had finished its work and closed the .h5 file, thus removing the shadow file.
Make the sparse writer wait to close the .h5 file for a signal from
testvfdswmr.sh. In testvfdswmr.sh, send the signal when the readers have all
finished.
(1) Increase the # of records to write (Nrecords) in testvfdswmr.sh.in so as to ensure the writer
will not exit before the reader
(2) Use H5E_BEGIN_TRY/END_TRY when H5Fopen() the test file in reader tests
(3) Add "READER" or "WRITER" to debugging messages
(4) Misc cleanup
--src/H5PB.c: checks for size >= page size
--src/H5MF.c: disable/enable page buffering in H5MF_tidy_self_referential_fsm_hack()
--src/H5MFsection.c: call H5PB_remove_entry() for both raw/metadata pages in H5MF__sect_small_merge()
(B) Port and modify existing concurrent swmr tests to VFD SWMR. Also modify the following:
--remove flushes from VFD SWMR writer tests
--set Nreaders to 0 in test/testvfdswmr.sh.in to test for writers only
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