pgsql: Provide pg_preadv() and pg_pwritev().

From: Thomas Munro <tmunro(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Provide pg_preadv() and pg_pwritev().
Date: 2021-01-11 02:31:27
Message-ID: E1kymzP-0007zC-RH@gemulon.postgresql.org
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Provide pg_preadv() and pg_pwritev().

Provide synchronous vectored file I/O routines. These map to preadv()
and pwritev(), with fallback implementations for systems that don't have
them. Also provide a wrapper pg_pwritev_with_retry() that automatically
retries on short writes.

Reviewed-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Reviewed-by: Andres Freund <andres(at)anarazel(dot)de>
Discussion: https://postgr.es/m/CA%2BhUKGJA%2Bu-220VONeoREBXJ9P3S94Y7J%2BkqCnTYmahvZJwM%3Dg%40mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/13a021f3e8c99915b3cc0cb2021a948d9c71ff32

Modified Files
--------------
configure | 30 +------------
configure.ac | 9 +++-
src/include/pg_config.h.in | 15 +++++++
src/include/port.h | 2 +
src/include/port/pg_iovec.h | 59 ++++++++++++++++++++++++
src/port/Makefile | 2 +
src/port/pread.c | 43 +++++++++++++++++-
src/port/pwrite.c | 107 +++++++++++++++++++++++++++++++++++++++++++-
src/tools/msvc/Solution.pm | 5 +++
9 files changed, 238 insertions(+), 34 deletions(-)

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