| From: | "Wang, Shenhao" <wangsh(dot)fnst(at)cn(dot)fujitsu(dot)com> |
|---|---|
| To: | "alvherre(at)alvh(dot)no-ip(dot)org" <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | a problem about XLogReader callback system |
| Date: | 2020-09-28 06:28:37 |
| Message-ID: | 2e9eed7d84fe4254bb6df1121d05caab@G08CNEXMBPEKD06.g08.fujitsu.local |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi, hackers
I have a problem about XLogReader callback system
In xlog.c, function StartupXLOG
xlogreader =
XLogReaderAllocate(wal_segment_size, NULL,
XL_ROUTINE(.page_read = &XLogPageRead,
.segment_open = NULL,
.segment_close = wal_segment_close),
&private);
XLogPageReader uses readFile to store the fd, and I can't find any location to set the value of seg.ws_file.
Is it necessary to set a segment_close callback?
Best regards
Wang
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