src/backend/utils/init/globals.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * globals.c
   4  *        global variable declarations
   5  *
   6  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  *
  10  * IDENTIFICATION
  11  *        $PostgreSQL$
  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 "libpq/pqcomm.h"
  22 #include "miscadmin.h"
  23 #include "storage/backendid.h"
  24
  25
  26 ProtocolVersion FrontendProtocol = PG_PROTOCOL_LATEST;
  27
  28 volatile bool InterruptPending = false;
  29 volatile bool QueryCancelPending = false;
  30 volatile bool ProcDiePending = false;
  31 volatile bool ImmediateInterruptOK = false;
  32 volatile uint32 InterruptHoldoffCount = 0;
  33 volatile uint32 CritSectionCount = 0;
  34
  35 int                     MyProcPid;
  36 pg_time_t       MyStartTime;
  37 struct Port *MyProcPort;
  38 long            MyCancelKey;
  39 int                     MyPMChildSlot;
  40
  41 /*
  42  * DataDir is the absolute path to the top level of the PGDATA directory tree.
  43  * Except during early startup, this is also the server's working directory;
  44  * most code therefore can simply use relative paths and not reference DataDir
  45  * explicitly.
  46  */
  47 char       *DataDir = NULL;
  48
  49 char            OutputFileName[MAXPGPATH];      /* debugging output file */
  50
  51 char            my_exec_path[MAXPGPATH];        /* full path to my executable */
  52 char            pkglib_path[MAXPGPATH];         /* full path to lib directory */
  53
  54 #ifdef EXEC_BACKEND
  55 char            postgres_exec_path[MAXPGPATH];          /* full path to backend */
  56
  57 /* note: currently this is not valid in backend processes */
  58 #endif
  59
  60 BackendId       MyBackendId = InvalidBackendId;
  61
  62 Oid                     MyDatabaseId = InvalidOid;
  63
  64 Oid                     MyDatabaseTableSpace = InvalidOid;
  65
  66 /*
  67  * DatabasePath is the path (relative to DataDir) of my database's
  68  * primary directory, ie, its directory in the default tablespace.
  69  */
  70 char       *DatabasePath = NULL;
  71
  72 pid_t           PostmasterPid = 0;
  73
  74 /*
  75  * IsPostmasterEnvironment is true in a postmaster process and any postmaster
  76  * child process; it is false in a standalone process (bootstrap or
  77  * standalone backend).  IsUnderPostmaster is true in postmaster child
  78  * processes.  Note that "child process" includes all children, not only
  79  * regular backends.  These should be set correctly as early as possible
  80  * in the execution of a process, so that error handling will do the right
  81  * things if an error should occur during process initialization.
  82  *
  83  * These are initialized for the bootstrap/standalone case.
  84  */
  85 bool            IsPostmasterEnvironment = false;
  86 bool            IsUnderPostmaster = false;
  87
  88 bool            ExitOnAnyError = false;
  89
  90 int                     DateStyle = USE_ISO_DATES;
  91 int                     DateOrder = DATEORDER_MDY;
  92 int                     IntervalStyle = INTSTYLE_POSTGRES;
  93 bool            HasCTZSet = false;
  94 int                     CTimeZone = 0;
  95
  96 bool            enableFsync = true;
  97 bool            allowSystemTableMods = false;
  98 int                     work_mem = 1024;
  99 int                     maintenance_work_mem = 16384;
 100
 101 /*
 102  * Primary determinants of sizes of shared-memory structures.  MaxBackends is
 103  * MaxConnections + autovacuum_max_workers (it is computed by the GUC assign
 104  * hook):
 105  */
 106 int                     NBuffers = 1000;
 107 int                     MaxBackends = 100;
 108 int                     MaxConnections = 90;
 109
 110 int                     VacuumCostPageHit = 1;          /* GUC parameters for vacuum */
 111 int                     VacuumCostPageMiss = 10;
 112 int                     VacuumCostPageDirty = 20;
 113 int                     VacuumCostLimit = 200;
 114 int                     VacuumCostDelay = 0;
 115
 116 int                     VacuumCostBalance = 0;          /* working state for vacuum */
 117 bool            VacuumCostActive = false;
 118
 119 int                     GinFuzzySearchLimit = 0;