src_backend_utils_init_globals.c

/*--------------------------------------------------------------------
 * Symbols referenced in this file:
 * - CritSectionCount
 * - ExitOnAnyError
 * - InterruptHoldoffCount
 * - QueryCancelHoldoffCount
 * - IsPostmasterEnvironment
 * - InterruptPending
 *--------------------------------------------------------------------
 */

/*-------------------------------------------------------------------------
 *
 * globals.c
 *	  global variable declarations
 *
 * Portions Copyright (c) 1996-2015, 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 "libpq/libpq-be.h"
#include "libpq/pqcomm.h"
#include "miscadmin.h"
#include "storage/backendid.h"




__thread volatile bool InterruptPending = false;




__thread volatile uint32 InterruptHoldoffCount = 0;

__thread volatile uint32 QueryCancelHoldoffCount = 0;

__thread volatile uint32 CritSectionCount = 0;








/*
 * 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.
 */


/*
 * 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.
 */


	/* debugging output file */

	/* full path to my executable */
		/* 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







/*
 * DatabasePath is the path (relative to DataDir) of my database's
 * primary directory, ie, its directory in the default tablespace.
 */




/*
 * 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.
 */
__thread bool		IsPostmasterEnvironment = false;





__thread bool		ExitOnAnyError = false;











/*
 * Primary determinants of sizes of shared-memory structures.
 *
 * MaxBackends is computed by PostmasterMain after modules have had a chance to
 * register background workers.
 */





		/* GUC parameters for vacuum */









		/* working state for vacuum */