Add clib_mem_alloc_or_null(...)

Change-Id: I5177d6d3349384beb551b4f2f52b30b044ce335b
Signed-off-by: Dave Barach <dave@barachs.net>

2 files changed, 32 insertions, 10 deletions

diff --git a/vppinfra/vppinfra/mem.h b/vppinfra/vppinfra/mem.h
index d88254562c0..1260eab28c0 100644
--- a/vppinfra/vppinfra/mem.h
+++ b/vppinfra/vppinfra/mem.h
@@ -67,9 +67,10 @@ clib_mem_set_per_cpu_heap (u8 * new_heap)
   return old;
 }
 
-/* Memory allocator which returns null when it fails. */
+/* Memory allocator which may call os_out_of_memory() if it fails */
 always_inline void *
-clib_mem_alloc_aligned_at_offset (uword size, uword align, uword align_offset)
+clib_mem_alloc_aligned_at_offset (uword size, uword align, uword align_offset,
+				  int os_out_of_memory_on_failure)
 {
   void *heap, *p;
   uword offset, cpu;
@@ -97,25 +98,46 @@ clib_mem_alloc_aligned_at_offset (uword size, uword align, uword align_offset)
     }
   else
     {
-      os_out_of_memory ();
+      if (os_out_of_memory_on_failure)
+	os_out_of_memory ();
       return 0;
     }
 }
 
-/* Memory allocator which returns null when it fails. */
+/* Memory allocator which calls os_out_of_memory() when it fails */
 always_inline void *
 clib_mem_alloc (uword size)
 {
   return clib_mem_alloc_aligned_at_offset (size, /* align */ 1,
-					   /* align_offset */ 0);
+					   /* align_offset */ 0,
+					   /* os_out_of_memory */ 1);
 }
 
 always_inline void *
 clib_mem_alloc_aligned (uword size, uword align)
 {
-  return clib_mem_alloc_aligned_at_offset (size, align, /* align_offset */ 0);
+  return clib_mem_alloc_aligned_at_offset (size, align, /* align_offset */ 0,
+					   /* os_out_of_memory */ 1);
 }
 
+/* Memory allocator which calls os_out_of_memory() when it fails */
+always_inline void *
+clib_mem_alloc_or_null (uword size)
+{
+  return clib_mem_alloc_aligned_at_offset (size, /* align */ 1,
+					   /* align_offset */ 0,
+					   /* os_out_of_memory */ 0);
+}
+
+always_inline void *
+clib_mem_alloc_aligned_or_null (uword size, uword align)
+{
+  return clib_mem_alloc_aligned_at_offset (size, align, /* align_offset */ 0,
+					   /* os_out_of_memory */ 0);
+}
+
+
+
 /* Memory allocator which panics when it fails.
    Use macro so that clib_panic macro can expand __FUNCTION__ and __LINE__. */
 #define clib_mem_alloc_aligned_no_fail(size,align)				\
diff --git a/vppinfra/vppinfra/vec.c b/vppinfra/vppinfra/vec.c
index f711679b0a4..2d7ae1d4dc6 100644
--- a/vppinfra/vppinfra/vec.c
+++ b/vppinfra/vppinfra/vec.c
@@ -56,9 +56,8 @@ vec_resize_allocate_memory (void *v,
 
   if (!v)
     {
-      new =
-	clib_mem_alloc_aligned_at_offset (data_bytes, data_align,
-					  header_bytes);
+      new = clib_mem_alloc_aligned_at_offset (data_bytes, data_align, header_bytes, 1	/* yes, call os_out_of_memory */
+	);
       data_bytes = clib_mem_size (new);
       memset (new, 0, data_bytes);
       v = new + header_bytes;
@@ -84,7 +83,8 @@ vec_resize_allocate_memory (void *v,
 
   new =
     clib_mem_alloc_aligned_at_offset (new_alloc_bytes, data_align,
-				      header_bytes);
+				      header_bytes,
+				      1 /* yes, call os_out_of_memory */ );
 
   /* FIXME fail gracefully. */
   if (!new)