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process startup: Split single user code out of PostgresMain().

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It was harder than necessary to understand PostgresMain() because the code for
a normal backend was interspersed with single-user mode specific code. Split
most of the single-user mode code into its own function
PostgresSingleUserMain(), that does all the necessary setup for single-user
mode, and then hands off after that to PostgresMain().

There still is some single-user mode code in InitPostgres(), and it'd likely
be worth moving at least some of it out. But that's for later.

Reviewed-By: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20210802164124.ufo5buo4apl6yuvs@alap3.anarazel.de
This commit is contained in:
Andres Freund
2021-09-08 12:19:50 -07:00
parent 499c9b1266
commit 7c83a3bf51
4 changed files with 90 additions and 80 deletions
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5
src/include/tcop/tcopprot.h
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@@ -75,8 +75,9 @@ extern void ProcessClientWriteInterrupt(bool blocked);
extern void process_postgres_switches(int argc, char *argv[],
GucContext ctx, const char **dbname);
extern void PostgresMain(int argc, char *argv[],
const char *dbname,
extern void PostgresSingleUserMain(int argc, char *argv[],
const char *username) pg_attribute_noreturn();
extern void PostgresMain(const char *dbname,
const char *username) pg_attribute_noreturn();
extern long get_stack_depth_rlimit(void);
extern void ResetUsage(void);