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d75288fb27
This commit changes WAL archiver process so that it's treated as an auxiliary process and can use shared memory. This is an infrastructure patch required for upcoming shared-memory based stats collector patch series. These patch series basically need any processes including archiver that can report the statistics to access to shared memory. Since this patch itself is useful to simplify the code and when users monitor the status of archiver, it's committed separately in advance. This commit simplifies the code for WAL archiving. For example, previously backends need to signal to archiver via postmaster when they notify archiver that there are some WAL files to archive. On the other hand, this commit removes that signal to postmaster and enables backends to notify archier directly using shared latch. Also, as the side of this change, the information about archiver process becomes viewable at pg_stat_activity view. Author: Kyotaro Horiguchi Reviewed-by: Andres Freund, Álvaro Herrera, Julien Rouhaud, Tomas Vondra, Arthur Zakirov, Fujii Masao Discussion: https://postgr.es/m/20180629.173418.190173462.horiguchi.kyotaro@lab.ntt.co.jp
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* pgarch.h
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* Exports from postmaster/pgarch.c.
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/postmaster/pgarch.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _PGARCH_H
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#define _PGARCH_H
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/* ----------
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* Archiver control info.
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*
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* We expect that archivable files within pg_wal will have names between
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* MIN_XFN_CHARS and MAX_XFN_CHARS in length, consisting only of characters
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* appearing in VALID_XFN_CHARS. The status files in archive_status have
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* corresponding names with ".ready" or ".done" appended.
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* ----------
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*/
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#define MIN_XFN_CHARS 16
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#define MAX_XFN_CHARS 40
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#define VALID_XFN_CHARS "0123456789ABCDEF.history.backup.partial"
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extern Size PgArchShmemSize(void);
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extern void PgArchShmemInit(void);
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extern bool PgArchCanRestart(void);
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extern void PgArchiverMain(void) pg_attribute_noreturn();
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extern void PgArchWakeup(void);
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#endif /* _PGARCH_H */
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