From 614ac5da53bca8c8fad5733e6749ec8753c52f28 Mon Sep 17 00:00:00 2001 From: Dave Barach Date: Mon, 6 Feb 2017 09:28:03 -0500 Subject: Add pool_get[_aligned]_will_expand(...) Change-Id: Iefffcf7843dc11803d69a875a72704a2543911a1 Signed-off-by: Dave Barach --- src/vppinfra/vec.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) (limited to 'src/vppinfra/vec.h') diff --git a/src/vppinfra/vec.h b/src/vppinfra/vec.h index eed96d6b9c2..d70e9ce1276 100644 --- a/src/vppinfra/vec.h +++ b/src/vppinfra/vec.h @@ -145,6 +145,46 @@ _vec_resize (void *v, data_align)); } +/** \brief Low-level vector resize predicate + + @param v pointer to a vector + @param length_increment length increment in elements + @param data_bytes requested size in bytes + @param header_bytes header size in bytes (may be zero) + @param data_align alignment (may be zero) + @return v_prime pointer to resized vector, may or may not equal v +*/ + +always_inline int +_vec_resize_will_expand (void *v, + word length_increment, + uword data_bytes, uword header_bytes, + uword data_align) +{ + vec_header_t *vh = _vec_find (v); + uword new_data_bytes, aligned_header_bytes; + + aligned_header_bytes = vec_header_bytes (header_bytes); + + new_data_bytes = data_bytes + aligned_header_bytes; + + if (PREDICT_TRUE (v != 0)) + { + void *p = v - aligned_header_bytes; + + /* Vector header must start heap object. */ + ASSERT (clib_mem_is_heap_object (p)); + + /* Typically we'll not need to resize. */ + if (new_data_bytes <= clib_mem_size (p)) + { + vh->len += length_increment; + return 0; + } + } + return 1; +} + /** \brief Predicate function, says whether the supplied vector is a clib heap object (general version). -- cgit 1.2.3-korg