From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Tue, 20 Nov 2018 22:03:45 +0000 (+0100)
Subject: Document CUDA::Handle better
X-Git-Tag: v9.1.0-rc1~545^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=649cb77d052addc43dc865e3addbc1cc993387d8;p=dealii.git

Document CUDA::Handle better
---

diff --git a/include/deal.II/base/cuda.h b/include/deal.II/base/cuda.h
index ad74e99284..0e6eafbb7b 100644
--- a/include/deal.II/base/cuda.h
+++ b/include/deal.II/base/cuda.h
@@ -36,13 +36,14 @@ namespace Utilities
   namespace CUDA
   {
     /**
-     * This structure creates, stores, and destroys the handles of the different
-     * CUDA libraries used inside deal.II.
+     * Various CUDA APIs need an object to store internal data. This structure
+     * creates, initializes, stores, and destroys these so-called handles for
+     * the respective CUDA libraries used inside deal.II.
      */
     struct Handle
     {
       /**
-       * Constructor. Create the handles for the different libraries.
+       * Constructor. Initialize the handles for the different libraries.
        */
       Handle();
 
@@ -52,17 +53,25 @@ namespace Utilities
       Handle(Handle const &) = delete;
 
       /**
-       * Destructor. Destroy the handles and free all the memory allocated by
-       * GrowingVectorMemory.
+       * Destructor. Destroy the handles.
        */
       ~Handle();
 
+      /**
+       * Pointer to an opaque cuSolverDN context.
+       * The handle must be passed to every cuSolverDN library function.
+       */
       cusolverDnHandle_t cusolver_dn_handle;
 
+      /**
+       * Pointer to an opaque cuSolverSP context.
+       * The handle must be passed to every cuSolverSP library function.
+       */
       cusolverSpHandle_t cusolver_sp_handle;
 
       /**
-       * Handle to the cuSPARSE library.
+       * Pointer to an opaque cuSPARSE context.
+       * The handle must be passed to every cuSPARSE library function.
        */
       cusparseHandle_t cusparse_handle;
     };