Add more efficient functions to pqformat API.
There's three prongs to achieve greater efficiency here:
1) Allow reusing a stringbuffer across pq_beginmessage/endmessage, with the new
pq_beginmessage_reuse/endmessage_reuse.This can be beneficial both because it avoids allocating the initial buffer,
andbecause it's more likely to already have an correctly sized buffer.
2) Replacing pq_sendint() with pq_sendint$width() inline functions. Previously unnecessary and unpredictable branches
in pq_sendint() were needed. Additionally the replacement functions are implemented more efficiently. pq_sendint is
nowdeprecated, a separate commit will convert all in-tree callers.
3) Add pq_writeint$width(), pq_writestring(). These rely on sufficient space in the StringInfo's buffer, avoiding
individualspace checks & potential individual resizing. To allow this to be used for strings, expose mbutil.c's
MAX_CONVERSION_GROWTH.
Followup commits will make use of these facilities.
Author: Andres Freund
Discussion: https://postgr.es/m/20170914063418.sckdzgjfrsbekae4@alap3.anarazel.de
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/1de09ad8eb1fa673ee7899d6dfbb2b49ba204818
Modified Files
--------------
src/backend/libpq/pqformat.c | 88 ++++++++-------------
src/backend/utils/mb/mbutils.c | 11 ---
src/include/libpq/pqformat.h | 168 ++++++++++++++++++++++++++++++++++++++++-
src/include/mb/pg_wchar.h | 11 +++
4 files changed, 208 insertions(+), 70 deletions(-)
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