X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=readme.md;h=57a211a151edd30d5cb78d464f6530f92d88f6f2;hb=ec943d1ee65b0e36406be135f1c3e58be65671b7;hp=54c6f15b6e71c596ce456e0dc75d492c7bd379b7;hpb=056d289619d45ccf1055c18d63cb3bad072a71a0;p=libcds.git

diff --git a/readme.md b/readme.md
index 54c6f15b..57a211a1 100644
--- a/readme.md
+++ b/readme.md
@@ -24,7 +24,7 @@ The library contains the implementations of the following containers:
   - several algo for lock-free queue, including classic Michael & Scott algorithm and its derivatives,
     the flat combining queue, the segmented queue.
   - several implementation of unordered set/map - lock-free and fine-grained lock-based
-  - [flat-combining] (http://mcg.cs.tau.ac.il/projects/projects/flat-combining) technique
+  - [flat-combining](http://mcg.cs.tau.ac.il/projects/projects/flat-combining) technique
   - lock-free [skip-list](http://en.wikipedia.org/wiki/Skip_list)
   - lock-free FeldmanHashMap/Set [Multi-Level Array Hash](http://samos-conference.com/Resources_Samos_Websites/Proceedings_Repository_SAMOS/2013/Files/2013-IC-20.pdf)
     with thread-safe bidirectional iterator support
@@ -46,6 +46,16 @@ Evolution of libcds (Gource visualization by Landon Wilkins): https://www.youtub
    - *nix: [use CMake](build/cmake/readme.md)
    - Windows: use MS Visual C++ 2015 project
 
+Some parts of libcds may depend on DCAS (double-width compare-and-swap) atomic primitive if
+the target architecture supports it. For x86, cmake build script enables `-mcx16` compiler flag that
+switches DCAS support on. You may manually disable DCAS support with the following command line flags
+in GCC/clang (for MS VC++ compiler DCAS is not supported):
+  - `-DCDS_DISABLE_128BIT_ATOMIC` - for 64bit build
+  - `-DCDS_DISABLE_64BIT_ATOMIC` - for 32bit build
+
+**All your projects AND libcds MUST be compiled with the same flags - either with DCAS support or without it.**
+   
+   
 **Pull request requirements**
 - Pull-request to *master* branch will be unconditionally rejected
 - *integration* branch is intended for pull-request. Usually, *integration* branch is the same as *master*