/src/postgres/src/backend/postmaster/auxprocess.c
Line | Count | Source (jump to first uncovered line) |
1 | | /*------------------------------------------------------------------------- |
2 | | * auxprocess.c |
3 | | * functions related to auxiliary processes. |
4 | | * |
5 | | * |
6 | | * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group |
7 | | * Portions Copyright (c) 1994, Regents of the University of California |
8 | | * |
9 | | * IDENTIFICATION |
10 | | * src/backend/postmaster/auxprocess.c |
11 | | *------------------------------------------------------------------------- |
12 | | */ |
13 | | #include "postgres.h" |
14 | | |
15 | | #include <unistd.h> |
16 | | #include <signal.h> |
17 | | |
18 | | #include "miscadmin.h" |
19 | | #include "pgstat.h" |
20 | | #include "postmaster/auxprocess.h" |
21 | | #include "storage/condition_variable.h" |
22 | | #include "storage/ipc.h" |
23 | | #include "storage/proc.h" |
24 | | #include "storage/procsignal.h" |
25 | | #include "utils/memutils.h" |
26 | | #include "utils/ps_status.h" |
27 | | |
28 | | |
29 | | static void ShutdownAuxiliaryProcess(int code, Datum arg); |
30 | | |
31 | | |
32 | | /* |
33 | | * AuxiliaryProcessMainCommon |
34 | | * |
35 | | * Common initialization code for auxiliary processes, such as the bgwriter, |
36 | | * walwriter, walreceiver, and the startup process. |
37 | | */ |
38 | | void |
39 | | AuxiliaryProcessMainCommon(void) |
40 | 0 | { |
41 | 0 | Assert(IsUnderPostmaster); |
42 | | |
43 | | /* Release postmaster's working memory context */ |
44 | 0 | if (PostmasterContext) |
45 | 0 | { |
46 | 0 | MemoryContextDelete(PostmasterContext); |
47 | 0 | PostmasterContext = NULL; |
48 | 0 | } |
49 | |
|
50 | 0 | init_ps_display(NULL); |
51 | |
|
52 | 0 | Assert(GetProcessingMode() == InitProcessing); |
53 | |
|
54 | 0 | IgnoreSystemIndexes = true; |
55 | | |
56 | | /* |
57 | | * As an auxiliary process, we aren't going to do the full InitPostgres |
58 | | * pushups, but there are a couple of things that need to get lit up even |
59 | | * in an auxiliary process. |
60 | | */ |
61 | | |
62 | | /* |
63 | | * Create a PGPROC so we can use LWLocks and access shared memory. |
64 | | */ |
65 | 0 | InitAuxiliaryProcess(); |
66 | |
|
67 | 0 | BaseInit(); |
68 | |
|
69 | 0 | ProcSignalInit(NULL, 0); |
70 | | |
71 | | /* |
72 | | * Auxiliary processes don't run transactions, but they may need a |
73 | | * resource owner anyway to manage buffer pins acquired outside |
74 | | * transactions (and, perhaps, other things in future). |
75 | | */ |
76 | 0 | CreateAuxProcessResourceOwner(); |
77 | | |
78 | | |
79 | | /* Initialize backend status information */ |
80 | 0 | pgstat_beinit(); |
81 | 0 | pgstat_bestart_initial(); |
82 | 0 | pgstat_bestart_final(); |
83 | | |
84 | | /* register a before-shutdown callback for LWLock cleanup */ |
85 | 0 | before_shmem_exit(ShutdownAuxiliaryProcess, 0); |
86 | |
|
87 | 0 | SetProcessingMode(NormalProcessing); |
88 | 0 | } |
89 | | |
90 | | /* |
91 | | * Begin shutdown of an auxiliary process. This is approximately the equivalent |
92 | | * of ShutdownPostgres() in postinit.c. We can't run transactions in an |
93 | | * auxiliary process, so most of the work of AbortTransaction() is not needed, |
94 | | * but we do need to make sure we've released any LWLocks we are holding. |
95 | | * (This is only critical during an error exit.) |
96 | | */ |
97 | | static void |
98 | | ShutdownAuxiliaryProcess(int code, Datum arg) |
99 | 0 | { |
100 | 0 | LWLockReleaseAll(); |
101 | 0 | ConditionVariableCancelSleep(); |
102 | 0 | pgstat_report_wait_end(); |
103 | 0 | } |