[svn-r23473] Update the VOL plugin callbacks with better async I/O support:

 - change hid_t req in callbacks to void **req
 - change all callbacks to accept dxpl_ids (except dataset write and read which already do)
 - update all the private and public VL routines to accept a dxpl_id and event queue id
 - Add an async class for the VOL plugin with cancel, test, and wait request operations
 - add the external VOL log plugin test to the examples directory

NOTE that async operations are still not provided by the HDF5 API, so
all event queue IDs and requests passed to all plugins are NULL for
now.

Tested on jam.

1 files changed, 5 insertions, 5 deletions

diff --git a/src/H5R.c b/src/H5R.c
index 90d28ac..9a43563 100644
--- a/src/H5R.c
+++ b/src/H5R.c
@@ -374,7 +374,7 @@ H5Rcreate(void *ref, hid_t loc_id, const char *name, H5R_type_t ref_type, hid_t
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
 
     /* create the ref through the VOL */
-    if(ret_value = H5VL_object_misc(obj, loc_params, vol_plugin, H5VL_REF_CREATE, H5_REQUEST_NULL, 
+    if(ret_value = H5VL_object_misc(obj, loc_params, vol_plugin, H5VL_REF_CREATE, H5AC_dxpl_id, H5_EVENT_QUEUE_NULL, 
                                     ref, name, ref_type, space_id) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_LINKCOUNT, FAIL, "modifying object link count failed")
 
@@ -602,7 +602,7 @@ H5Rdereference2(hid_t obj_id, hid_t oapl_id, H5R_type_t ref_type, const void *_r
     loc_params.obj_type = H5I_get_type(obj_id);
 
     /* Open the object through the VOL */
-    if(NULL == (opened_obj = H5VL_object_open(obj, loc_params, vol_plugin, &opened_type, H5_REQUEST_NULL)))
+    if(NULL == (opened_obj = H5VL_object_open(obj, loc_params, vol_plugin, &opened_type, H5AC_dxpl_id, H5_EVENT_QUEUE_NULL)))
 	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to open object")
 
     /* Get an atom for the object */
@@ -734,7 +734,7 @@ H5Rget_region(hid_t id, H5R_type_t ref_type, const void *ref)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
 
     /* Get the space id through the VOL */
-    if(H5VL_object_get(obj, loc_params, vol_plugin, H5VL_REF_GET_REGION, H5_REQUEST_NULL, 
+    if(H5VL_object_get(obj, loc_params, vol_plugin, H5VL_REF_GET_REGION, H5AC_dxpl_id, H5_EVENT_QUEUE_NULL, 
                        &ret_value, ref_type, ref) < 0)
         HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group info")
 
@@ -882,7 +882,7 @@ H5Rget_obj_type2(hid_t id, H5R_type_t ref_type, const void *ref,
 
     /* get the object type through the VOL */
     if((ret_value = H5VL_object_get(obj, loc_params, vol_plugin, H5VL_REF_GET_TYPE, 
-                                    H5_REQUEST_NULL, obj_type, ref_type, ref)) < 0)
+                                    H5AC_dxpl_id, H5_EVENT_QUEUE_NULL, obj_type, ref_type, ref)) < 0)
         HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group info")
 
 done:
@@ -1049,7 +1049,7 @@ H5Rget_name(hid_t id, H5R_type_t ref_type, const void *_ref, char *name,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
 
     /* get the object type through the VOL */
-    if(H5VL_object_get(obj, loc_params, vol_plugin, H5VL_REF_GET_NAME, H5_REQUEST_NULL, 
+    if(H5VL_object_get(obj, loc_params, vol_plugin, H5VL_REF_GET_NAME, H5AC_dxpl_id, H5_EVENT_QUEUE_NULL, 
                        &ret_value, name, size, ref_type, _ref) < 0)
         HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group info")
 done: