1/*-------------------------------------------------------------------------
2 *
3 * globals.c
4 * global variable declarations
5 *
6 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/utils/init/globals.c
12 *
13 * NOTES
14 * Globals used all over the place should be declared here and not
15 * in other modules.
16 *
17 *-------------------------------------------------------------------------
18 */
19#include "postgres.h"
20
21#include "common/file_perm.h"
22#include "libpq/libpq-be.h"
23#include "libpq/pqcomm.h"
24#include "miscadmin.h"
25#include "storage/backendid.h"
26
27
28ProtocolVersion FrontendProtocol;
29
30volatile sig_atomic_t InterruptPending = false;
31volatile sig_atomic_t QueryCancelPending = false;
32volatile sig_atomic_t ProcDiePending = false;
33volatile sig_atomic_t ClientConnectionLost = false;
34volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false;
35volatile sig_atomic_t ConfigReloadPending = false;
36volatile uint32 InterruptHoldoffCount = 0;
37volatile uint32 QueryCancelHoldoffCount = 0;
38volatile uint32 CritSectionCount = 0;
39
40int MyProcPid;
41pg_time_t MyStartTime;
42TimestampTz MyStartTimestamp;
43struct Port *MyProcPort;
44int32 MyCancelKey;
45int MyPMChildSlot;
46
47/*
48 * MyLatch points to the latch that should be used for signal handling by the
49 * current process. It will either point to a process local latch if the
50 * current process does not have a PGPROC entry in that moment, or to
51 * PGPROC->procLatch if it has. Thus it can always be used in signal handlers,
52 * without checking for its existence.
53 */
54struct Latch *MyLatch;
55
56/*
57 * DataDir is the absolute path to the top level of the PGDATA directory tree.
58 * Except during early startup, this is also the server's working directory;
59 * most code therefore can simply use relative paths and not reference DataDir
60 * explicitly.
61 */
62char *DataDir = NULL;
63
64/*
65 * Mode of the data directory. The default is 0700 but it may be changed in
66 * checkDataDir() to 0750 if the data directory actually has that mode.
67 */
68int data_directory_mode = PG_DIR_MODE_OWNER;
69
70char OutputFileName[MAXPGPATH]; /* debugging output file */
71
72char my_exec_path[MAXPGPATH]; /* full path to my executable */
73char pkglib_path[MAXPGPATH]; /* full path to lib directory */
74
75#ifdef EXEC_BACKEND
76char postgres_exec_path[MAXPGPATH]; /* full path to backend */
77
78/* note: currently this is not valid in backend processes */
79#endif
80
81BackendId MyBackendId = InvalidBackendId;
82
83BackendId ParallelMasterBackendId = InvalidBackendId;
84
85Oid MyDatabaseId = InvalidOid;
86
87Oid MyDatabaseTableSpace = InvalidOid;
88
89/*
90 * DatabasePath is the path (relative to DataDir) of my database's
91 * primary directory, ie, its directory in the default tablespace.
92 */
93char *DatabasePath = NULL;
94
95pid_t PostmasterPid = 0;
96
97/*
98 * IsPostmasterEnvironment is true in a postmaster process and any postmaster
99 * child process; it is false in a standalone process (bootstrap or
100 * standalone backend). IsUnderPostmaster is true in postmaster child
101 * processes. Note that "child process" includes all children, not only
102 * regular backends. These should be set correctly as early as possible
103 * in the execution of a process, so that error handling will do the right
104 * things if an error should occur during process initialization.
105 *
106 * These are initialized for the bootstrap/standalone case.
107 */
108bool IsPostmasterEnvironment = false;
109bool IsUnderPostmaster = false;
110bool IsBinaryUpgrade = false;
111bool IsBackgroundWorker = false;
112
113bool ExitOnAnyError = false;
114
115int DateStyle = USE_ISO_DATES;
116int DateOrder = DATEORDER_MDY;
117int IntervalStyle = INTSTYLE_POSTGRES;
118
119bool enableFsync = true;
120bool allowSystemTableMods = false;
121int work_mem = 1024;
122int maintenance_work_mem = 16384;
123int max_parallel_maintenance_workers = 2;
124
125/*
126 * Primary determinants of sizes of shared-memory structures.
127 *
128 * MaxBackends is computed by PostmasterMain after modules have had a chance to
129 * register background workers.
130 */
131int NBuffers = 1000;
132int MaxConnections = 90;
133int max_worker_processes = 8;
134int max_parallel_workers = 8;
135int MaxBackends = 0;
136
137int VacuumCostPageHit = 1; /* GUC parameters for vacuum */
138int VacuumCostPageMiss = 10;
139int VacuumCostPageDirty = 20;
140int VacuumCostLimit = 200;
141double VacuumCostDelay = 0;
142
143int VacuumPageHit = 0;
144int VacuumPageMiss = 0;
145int VacuumPageDirty = 0;
146
147int VacuumCostBalance = 0; /* working state for vacuum */
148bool VacuumCostActive = false;
149
150double vacuum_cleanup_index_scale_factor;
151