define RTE_FINI(func) \
+       RTE_FINI_PRIO(func, LAST)
+
 /**
  * Force a function to be inlined
  */