Initial checkin of page buffer re-implementation to support VFD SWMR.

Tested serial / debug on Charis and Jelly.

Two known issues:

1) New page buffer seems to expose issues in the accumulator code.

   For whatever reason, fheap with the new page buffer exposes corruption
   issues if the page buffer uses H5F__accum_read/write(), but the problems
   go away if the page buffers uses H5FD_read/write() instead.

   Need to either chase this or dis-able page bufffer in combination with
   the accumulator.

2) Encountered a number of assertion failures that are explainable by the
   free space manager code not telling the page buffer to discard pages
   when they are freed.

   Wrote code to handle this -- once the free space manager is modified,
   this code should be removed and the original assertions restored.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/H5MF.c b/src/H5MF.c
index 0d368d4..3be5e0a 100644
--- a/src/H5MF.c
+++ b/src/H5MF.c
@@ -981,7 +981,7 @@ HDfprintf(stderr, "%s: alloc_type = %u, size = %Hu\n", FUNC, (unsigned)alloc_typ
 
             /* Insert the new page into the Page Buffer list of new pages so 
                we don't read an empty page from disk */
-            if(f->shared->page_buf != NULL && H5PB_add_new_page(f, alloc_type, new_page) < 0)
+            if(f->shared->pb_ptr != NULL && H5PB_add_new_page(f, alloc_type, new_page) < 0)
                 HGOTO_ERROR(H5E_RESOURCE, H5E_CANTINSERT, HADDR_UNDEF, "can't add new page to Page Buffer new page list")
 
             ret_value = new_page;