Merge pull request #64 from Pennycook/clarify-atomics

Clarify introduction of atomic class

Author: keryell

latex/programming_interface.tex

@@ -3203,11 +3203,9 @@ \section{Synchronization and atomics}
 
 The SYCL specification provides atomic operations based on the C++11
 library syntax. The only available ordering, due to constraints of the
-OpenCL 1.2 memory model, is \codeinline{memory_order_relaxed}. No
-default order is supported because a default order would imply
-sequential consistency. The SYCL atomic library may map directly to
-the underlying C++11 library in host code, and must interact safely
-with the host C++11 atomic library when used in host code. The SYCL
+OpenCL 1.2 memory model, is \codeinline{memory_order_relaxed}.
+The SYCL atomic library may map directly to
+the underlying C++11 library on the host device. The SYCL
 library must be used in device code to ensure that only the limited
 subset of functionality is available. SYCL 1.2.1 device compilers should
 give a compilation error on use of the \codeinline{std::atomic}