[rtems-release commit] Mention zero size allocation changes

[Sebastian Huber]

Module:    rtems-release
Branch:    master
Commit:    f48aea09d8d82ab80568ad2edcd02b8a11bea886
Changeset: http://git.rtems.org/rtems-release/commit/?id=f48aea09d8d82ab80568ad2edcd02b8a11bea886

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Tue May  4 13:14:21 2021 +0200

Mention zero size allocation changes

---

 rtems-notes-6.md | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/rtems-notes-6.md b/rtems-notes-6.md
index cec71d0..39ebd29 100644
--- a/rtems-notes-6.md
+++ b/rtems-notes-6.md
@@ -39,7 +39,19 @@ Implementation improvements usually fall into one of the following categories:
 
 #### API Implementation Improvements
 
-* TBD
+* Zero size allocation results are now consistent accross directives, for
+  example `malloc( 0 )` and `posix_memalign( &p, align, 0 )` return now a
+  unique pointer (or `NULL` if the heap is empty).  In POSIX, zero size memory
+  allocations are implementation-defined behaviour.  The implementation has two
+  options:
+
+  * https://pubs.opengroup.org/onlinepubs/9699919799/functions/malloc.html
+
+  * https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_memalign.html
+
+  Linux and FreeBSD return a unique pointer for zero size memory allocations.
+  This approach is now also used in RTEMS as well throughout the memory
+  allocation directives
 
 #### API Deprecations