Add read_stream_{pause,resume}()
Read stream users can now pause lookahead when no blocks are currently
available. After resuming, subsequent read_stream_next_buffer() calls
continue lookahead with the previous lookahead distance.
This is especially useful for read stream users with self-referential
access patterns (where consuming already-read buffers can produce
additional block numbers).
Author: Thomas Munro <[email protected]>
Reviewed-by: Melanie Plageman <[email protected]>
Reviewed-by: Nazir Bilal Yavuz <[email protected]>
Discussion:
https://postgr.es/m/CA%2BhUKGJLT2JvWLEiBXMbkSSc5so_Y7%3DN%2BS2ce7npjLw8QL3d5w%40mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/38229cb905165fe676ab8728cb9dd0833a5534ed
Modified Files
--------------
src/backend/storage/aio/read_stream.c | 27 +++++++++++++++++++++++++++
src/include/storage/read_stream.h | 2 ++
2 files changed, 29 insertions(+)
