Add config option to use dlmalloc instead of mheap

Configure w/ --enable-dlmalloc, see .../build-data/platforms/vpp.mk

src/vppinfra/dlmalloc.[ch] are slightly modified versions of the
well-known Doug Lea malloc. Main advantage: dlmalloc mspaces have no
inherent size limit.

Change-Id: I19b3f43f3c65bcfb82c1a265a97922d01912446e
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vppinfra/mem_mheap.c b/src/vppinfra/mem_mheap.c
index 9b2af52..f3387b7 100644
--- a/src/vppinfra/mem_mheap.c
+++ b/src/vppinfra/mem_mheap.c
@@ -95,6 +95,25 @@
   return heap;
 }
 
+void *
+clib_mem_init_thread_safe (void *memory, uword memory_size)
+{
+  mheap_t *h;
+  u8 *heap;
+
+  clib_mem_init (memory, memory_size);
+
+  heap = clib_mem_get_per_cpu_heap ();
+  ASSERT (heap);
+
+  h = mheap_header (heap);
+
+  /* make the main heap thread-safe */
+  h->flags |= MHEAP_FLAG_THREAD_SAFE;
+
+  return heap;
+}
+
 #ifdef CLIB_LINUX_KERNEL
 #include <asm/page.h>