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globals.c
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1 /*-------------------------------------------------------------------------
2  *
3  * globals.c
4  * global variable declarations
5  *
6  * Portions Copyright (c) 1996-2024, 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/procnumber.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 CheckClientConnectionPending = false;
34 volatile sig_atomic_t ClientConnectionLost = false;
35 volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false;
36 volatile sig_atomic_t TransactionTimeoutPending = false;
37 volatile sig_atomic_t IdleSessionTimeoutPending = false;
38 volatile sig_atomic_t ProcSignalBarrierPending = false;
39 volatile sig_atomic_t LogMemoryContextPending = false;
40 volatile sig_atomic_t IdleStatsUpdateTimeoutPending = false;
43 volatile uint32 CritSectionCount = 0;
44 
49 struct Port *MyProcPort;
52 
53 /*
54  * MyLatch points to the latch that should be used for signal handling by the
55  * current process. It will either point to a process local latch if the
56  * current process does not have a PGPROC entry in that moment, or to
57  * PGPROC->procLatch if it has. Thus it can always be used in signal handlers,
58  * without checking for its existence.
59  */
60 struct Latch *MyLatch;
61 
62 /*
63  * DataDir is the absolute path to the top level of the PGDATA directory tree.
64  * Except during early startup, this is also the server's working directory;
65  * most code therefore can simply use relative paths and not reference DataDir
66  * explicitly.
67  */
68 char *DataDir = NULL;
69 
70 /*
71  * Mode of the data directory. The default is 0700 but it may be changed in
72  * checkDataDir() to 0750 if the data directory actually has that mode.
73  */
75 
76 char OutputFileName[MAXPGPATH]; /* debugging output file */
77 
78 char my_exec_path[MAXPGPATH]; /* full path to my executable */
79 char pkglib_path[MAXPGPATH]; /* full path to lib directory */
80 
81 #ifdef EXEC_BACKEND
82 char postgres_exec_path[MAXPGPATH]; /* full path to backend */
83 
84 /* note: currently this is not valid in backend processes */
85 #endif
86 
88 
90 
92 
94 
96 
97 /*
98  * DatabasePath is the path (relative to DataDir) of my database's
99  * primary directory, ie, its directory in the default tablespace.
100  */
101 char *DatabasePath = NULL;
102 
103 pid_t PostmasterPid = 0;
104 
105 /*
106  * IsPostmasterEnvironment is true in a postmaster process and any postmaster
107  * child process; it is false in a standalone process (bootstrap or
108  * standalone backend). IsUnderPostmaster is true in postmaster child
109  * processes. Note that "child process" includes all children, not only
110  * regular backends. These should be set correctly as early as possible
111  * in the execution of a process, so that error handling will do the right
112  * things if an error should occur during process initialization.
113  *
114  * These are initialized for the bootstrap/standalone case.
115  */
117 bool IsUnderPostmaster = false;
118 bool IsBinaryUpgrade = false;
119 
120 bool ExitOnAnyError = false;
121 
125 
126 bool enableFsync = true;
127 bool allowSystemTableMods = false;
128 int work_mem = 4096;
129 double hash_mem_multiplier = 2.0;
132 
133 /*
134  * Primary determinants of sizes of shared-memory structures.
135  *
136  * MaxBackends is computed by PostmasterMain after modules have had a chance to
137  * register background workers.
138  */
139 int NBuffers = 16384;
140 int MaxConnections = 100;
143 int MaxBackends = 0;
144 
145 /* GUC parameters for vacuum */
147 
151 int VacuumCostLimit = 200;
152 double VacuumCostDelay = 0;
153 
154 int64 VacuumPageHit = 0;
155 int64 VacuumPageMiss = 0;
156 int64 VacuumPageDirty = 0;
157 
158 int VacuumCostBalance = 0; /* working state for vacuum */
159 bool VacuumCostActive = false;
160 
161 /* configurable SLRU buffer sizes */
165 int notify_buffers = 16;
unsigned int uint32
Definition: c.h:493
signed int int32
Definition: c.h:481
int64 TimestampTz
Definition: timestamp.h:39
#define PG_DIR_MODE_OWNER
Definition: file_perm.h:32
int multixact_offset_buffers
Definition: globals.c:164
volatile sig_atomic_t IdleStatsUpdateTimeoutPending
Definition: globals.c:40
bool MyDatabaseHasLoginEventTriggers
Definition: globals.c:95
volatile sig_atomic_t LogMemoryContextPending
Definition: globals.c:39
volatile sig_atomic_t ProcSignalBarrierPending
Definition: globals.c:38
ProcNumber ParallelLeaderProcNumber
Definition: globals.c:89
double hash_mem_multiplier
Definition: globals.c:129
struct ClientSocket * MyClientSocket
Definition: globals.c:48
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
int64 VacuumPageHit
Definition: globals.c:154
volatile sig_atomic_t IdleSessionTimeoutPending
Definition: globals.c:37
bool IsBinaryUpgrade
Definition: globals.c:118
int VacuumCostLimit
Definition: globals.c:151
volatile uint32 QueryCancelHoldoffCount
Definition: globals.c:42
int DateStyle
Definition: globals.c:122
int max_parallel_maintenance_workers
Definition: globals.c:131
int32 MyCancelKey
Definition: globals.c:50
int NBuffers
Definition: globals.c:139
int MyPMChildSlot
Definition: globals.c:51
ProtocolVersion FrontendProtocol
Definition: globals.c:28
pid_t PostmasterPid
Definition: globals.c:103
volatile sig_atomic_t IdleInTransactionSessionTimeoutPending
Definition: globals.c:35
volatile uint32 InterruptHoldoffCount
Definition: globals.c:41
volatile sig_atomic_t TransactionTimeoutPending
Definition: globals.c:36
int transaction_buffers
Definition: globals.c:168
int MyProcPid
Definition: globals.c:45
bool enableFsync
Definition: globals.c:126
ProcNumber MyProcNumber
Definition: globals.c:87
int VacuumCostPageMiss
Definition: globals.c:149
int64 VacuumPageMiss
Definition: globals.c:155
char pkglib_path[MAXPGPATH]
Definition: globals.c:79
bool VacuumCostActive
Definition: globals.c:159
bool IsUnderPostmaster
Definition: globals.c:117
int64 VacuumPageDirty
Definition: globals.c:156
int MaxConnections
Definition: globals.c:140
int multixact_member_buffers
Definition: globals.c:163
int data_directory_mode
Definition: globals.c:74
int VacuumCostBalance
Definition: globals.c:158
volatile sig_atomic_t ClientConnectionLost
Definition: globals.c:34
bool allowSystemTableMods
Definition: globals.c:127
int maintenance_work_mem
Definition: globals.c:130
Oid MyDatabaseTableSpace
Definition: globals.c:93
volatile uint32 CritSectionCount
Definition: globals.c:43
int max_parallel_workers
Definition: globals.c:142
int MaxBackends
Definition: globals.c:143
char * DataDir
Definition: globals.c:68
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
int VacuumCostPageDirty
Definition: globals.c:150
TimestampTz MyStartTimestamp
Definition: globals.c:47
bool ExitOnAnyError
Definition: globals.c:120
int IntervalStyle
Definition: globals.c:124
int notify_buffers
Definition: globals.c:165
bool IsPostmasterEnvironment
Definition: globals.c:116
struct Port * MyProcPort
Definition: globals.c:49
int work_mem
Definition: globals.c:128
int VacuumBufferUsageLimit
Definition: globals.c:146
pg_time_t MyStartTime
Definition: globals.c:46
int VacuumCostPageHit
Definition: globals.c:148
struct Latch * MyLatch
Definition: globals.c:60
char OutputFileName[MAXPGPATH]
Definition: globals.c:76
int commit_timestamp_buffers
Definition: globals.c:162
double VacuumCostDelay
Definition: globals.c:152
int subtransaction_buffers
Definition: globals.c:167
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
char * DatabasePath
Definition: globals.c:101
int DateOrder
Definition: globals.c:123
volatile sig_atomic_t CheckClientConnectionPending
Definition: globals.c:33
int max_worker_processes
Definition: globals.c:141
char my_exec_path[MAXPGPATH]
Definition: globals.c:78
Oid MyDatabaseId
Definition: globals.c:91
int serializable_buffers
Definition: globals.c:166
#define USE_ISO_DATES
Definition: miscadmin.h:235
#define DATEORDER_MDY
Definition: miscadmin.h:243
#define INTSTYLE_POSTGRES
Definition: miscadmin.h:255
#define MAXPGPATH
int64 pg_time_t
Definition: pgtime.h:23
#define InvalidOid
Definition: postgres_ext.h:36
unsigned int Oid
Definition: postgres_ext.h:31
uint32 ProtocolVersion
Definition: pqcomm.h:99
#define INVALID_PROC_NUMBER
Definition: procnumber.h:26
int ProcNumber
Definition: procnumber.h:24
Definition: latch.h:113
Definition: libpq-be.h:133