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--- apr-1.4.2/include/apr_ring.h.pr50190
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+++ apr-1.4.2/include/apr_ring.h
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@@ -90,8 +90,8 @@
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  */
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 #define APR_RING_HEAD(head, elem)					\
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     struct head {							\
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-	struct elem *next;						\
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-	struct elem *prev;						\
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+	struct elem * volatile next;					\
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+	struct elem * volatile prev;					\
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     }
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 /**