From: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Date: Fri, 22 Jul 2016 14:02:01 +0000 (+0100)
Subject: eal: add tailq safe iterator macro
X-Git-Tag: spdx-start~6099
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=954d6cf5741e2a3efb7f97852833a1ee0a1f165a;p=dpdk.git

eal: add tailq safe iterator macro

Removing/freeing elements elements within a TAILQ_FOREACH loop is not safe.
FreeBSD defines TAILQ_FOREACH_SAFE macro, which permits
these operations safely.
This patch defines this macro for Linux systems, where it is not defined.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---

diff --git a/lib/librte_eal/common/include/rte_tailq.h b/lib/librte_eal/common/include/rte_tailq.h
index 4a686e68a8..cc3c0f1de4 100644
--- a/lib/librte_eal/common/include/rte_tailq.h
+++ b/lib/librte_eal/common/include/rte_tailq.h
@@ -155,6 +155,14 @@ void __attribute__((constructor, used)) tailqinitfn_ ##t(void) \
 		rte_panic("Cannot initialize tailq: %s\n", t.name); \
 }
 
+/* This macro permits both remove and free var within the loop safely.*/
+#ifndef TAILQ_FOREACH_SAFE
+#define TAILQ_FOREACH_SAFE(var, head, field, tvar)		\
+	for ((var) = TAILQ_FIRST((head));			\
+	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);	\
+	    (var) = (tvar))
+#endif
+
 #ifdef __cplusplus
 }
 #endif