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/*-------------------------------------------------------------------------
*
* globals.c
* global variable declarations
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/init/globals.c
*
* NOTES
* Globals used all over the place should be declared here and not
* in other modules.
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "common/file_perm.h"
#include "libpq/libpq-be.h"
#include "libpq/pqcomm.h"
#include "miscadmin.h"
#include "storage/backendid.h"
ProtocolVersion FrontendProtocol;
volatile sig_atomic_t InterruptPending = false;
volatile sig_atomic_t QueryCancelPending = false;
volatile sig_atomic_t ProcDiePending = false;
volatile sig_atomic_t CheckClientConnectionPending = false;
volatile sig_atomic_t ClientConnectionLost = false;
volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false;
volatile sig_atomic_t IdleSessionTimeoutPending = false;
volatile sig_atomic_t ProcSignalBarrierPending = false;
volatile sig_atomic_t LogMemoryContextPending = false;
volatile uint32 InterruptHoldoffCount = 0;
volatile uint32 QueryCancelHoldoffCount = 0;
volatile uint32 CritSectionCount = 0;
int MyProcPid;
pg_time_t MyStartTime;
TimestampTz MyStartTimestamp;
struct Port *MyProcPort;
int32 MyCancelKey;
int MyPMChildSlot;
/*
* MyLatch points to the latch that should be used for signal handling by the
* current process. It will either point to a process local latch if the
* current process does not have a PGPROC entry in that moment, or to
* PGPROC->procLatch if it has. Thus it can always be used in signal handlers,
* without checking for its existence.
*/
struct Latch *MyLatch;
/*
* DataDir is the absolute path to the top level of the PGDATA directory tree.
* Except during early startup, this is also the server's working directory;
* most code therefore can simply use relative paths and not reference DataDir
* explicitly.
*/
char *DataDir = NULL;
/*
* Mode of the data directory. The default is 0700 but it may be changed in
* checkDataDir() to 0750 if the data directory actually has that mode.
*/
int data_directory_mode = PG_DIR_MODE_OWNER;
char OutputFileName[MAXPGPATH]; /* debugging output file */
char my_exec_path[MAXPGPATH]; /* full path to my executable */
char pkglib_path[MAXPGPATH]; /* full path to lib directory */
#ifdef EXEC_BACKEND
char postgres_exec_path[MAXPGPATH]; /* full path to backend */
/* note: currently this is not valid in backend processes */
#endif
BackendId MyBackendId = InvalidBackendId;
BackendId ParallelLeaderBackendId = InvalidBackendId;
Oid MyDatabaseId = InvalidOid;
Oid MyDatabaseTableSpace = InvalidOid;
/*
* DatabasePath is the path (relative to DataDir) of my database's
* primary directory, ie, its directory in the default tablespace.
*/
char *DatabasePath = NULL;
pid_t PostmasterPid = 0;
/*
* IsPostmasterEnvironment is true in a postmaster process and any postmaster
* child process; it is false in a standalone process (bootstrap or
* standalone backend). IsUnderPostmaster is true in postmaster child
* processes. Note that "child process" includes all children, not only
* regular backends. These should be set correctly as early as possible
* in the execution of a process, so that error handling will do the right
* things if an error should occur during process initialization.
*
* These are initialized for the bootstrap/standalone case.
*/
bool IsPostmasterEnvironment = false;
bool IsUnderPostmaster = false;
bool IsBinaryUpgrade = false;
bool IsBackgroundWorker = false;
bool ExitOnAnyError = false;
int DateStyle = USE_ISO_DATES;
int DateOrder = DATEORDER_MDY;
int IntervalStyle = INTSTYLE_POSTGRES;
bool enableFsync = true;
bool allowSystemTableMods = false;
int work_mem = 4096;
double hash_mem_multiplier = 1.0;
int maintenance_work_mem = 65536;
int max_parallel_maintenance_workers = 2;
/*
* Primary determinants of sizes of shared-memory structures.
*
* MaxBackends is computed by PostmasterMain after modules have had a chance to
* register background workers.
*/
int NBuffers = 1000;
int MaxConnections = 90;
int max_worker_processes = 8;
int max_parallel_workers = 8;
int MaxBackends = 0;
int VacuumCostPageHit = 1; /* GUC parameters for vacuum */
int VacuumCostPageMiss = 2;
int VacuumCostPageDirty = 20;
int VacuumCostLimit = 200;
double VacuumCostDelay = 0;
int64 VacuumPageHit = 0;
int64 VacuumPageMiss = 0;
int64 VacuumPageDirty = 0;
int VacuumCostBalance = 0; /* working state for vacuum */
bool VacuumCostActive = false;
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