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globals.c
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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 
29 
30 volatile sig_atomic_t InterruptPending = false;
31 volatile sig_atomic_t QueryCancelPending = false;
32 volatile sig_atomic_t ProcDiePending = false;
33 volatile sig_atomic_t ClientConnectionLost = false;
34 volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false;
35 volatile sig_atomic_t ConfigReloadPending = false;
38 volatile uint32 CritSectionCount = 0;
39 
43 struct Port *MyProcPort;
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  */
54 struct 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  */
62 char *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  */
69 
70 char OutputFileName[MAXPGPATH]; /* debugging output file */
71 
72 char my_exec_path[MAXPGPATH]; /* full path to my executable */
73 char pkglib_path[MAXPGPATH]; /* full path to lib directory */
74 
75 #ifdef EXEC_BACKEND
76 char postgres_exec_path[MAXPGPATH]; /* full path to backend */
77 
78 /* note: currently this is not valid in backend processes */
79 #endif
80 
82 
84 
86 
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  */
93 char *DatabasePath = NULL;
94 
95 pid_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  */
109 bool IsUnderPostmaster = false;
110 bool IsBinaryUpgrade = false;
111 bool IsBackgroundWorker = false;
112 
113 bool ExitOnAnyError = false;
114 
118 
119 bool enableFsync = true;
120 bool allowSystemTableMods = false;
121 int work_mem = 1024;
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  */
131 int NBuffers = 1000;
132 int MaxConnections = 90;
135 int MaxBackends = 0;
136 
137 int VacuumCostPageHit = 1; /* GUC parameters for vacuum */
140 int VacuumCostLimit = 200;
141 double VacuumCostDelay = 0;
142 
146 
147 int VacuumCostBalance = 0; /* working state for vacuum */
148 bool VacuumCostActive = false;
149 
int max_parallel_workers
Definition: globals.c:134
bool IsPostmasterEnvironment
Definition: globals.c:108
volatile uint32 InterruptHoldoffCount
Definition: globals.c:36
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
int MyProcPid
Definition: globals.c:40
BackendId MyBackendId
Definition: globals.c:81
int64 pg_time_t
Definition: pgtime.h:23
int VacuumCostBalance
Definition: globals.c:147
struct Port * MyProcPort
Definition: globals.c:43
#define PG_DIR_MODE_OWNER
Definition: file_perm.h:32
int64 TimestampTz
Definition: timestamp.h:39
int VacuumPageHit
Definition: globals.c:143
pg_time_t MyStartTime
Definition: globals.c:41
volatile uint32 QueryCancelHoldoffCount
Definition: globals.c:37
Definition: libpq-be.h:120
double vacuum_cleanup_index_scale_factor
Definition: globals.c:150
int IntervalStyle
Definition: globals.c:117
unsigned int Oid
Definition: postgres_ext.h:31
int VacuumCostPageDirty
Definition: globals.c:139
bool IsBinaryUpgrade
Definition: globals.c:110
signed int int32
Definition: c.h:347
Oid MyDatabaseTableSpace
Definition: globals.c:87
#define USE_ISO_DATES
Definition: miscadmin.h:214
bool IsBackgroundWorker
Definition: globals.c:111
int VacuumCostLimit
Definition: globals.c:140
int32 MyCancelKey
Definition: globals.c:44
#define MAXPGPATH
int MaxBackends
Definition: globals.c:135
Definition: latch.h:110
char OutputFileName[MAXPGPATH]
Definition: globals.c:70
bool IsUnderPostmaster
Definition: globals.c:109
volatile sig_atomic_t ClientConnectionLost
Definition: globals.c:33
unsigned int uint32
Definition: c.h:359
volatile uint32 CritSectionCount
Definition: globals.c:38
volatile sig_atomic_t IdleInTransactionSessionTimeoutPending
Definition: globals.c:34
int VacuumCostPageHit
Definition: globals.c:137
int DateOrder
Definition: globals.c:116
volatile sig_atomic_t ConfigReloadPending
Definition: globals.c:35
pid_t PostmasterPid
Definition: globals.c:95
uint32 ProtocolVersion
Definition: pqcomm.h:113
bool ExitOnAnyError
Definition: globals.c:113
char my_exec_path[MAXPGPATH]
Definition: globals.c:72
int VacuumPageDirty
Definition: globals.c:145
#define InvalidBackendId
Definition: backendid.h:23
TimestampTz MyStartTimestamp
Definition: globals.c:42
int BackendId
Definition: backendid.h:21
Oid MyDatabaseId
Definition: globals.c:85
int MaxConnections
Definition: globals.c:132
int max_parallel_maintenance_workers
Definition: globals.c:123
int work_mem
Definition: globals.c:121
bool allowSystemTableMods
Definition: globals.c:120
#define InvalidOid
Definition: postgres_ext.h:36
int maintenance_work_mem
Definition: globals.c:122
#define DATEORDER_MDY
Definition: miscadmin.h:222
char * DatabasePath
Definition: globals.c:93
BackendId ParallelMasterBackendId
Definition: globals.c:83
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
int DateStyle
Definition: globals.c:115
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
bool enableFsync
Definition: globals.c:119
int MyPMChildSlot
Definition: globals.c:45
int data_directory_mode
Definition: globals.c:68
double VacuumCostDelay
Definition: globals.c:141
int NBuffers
Definition: globals.c:131
char * DataDir
Definition: globals.c:62
int max_worker_processes
Definition: globals.c:133
struct Latch * MyLatch
Definition: globals.c:54
int VacuumPageMiss
Definition: globals.c:144
int VacuumCostPageMiss
Definition: globals.c:138
ProtocolVersion FrontendProtocol
Definition: globals.c:28
char pkglib_path[MAXPGPATH]
Definition: globals.c:73
bool VacuumCostActive
Definition: globals.c:148
#define INTSTYLE_POSTGRES
Definition: miscadmin.h:234