/*
 *      PROGRAM:        JRD access method
 *      MODULE:         jrd.h
 *      DESCRIPTION:    Common descriptions
 *
 * The contents of this file are subject to the Interbase Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy
 * of the License at http://www.Inprise.com/IPL.html
 *
 * Software distributed under the License is distributed on an
 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code was created by Inprise Corporation
 * and its predecessors. Portions created by Inprise Corporation are
 * Copyright (C) Inprise Corporation.
 *
 * All Rights Reserved.
 * Contributor(s): ______________________________________.
 *
 * 2002.10.28 Sean Leyne - Code cleanup, removed obsolete "DecOSF" port
 *
 * 2002.10.29 Sean Leyne - Removed obsolete "Netware" port
 *
 */

#ifndef JRD_JRD_H
#define JRD_JRD_H

#include "../jrd/gdsassert.h"
#include "../jrd/common.h"
#include "../jrd/dsc.h"
#include "../jrd/all.h"
#include "../jrd/btn.h"
#include "../jrd/all.h"
#include "../jrd/jrd_proto.h"
#if defined(UNIX) && defined(SUPERSERVER)
#include <setjmp.h>
#endif

#include "../common/classes/fb_string.h"
#include "../common/classes/MetaName.h"
#include "../common/classes/array.h"
#include "../common/classes/objects_array.h"
#include "../common/classes/stack.h"
#include "../common/classes/timestamp.h"
#include "../common/classes/GenericMap.h"
#include "../jrd/os/guid.h"
#include "../jrd/sbm.h"

#ifdef DEV_BUILD
#define DEBUG                   if (debug) DBG_supervisor(debug);
//#define VIO_DEBUG				// remove this for production build
#else // PROD
#define DEBUG
#undef VIO_DEBUG
#endif

#define BUGCHECK(number)        ERR_bugcheck (number, __FILE__, __LINE__)
#define CORRUPT(number)         ERR_corrupt (number)
#define IBERROR(number)         ERR_error (number)


#define BLKCHK(blk, type)       if (MemoryPool::blk_type(blk) != (USHORT) (type)) BUGCHECK (147)

/* DEV_BLKCHK is used for internal consistency checking - where
 * the performance hit in production build isn't desired.
 * (eg: scatter this everywhere)
 *
 * This causes me a problem DEV_BLKCHK fails when the data seems valid
 * After talking to John this could be because the memory is from the local
 * stack rather than the heap.  However I found to continue I needed to 
 * turn it off by dfining the macro to be empty.  But In thinking about
 * it I think that it would be more helful for a mode where these extra 
 * DEV checks just gave warnings rather than being fatal.
 * MOD 29-July-2002
 *
 */
#ifdef DEV_BUILD
#define DEV_BLKCHK(blk,type)
//#define DEV_BLKCHK(blk, type)    if (blk) {BLKCHK (blk, type);}
#else
#define DEV_BLKCHK(blk, type)	// nothing
#endif


// Thread data block / IPC related data blocks
#include "../jrd/thd.h"
#include "../jrd/isc.h"

// Definition of block types for data allocation in JRD
#include "../jrd/jrd_blks.h"
#include "../include/fb_blk.h"

#include "../jrd/blb.h"

// Definition of DatabasePlugins
#include "../jrd/flu.h"

#include "../jrd/pag.h"

#include "../jrd/RuntimeStatistics.h"

class str;
class CharSetContainer;
struct dsc;
struct thread;
struct mod;

namespace Jrd {

const int HASH_SIZE = 509;

// fwd. decl.
//class vec;
template <typename T> class vec;
class thread_db;
class Attachment;
class jrd_tra;
class jrd_req;
class Lock;
class jrd_file;
class Format;
class jrd_nod;
class BufferControl;
class BackupManager;
class SparseBitmap;
class BlockingThread;
class jrd_rel;
class ExternalFile;
class ViewContext;
class IndexBlock;
class IndexLock;
class ArrayField;
class BlobFilter;
class PageControl;
class Symbol;
class UserId;
struct sort_context;
class TxPageCache;
class RecordSelExpr;
class SecurityClass;
class vcl;
class Shadow;
class TextType;
class jrd_prc;
class Parameter;
class jrd_fld;

// The database block, the topmost block in the metadata
// cache for a database

// Relation trigger definition

class Trigger {
public:
	Firebird::HalfStaticArray<UCHAR, 128> blr;	// BLR code
	bid			dbg_blob_id;					// RDB$DEBUG_INFO 
	jrd_req*	request;					// Compiled request. Gets filled on first invocation
	bool		compile_in_progress;
	bool		sys_trigger;
	UCHAR		type;						// Trigger type
	USHORT		flags;						// Flags as they are in RDB$TRIGGERS table
	jrd_rel*	relation;					// Trigger parent relation
	Firebird::MetaName	name;				// Trigger name
	void compile(thread_db*);				// Ensure that trigger is compiled
	void release(thread_db*);				// Try to free trigger request

	explicit Trigger(MemoryPool& p) : blr(p), name(p) 
	{ dbg_blob_id.clear(); }
};

typedef Firebird::ObjectsArray<Trigger> trig_vec;


class Database : private pool_alloc<type_dbb>
{
public:
	typedef int (*crypt_routine) (const char*, void*, int, void*);

	static Database* newDbb(MemoryPool& p) {
		return FB_NEW(p) Database(p);
	}
	
	// The deleteDbb function MUST be used to delete a Database object.
	// The function hides some tricky order of operations.  Since the
	// memory for the vectors in the Database is allocated out of the Database's
	// permanent memory pool, the entire delete() operation needs
	// to complete _before_ the permanent pool is deleted, or else
	// risk an aborted engine.
	static void deleteDbb(Database* toDelete)
	{
		if (toDelete == 0)
			return;
		JrdMemoryPool *perm = toDelete->dbb_permanent;
#ifdef SUPERSERVER
		// Memory pool destruction below decrements memory statistics for 
		// SuperServer situated in database block we are about to deallocate
		// right now.
		Firebird::MemoryStats temp_stats;
		perm->setStatsGroup(temp_stats);
#endif
		delete toDelete;
		JrdMemoryPool::noDbbDeletePool(perm);
	}
	
	Database*	dbb_next;				// Next database block in system
	Attachment* dbb_attachments;		// Active attachments
	BufferControl*	dbb_bcb;			// Buffer control block
	vec<jrd_rel*>*	dbb_relations;		// relation vector
	vec<jrd_prc*>*	dbb_procedures;		// scanned procedures
	FB_GUID		dbb_guid;				// dbb instance identifier
	Lock*		dbb_instance_lock;		// dbb instance lock
	Lock* 		dbb_lock;				// granddaddy lock
	jrd_tra*	dbb_sys_trans;			// system transaction
//	jrd_file*	dbb_file;				// files for I/O operations
	Shadow*		dbb_shadow;				// shadow control block
	Lock*		dbb_shadow_lock;		// lock for synchronizing addition of shadows
	//SLONG dbb_shadow_sync_count;		// to synchronize changes to shadows
	Lock*		dbb_retaining_lock;		// lock for preserving commit retaining snapshot
	Lock*		dbb_increment_lock;		// lock used as an internal id generator
	Lock*		dbb_monitor_lock;		// lock for monitoring purposes
	PageManager dbb_page_manager;
	vcl*		dbb_t_pages;			// pages number for transactions
	vcl*		dbb_gen_id_pages;		// known pages for gen_id
	BlobFilter*	dbb_blob_filters;		// known blob filters
	trig_vec*	dbb_triggers[DB_TRIGGER_MAX];

	DatabaseModules	modules;			// external function/filter modules
	Firebird::Mutex* dbb_mutexes;		// Database block mutexes
	REC_MUTX_T dbb_sp_rec_mutex;		// Recursive mutex for accessing/updating stored procedure metadata
	//SLONG dbb_sort_size;				// Size of sort space per sort, unused for now

	UATOM dbb_ast_flags;				// flags modified at AST level
	ULONG dbb_flags;
	USHORT dbb_ods_version;				// major ODS version number
	USHORT dbb_minor_version;			// minor ODS version number
	USHORT dbb_minor_original;			// minor ODS version at creation
	USHORT dbb_page_size;				// page size
	USHORT dbb_dp_per_pp;				// data pages per pointer page
	USHORT dbb_max_records;				// max record per data page
	USHORT dbb_max_idx;					// max number of indexes on a root page
	USHORT dbb_use_count;				// active count of threads
	USHORT dbb_shutdown_delay;			// seconds until forced shutdown.
										// Set in shut.cpp but not tested yet.
#ifdef SUPERSERVER_V2
	USHORT dbb_prefetch_sequence;		// sequence to pace frequency of prefetch requests
	USHORT dbb_prefetch_pages;			// prefetch pages per request
#endif
	Firebird::PathName dbb_filename;	// filename string
	Firebird::PathName dbb_database_name;	// database ID (file name or alias)
	Firebird::string dbb_encrypt_key;	// encryption key

	JrdMemoryPool* dbb_permanent;
	JrdMemoryPool* dbb_bufferpool;

	typedef JrdMemoryPool* pool_ptr;
	typedef Firebird::Array<pool_ptr> pool_vec_type;

	pool_vec_type dbb_pools;			// pools

	vec<jrd_req*>*	dbb_internal;		// internal requests
	vec<jrd_req*>*	dbb_dyn_req;		// internal dyn requests

	SLONG dbb_oldest_active;			// Cached "oldest active" transaction
	SLONG dbb_oldest_transaction;		// Cached "oldest interesting" transaction
	SLONG dbb_oldest_snapshot;			// Cached "oldest snapshot" of all active transactions
	SLONG dbb_next_transaction;			// Next transaction id used by NETWARE
	SLONG dbb_attachment_id;			// Next attachment id for ReadOnly DB's
	SLONG dbb_page_incarnation;			// Cache page incarnation counter
	ULONG dbb_page_buffers;				// Page buffers from header page

	event_t dbb_writer_event[1];		// Event to wake up cache writer
	event_t dbb_writer_event_init[1];	// Event for initialization cache writer
	event_t dbb_writer_event_fini[1];	// Event for finalization cache writer
#ifdef SUPERSERVER_V2
	event_t dbb_reader_event[1];		// Event to wake up cache reader
#endif

#ifdef GARBAGE_THREAD
	event_t dbb_gc_event[1];			// Event to wake up garbage collector
	event_t dbb_gc_event_init[1];		// Event for initialization garbage collector
	event_t dbb_gc_event_fini[1];		// Event for finalization garbage collector
#endif

	BlockingThread*	dbb_free_btbs;		// Unused BlockingThread blocks

	Firebird::MemoryStats dbb_memory_stats;

	SLONG dbb_reads;
	SLONG dbb_writes;
	SLONG dbb_fetches;
	SLONG dbb_marks;
	RuntimeStatistics dbb_stats;
	SLONG dbb_last_header_write;		// Transaction id of last header page physical write
	SLONG dbb_flush_cycle;				// Current flush cycle
	SLONG dbb_sweep_interval;			// Transactions between sweep
	SLONG dbb_lock_owner_handle;		// Handle for the lock manager

	USHORT unflushed_writes;			// unflushed writes
	time_t last_flushed_write;			// last flushed write time

	crypt_routine dbb_encrypt;			// External encryption routine
	crypt_routine dbb_decrypt;			// External decryption routine

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	class blb_map *dbb_blob_map;		// mapping of blobs for REPLAY
	struct log *dbb_log;				// log file for REPLAY
#endif

	Firebird::Array<CharSetContainer*>		dbb_charsets;	// intl character set descriptions
	TxPageCache*	dbb_tip_cache;		// cache of latest known state of all transactions in system
	vcl*		dbb_pc_transactions;	// active precommitted transactions
	BackupManager *dbb_backup_manager;	// physical backup manager
	Firebird::TimeStamp dbb_creation_date; // creation date
	Symbol*	dbb_hash_table[HASH_SIZE];	// keep this at the end

private:
	explicit Database(MemoryPool& p)
	:	dbb_page_manager(p),
		modules(p),
		dbb_filename(p),
		dbb_database_name(p),
		dbb_encrypt_key(p),
		dbb_pools(p, 4),
		dbb_stats(p),
		dbb_charsets(p)
	{
		dbb_pools.resize(1);
	}

	~Database()
	{
		destroyIntlObjects();

		pool_ptr* itr = dbb_pools.begin();
		while (itr != dbb_pools.end())
		{
			if (*itr && *itr == dbb_bufferpool)
				dbb_bufferpool = 0;
			if (*itr && *itr != dbb_permanent)
				itr = JrdMemoryPool::deletePool(*itr);
			else
				++itr;
		}
		if (dbb_bufferpool)
			JrdMemoryPool::deletePool(dbb_bufferpool);
	}

	// temporal measure to avoid unstable state of lock file -
	// this is anyway called in ~Database(), and in theory should be private
public:
	void destroyIntlObjects();			// defined in intl.cpp
private:

	// The delete operators are no-oped because the Database memory is allocated from the
	// Database's own permanent pool.  That pool has already been released by the Database
	// destructor, so the memory has already been released.  Hence the operator
	// delete no-op.
	void operator delete(void *mem) {}
	void operator delete[](void *mem) {}

	Database(const Database&);			// no impl.
	const Database& operator =(const Database&) { return *this; }
};

//
// bit values for dbb_flags
//
//const ULONG DBB_no_garbage_collect	= 0x1L; // Obsolete.
const ULONG DBB_damaged				= 0x2L;
const ULONG DBB_exclusive			= 0x4L;		// Database is accessed in exclusive mode
const ULONG DBB_bugcheck			= 0x8L;		// Bugcheck has occurred
#ifdef GARBAGE_THREAD
const ULONG DBB_garbage_collector	= 0x10L;	// garbage collector thread exists
const ULONG DBB_gc_active			= 0x20L;	// ... and is actively working.
const ULONG DBB_gc_pending			= 0x40L;	// garbage collection requested
#endif
const ULONG DBB_force_write			= 0x80L;	// Database is forced write
const ULONG DBB_no_reserve			= 0x100L;	// No reserve space for versions
const ULONG DBB_no_fs_cache			= 0x200L;	// Not using file system cache
//const ULONG DBB_add_log				= 0x200L;	// write ahead log has been added
//const ULONG DBB_delete_log			= 0x400L;	// write ahead log has been deleted
//const ULONG DBB_cache_manager		= 0x800L;	// Shared cache manager
const ULONG DBB_DB_SQL_dialect_3	= 0x1000L;	// database SQL dialect 3
const ULONG DBB_read_only			= 0x2000L;	// DB is ReadOnly (RO). If not set, DB is RW
const ULONG DBB_being_opened_read_only	= 0x4000L;	// DB is being opened RO. If unset, opened as RW
const ULONG DBB_not_in_use			= 0x8000L;	// Database to be ignored while attaching
const ULONG DBB_lck_init_done		= 0x10000L;	// LCK_init() called for the database
const ULONG DBB_sp_rec_mutex_init	= 0x20000L;	// Stored procedure mutex initialized
const ULONG DBB_sweep_in_progress	= 0x40000L;	// A database sweep operation is in progress
const ULONG DBB_security_db			= 0x80000L;	// ISC security database
//const ULONG DBB_sweep_thread_started	= 0x100000L;	// A database sweep thread has been started
const ULONG DBB_suspend_bgio		= 0x200000L;	// Suspend I/O by background threads
const ULONG DBB_being_opened		= 0x400000L;	// database is being attached to
const ULONG DBB_gc_cooperative		= 0x0800000L;	// cooperative garbage collection
const ULONG DBB_gc_background		= 0x1000000L;	// background garbage collection by gc_thread
#if (defined DEV_BUILD && !defined MULTI_THREAD)
const ULONG DBB_exec_statement		= 0x2000000L;	// execute statement runs against database
#endif
//
// dbb_ast_flags
//
const UATOM DBB_blocking			= 0x1L;		// Exclusive mode is blocking
const UATOM DBB_get_shadows			= 0x2L;		// Signal received to check for new shadows
const UATOM DBB_assert_locks		= 0x4L;		// Locks are to be asserted
const UATOM DBB_shutdown			= 0x8L;		// Database is shutdown
const UATOM DBB_shut_attach			= 0x10L;	// no new attachments accepted
const UATOM DBB_shut_tran			= 0x20L;	// no new transactions accepted
const UATOM DBB_shut_force			= 0x40L;	// forced shutdown in progress
const UATOM DBB_shutdown_locks		= 0x80L;	// Database locks release by shutdown
const UATOM DBB_shutdown_full		= 0x100L;	// Database fully shut down
const UATOM DBB_shutdown_single		= 0x200L;	// Database is in single-user maintenance mode
const UATOM DBB_monitor_off			= 0x400L;	// Database has the monitoring lock released

//
// Database attachments
//
const int DBB_read_seq_count		= 0;
const int DBB_read_idx_count		= 1;
const int DBB_update_count			= 2;
const int DBB_insert_count			= 3;
const int DBB_delete_count			= 4;
const int DBB_backout_count			= 5;
const int DBB_purge_count			= 6;
const int DBB_expunge_count			= 7;
const int DBB_max_count				= 8;

//
// Database mutexes
//
const int DBB_MUTX_init_fini		= 0;	// During startup and shutdown
//const int DBB_MUTX_statistics		= 1;	// Memory size and counts
//const int DBB_MUTX_replay			= 2;	// Replay logging
const int DBB_MUTX_dyn				= 3;	// Dynamic ddl
//const int DBB_MUTX_cache			= 4;	// Process-private cache management
const int DBB_MUTX_clone			= 5;	// Request cloning
const int DBB_MUTX_cmp_clone		= 6;	// Compiled request cloning
const int DBB_MUTX_flush_count		= 7;	// flush count/time
const int DBB_MUTX_max				= 8;

//
// Flags to indicate normal internal requests vs. dyn internal requests
//
const int IRQ_REQUESTS				= 1;
const int DYN_REQUESTS				= 2;


//
// Errors during validation - will be returned on info calls
// CVC: It seems they will be better in a header for val.cpp that's not val.h
//
const int VAL_PAG_WRONG_TYPE			= 0;
const int VAL_PAG_CHECKSUM_ERR			= 1;
const int VAL_PAG_DOUBLE_ALLOC			= 2;
const int VAL_PAG_IN_USE				= 3;
const int VAL_PAG_ORPHAN				= 4;
const int VAL_BLOB_INCONSISTENT			= 5;
const int VAL_BLOB_CORRUPT				= 6;
const int VAL_BLOB_TRUNCATED			= 7;
const int VAL_REC_CHAIN_BROKEN			= 8;
const int VAL_DATA_PAGE_CONFUSED		= 9;
const int VAL_DATA_PAGE_LINE_ERR		= 10;
const int VAL_INDEX_PAGE_CORRUPT		= 11;
const int VAL_P_PAGE_LOST				= 12;
const int VAL_P_PAGE_INCONSISTENT		= 13;
const int VAL_REC_DAMAGED				= 14;
const int VAL_REC_BAD_TID				= 15;
const int VAL_REC_FRAGMENT_CORRUPT		= 16;
const int VAL_REC_WRONG_LENGTH			= 17;
const int VAL_INDEX_ROOT_MISSING		= 18;
const int VAL_TIP_LOST					= 19;
const int VAL_TIP_LOST_SEQUENCE			= 20;
const int VAL_TIP_CONFUSED				= 21;
const int VAL_REL_CHAIN_ORPHANS			= 22;
const int VAL_INDEX_MISSING_ROWS		= 23;
const int VAL_INDEX_ORPHAN_CHILD		= 24;
const int VAL_INDEX_CYCLE				= 25;
const int VAL_MAX_ERROR					= 26;


#ifndef SUPERSERVER
struct DSqlCacheItem
{
	Lock* lock;
	bool locked;
	bool obsolete;
};
#endif


//
// the attachment block; one is created for each attachment to a database
//
class Attachment : public pool_alloc<type_att>
{
public:
	explicit Attachment(Database* dbb) :
		att_database(dbb), 
		att_stats(*dbb->dbb_permanent, &dbb->dbb_stats),
		att_lc_messages(*dbb->dbb_permanent),
		att_working_directory(*dbb->dbb_permanent), 
		att_filename(*dbb->dbb_permanent),
		att_context_vars(*dbb->dbb_permanent),
		att_network_protocol(*dbb->dbb_permanent),
		att_remote_address(*dbb->dbb_permanent),
		att_remote_process(*dbb->dbb_permanent)
#ifndef SUPERSERVER
		, att_dsql_cache(*dbb->dbb_permanent)
#endif
		{
		}

	~Attachment();

/*	Attachment()
	:	att_database(0),
		att_next(0),
		att_blocking(0),
		att_user(0),
		att_transactions(0),
		att_dbkey_trans(0),
		att_requests(0),
		att_active_sorts(0),
		att_id_lock(0),
		att_attachment_id(0),
		att_lock_owner_handle(0),
		att_event_session(0),
		att_security_class(0),
		att_security_classes(0),
		att_flags(0),
		att_charset(0),
		att_lc_messages(0),
		att_long_locks(0),
		att_compatibility_table(0),
		att_val_errors(0),
		att_working_directory(0)
	{
		att_counts[0] = 0;
	}*/

	Database*	att_database;				// Parent databasea block
	Attachment*	att_next;					// Next attachment to database
	Attachment*	att_blocking;				// Blocking attachment, if any
	UserId*		att_user;					// User identification
	jrd_tra*	att_transactions;			// Transactions belonging to attachment
	jrd_tra*	att_dbkey_trans;			// transaction to control db-key scope
	jrd_req*	att_requests;				// Requests belonging to attachment
	sort_context*	att_active_sorts;		// Active sorts
	Lock*		att_id_lock;				// Attachment lock (if any)
	SLONG		att_attachment_id;			// Attachment ID
	SLONG		att_lock_owner_handle;		// Handle for the lock manager
	SLONG		att_event_session;			// Event session id, if any
	SecurityClass*	att_security_class;		// security class for database
	SecurityClass*	att_security_classes;	// security classes
	vcl*		att_counts[DBB_max_count];
	RuntimeStatistics	att_stats;
	ULONG		att_flags;					// Flags describing the state of the attachment
	SSHORT		att_charset;				// user's charset specified in dpb
	// The following data member is set but never used, so the DPB to set the location of a
	// customized firebird.msg file doesn't work; the only way is to use an env var.
	Firebird::PathName	att_lc_messages;	// attachment's preference for message natural language
	Lock*		att_long_locks;				// outstanding two phased locks
	vec<Lock*>*	att_compatibility_table;	// hash table of compatible locks
	vcl*		att_val_errors;
	Firebird::PathName	att_working_directory;	// Current working directory is cached
	Firebird::PathName	att_filename;			// alias used to attach the database
	Firebird::TimeStamp	att_timestamp;		// Connection date and time
	Firebird::StringMap att_context_vars;	// Context variables for the connection
	Firebird::string att_network_protocol;	// Network protocol used by client for connection
	Firebird::string att_remote_address;	// Protocol-specific addess of remote client
	SLONG att_remote_pid;					// Process id of remote client
	Firebird::PathName att_remote_process;	// Process name of remote client
#ifndef SUPERSERVER
	Lock*		att_temp_pg_lock;			// temporary pagespace ID lock
	Firebird::GenericMap<Firebird::Pair<Firebird::Left<
		Firebird::string, DSqlCacheItem> > > att_dsql_cache;	// DSQL cache locks
#endif

	bool locksmith() const;
};


// Attachment flags

const ULONG ATT_no_cleanup			= 1;	// Don't expunge, purge, or garbage collect
const ULONG ATT_shutdown			= 2;	// attachment has been shutdown
//const ULONG ATT_shutdown_notify		= 4;	// attachment has notified client of shutdown
const ULONG ATT_shutdown_manager	= 8;	// attachment requesting shutdown
const ULONG ATT_lck_init_done		= 16;	// LCK_init() called for the attachment
const ULONG ATT_exclusive			= 32;	// attachment wants exclusive database access
const ULONG ATT_attach_pending		= 64;	// Indicate attachment is only pending
const ULONG ATT_exclusive_pending	= 128;	// Indicate exclusive attachment pending
const ULONG ATT_gbak_attachment		= 256;	// Indicate GBAK attachment
#ifdef GOVERNOR
const ULONG ATT_security_db			= 512;	// Indicates an implicit attachment to the security db
#endif

#ifdef GARBAGE_THREAD
const ULONG ATT_notify_gc			= 1024;	// Notify garbage collector to expunge, purge ..
const ULONG ATT_disable_notify_gc	= 2048;	// Temporarily perform own garbage collection
const ULONG ATT_garbage_collector	= 4096;	// I'm a garbage collector

const ULONG ATT_NO_CLEANUP			= (ATT_no_cleanup | ATT_notify_gc);
#else
const ULONG ATT_NO_CLEANUP			= ATT_no_cleanup;
#endif

const ULONG ATT_cancel_raise		= 8192;		// Cancel currently running operation
const ULONG ATT_cancel_disable		= 16384;	// Disable cancel operations
const ULONG ATT_gfix_attachment		= 32768;	// Indicate a GFIX attachment
const ULONG ATT_gstat_attachment	= 65536;	// Indicate a GSTAT attachment
const ULONG ATT_no_db_triggers		= 131072;	// Don't execute database triggers


// Procedure block

class jrd_prc : public pool_alloc<type_prc>
{
public:
	USHORT prc_id;
	USHORT prc_flags;
	USHORT prc_inputs;
	USHORT prc_defaults;
	USHORT prc_outputs;
	jrd_nod*	prc_input_msg;				// It's set once by met.epp and never used.
	jrd_nod*	prc_output_msg;
	Format*		prc_input_fmt;
	Format*		prc_output_fmt;
	Format*		prc_format;
	vec<Parameter*>*	prc_input_fields;	// vector of field blocks
	vec<Parameter*>*	prc_output_fields;	// vector of field blocks
	prc_t		prc_type;					// procedure type
	jrd_req*	prc_request;				// compiled procedure request
	USHORT prc_use_count;					// requests compiled with procedure
	SSHORT prc_int_use_count;				// number of procedures compiled with procedure, set and
											// used internally in the MET_clear_cache procedure
											// no code should rely on value of this field
											// (it will usually be 0)
	Lock* prc_existence_lock;				// existence lock, if any
	Firebird::MetaName prc_security_name;	// security class name for procedure
	Firebird::MetaName prc_name;			// ascic name
	USHORT prc_alter_count;					// No. of times the procedure was altered

public:
	explicit jrd_prc(MemoryPool& p) : prc_security_name(p), prc_name(p) {}
};

// prc_flags

const USHORT PRC_scanned			= 1;	// Field expressions scanned
const USHORT PRC_system				= 2;	// Set in met.epp, never tested.
const USHORT PRC_obsolete			= 4;	// Procedure known gonzo
const USHORT PRC_being_scanned		= 8;	// New procedure needs dependencies during scan
//const USHORT PRC_blocking			= 16;	// Blocking someone from dropping procedure 
const USHORT PRC_create				= 32;	// Newly created. Set in met.epp, never tested or disabled.
const USHORT PRC_being_altered		= 64;	// Procedure is getting altered
									// This flag is used to make sure that MET_remove_procedure
									// does not delete and remove procedure block from cache
									// so dfw.epp:modify_procedure() can flip procedure body without 
									// invalidating procedure pointers from other parts of metadata cache
const USHORT PRC_check_existence	= 128;	// Existence lock released

const USHORT MAX_PROC_ALTER			= 64;	// No. of times an in-cache procedure can be altered



// Parameter block

class Parameter : public pool_alloc<type_prm>
{
public:
	USHORT		prm_number;
	dsc			prm_desc;
	jrd_nod*	prm_default_value;
	Firebird::MetaName prm_name;			// asciiz name
//public:
	explicit Parameter(MemoryPool& p) : prm_name(p) { }
};

// Index block to cache index information

class IndexBlock : public pool_alloc<type_idb>
{
public:
	IndexBlock*	idb_next;
	jrd_nod*	idb_expression;				// node tree for index expression
	jrd_req*	idb_expression_request;		// request in which index expression is evaluated
	dsc			idb_expression_desc;		// descriptor for expression result
	Lock*		idb_lock;					// lock to synchronize changes to index
	USHORT		idb_id;
};



// general purpose vector
template <class T, USHORT TYPE = type_vec>
class vec_base : protected pool_alloc<TYPE>
{
public:
	typedef typename Firebird::Array<T>::iterator iterator;
	typedef typename Firebird::Array<T>::const_iterator const_iterator;
	/*
	static vec_base* newVector(MemoryPool& p, int len)
	{
		return FB_NEW(p) vec_base<T, TYPE>(p, len);
	}
	static vec_base* newVector(MemoryPool& p, const vec_base& base)
	{
		return FB_NEW(p) vec_base<T, TYPE>(p, base);
	}
	*/
		
	// CVC: This should be size_t instead of ULONG for maximum portability.
	ULONG count() const { return v.getCount(); }
	T& operator[](size_t index) { return v[index]; }
	const T& operator[](size_t index) const { return v[index]; }

	iterator begin() { return v.begin(); }
	iterator end() { return v.end(); }

	const_iterator begin() const { return v.begin(); }
	const_iterator end() const { return v.end(); }
	
	void clear() { v.clear(); }
	//void prepend(int n) { v.insert(v.begin(), n); }
	
//	T* memPtr() { return &*(v.begin()); }
	T* memPtr() { return &v[0]; }

	void resize(size_t n, T val = T()) { v.resize(n, val); }

	void operator delete(void* mem) { MemoryPool::globalFree(mem); }

protected:
	vec_base(MemoryPool& p, int len)
		: v(p, len) { v.resize(len); }
	vec_base(MemoryPool& p, const vec_base& base)
		: v(p) { v = base.v; }

private:
	Firebird::Array<T> v;
};

template <typename T>
class vec : public vec_base<T, type_vec>
{
public:
	static vec* newVector(MemoryPool& p, int len)
	{
		return FB_NEW(p) vec<T>(p, len);
	}
	static vec* newVector(MemoryPool& p, const vec& base)
	{
		return FB_NEW(p) vec<T>(p, base);
	}
	static vec* newVector(MemoryPool& p, vec* base, int len)
	{
		if (!base)
			base = FB_NEW(p) vec<T>(p, len);
		else if (len > (int) base->count())
			base->resize(len);
		return base;
	}

private:
	vec(MemoryPool& p, int len) : vec_base<T, type_vec>(p, len) {}
	vec(MemoryPool& p, const vec& base) : vec_base<T, type_vec>(p, base) {}
};

class vcl : public vec_base<SLONG, type_vcl>
{
public:
	static vcl* newVector(MemoryPool& p, int len)
	{
		return FB_NEW(p) vcl(p, len);
	}
	static vcl* newVector(MemoryPool& p, const vcl& base)
	{
		return FB_NEW(p) vcl(p, base);
	}
	static vcl* newVector(MemoryPool& p, vcl* base, int len)
	{
		if (!base)
			base = FB_NEW(p) vcl(p, len);
		else if (len > (int) base->count())
			base->resize(len);
		return base;
	}

private:
	vcl(MemoryPool& p, int len) : vec_base<SLONG, type_vcl>(p, len) {}
	vcl(MemoryPool& p, const vcl& base) : vec_base<SLONG, type_vcl>(p, base) {}
};

//#define TEST_VECTOR(vector, number)      ((vector && number < vector->count()) ?
//					  (*vector)[number] : NULL)


//
// Transaction element block
//
struct teb {
	Attachment** teb_database;
	int teb_tpb_length;
	UCHAR* teb_tpb;
};

typedef teb TEB;

// Blocking Thread Block

class BlockingThread : public pool_alloc<type_btb>
{
public:
	BlockingThread* btb_next;
	thread* btb_thread_id;
};

// Window block for loading cached pages into
// CVC: Apparently, the only possible values are HEADER_PAGE==0 and LOG_PAGE==2
// and reside in ods.h, although I watched a place with 1 and others with members
// of a struct.

struct win {
	PageNumber win_page;
	Ods::pag* win_buffer;
	exp_index_buf* win_expanded_buffer;
	class BufferDesc* win_bdb;
	SSHORT win_scans;
	USHORT win_flags;
//	explicit win(SLONG wp) : win_page(wp), win_flags(0) {}
	explicit win(const PageNumber& wp) : win_page(wp), win_flags(0) {}
	win(const USHORT pageSpaceID, const SLONG pageNum) : 
		win_page(pageSpaceID, pageNum), win_flags(0) {}
};

typedef win WIN;

// This is a compilation artifact: I wanted to be sure I would pick all old "win"
// declarations at the top, so "win" was built with a mandatory argument in
// the constructor. This struct satisfies a single place with an array. The
// alternative would be to initialize 16 elements of the array with 16 calls
// to the constructor: win my_array[n] = {win(-1), ... (win-1)};
// When all places are changed, this class can disappear and win's constructor
// may get the default value of -1 to "wp".
struct win_for_array: public win
{
	win_for_array() : win(DB_PAGE_SPACE, -1) {}
};

// win_flags

const USHORT WIN_large_scan			= 1;	// large sequential scan
const USHORT WIN_secondary			= 2;	// secondary stream
const USHORT WIN_garbage_collector	= 4;	// garbage collector's window
const USHORT WIN_garbage_collect	= 8;	// scan left a page for garbage collector


// Thread specific database block
class thread_db : public ThreadData
{
private:
	JrdMemoryPool*	tdbb_default;
	void setDefaultPool(JrdMemoryPool* p)
	{
		tdbb_default = p;
	}
	friend class Firebird::SubsystemContextPoolHolder <Jrd::thread_db, JrdMemoryPool>;
public:
	thread_db() 
		: ThreadData(ThreadData::tddDBB)
	{
		tdbb_default = 0;
		tdbb_database = 0;
		tdbb_attachment = 0;
		tdbb_transaction = 0;
		tdbb_request = 0;
		tdbb_status_vector = 0;
		tdbb_quantum = 0;
		tdbb_flags = 0;
		tdbb_temp_attid = tdbb_temp_traid = 0;
		JRD_inuse_clear(this);
	}
	Database*	tdbb_database;
	Attachment*	tdbb_attachment;
	jrd_tra*	tdbb_transaction;
	jrd_req*	tdbb_request;
	ISC_STATUS*	tdbb_status_vector;
	SSHORT		tdbb_quantum;		// Cycles remaining until voluntary schedule
	USHORT		tdbb_flags;
	struct iuo	tdbb_mutexes;

	SLONG		tdbb_temp_attid;	// current temporary table scope
	SLONG		tdbb_temp_traid;	// current temporary table scope

#if defined(UNIX) && defined(SUPERSERVER)
	sigjmp_buf tdbb_sigsetjmp;
#endif

	JrdMemoryPool* getDefaultPool()
	{
		return tdbb_default;
	}
};

// tdbb_flags

const USHORT TDBB_sweeper				= 1;	// Thread sweeper or garbage collector
const USHORT TDBB_no_cache_unwind		= 2;	// Don't unwind page buffer cache
const USHORT TDBB_prc_being_dropped		= 4;	// Dropping a procedure
const USHORT TDBB_backup_write_locked	= 8;    // BackupManager has write lock on LCK_backup_database
const USHORT TDBB_stack_trace_done		= 16;	// PSQL stack trace is added into status-vector
const USHORT TDBB_shutdown_manager		= 32;	// Server shutdown thread
const USHORT TDBB_deferred				= 64;	// deferred work performed now
const USHORT TDBB_sys_error				= 128;	// error shouldn't be handled by the looper

// duplicate context of firebird string to store in jrd_nod::nod_arg
inline char* stringDup(MemoryPool& p, const Firebird::string& s)
{
	char* rc = (char*) p.allocate(s.length() + 1, 0
#ifdef DEBUG_GDS_ALLOC
		, __FILE__, __LINE__
#endif
		);
	strcpy(rc, s.c_str());
	return rc;
}

inline char* stringDup(MemoryPool& p, const char* s, size_t l)
{
	char* rc = (char*) p.allocate(l + 1, 0
#ifdef DEBUG_GDS_ALLOC
		, __FILE__, __LINE__
#endif
		);
	memcpy(rc, s, l);
	rc[l] = 0;
	return rc;
}

inline char* stringDup(MemoryPool& p, const char* s)
{
	if (! s)
	{
		return 0;
	}
	return stringDup(p, s, strlen(s));
}

// Used in string convsersion calls
typedef Firebird::HalfStaticArray<UCHAR, 256> MoveBuffer;

} //namespace Jrd

// Lock levels
#include "../lock/lock.h"

// Random string block -- as long as impure areas don't have
// constructors and destructors, the need this varying string

class VaryingString : public pool_alloc_rpt<SCHAR, type_str>
{
public:
	USHORT str_length;
	UCHAR str_data[2];			// one byte for ALLOC and one for the NULL
};

// Threading macros

/* Define JRD_get_thread_data off the platform specific version.
 * If we're in DEV mode, also do consistancy checks on the
 * retrieved memory structure.  This was originally done to
 * track down cases of no "PUT_THREAD_DATA" on the NLM. 
 *
 * This allows for NULL thread data (which might be an error by itself)
 * If there is thread data, 
 * AND it is tagged as being a thread_db.
 * AND it has a non-NULL tdbb_database field, 
 * THEN we validate that the structure there is a database block.
 * Otherwise, we return what we got.
 * We can't always validate the database field, as during initialization
 * there is no tdbb_database set up.
 */

#include "../jrd/thd.h"

#if defined(DEV_BUILD)
#include "../jrd/err_proto.h"

inline Jrd::thread_db* JRD_get_thread_data() {
	ThreadData* p1 = ThreadData::getSpecific();
	if (p1 && p1->getType() == ThreadData::tddDBB)
	{
		Jrd::thread_db* p2 = (Jrd::thread_db*)p1;
		if (p2->tdbb_database && MemoryPool::blk_type(p2->tdbb_database) != type_dbb)
		{
			BUGCHECK(147);
		}
	}
	return (Jrd::thread_db*) p1;
}
inline void CHECK_TDBB(const Jrd::thread_db* tdbb) {
	fb_assert(tdbb && (tdbb->getType() == ThreadData::tddDBB) &&
			(!tdbb->tdbb_database ||
				MemoryPool::blk_type(tdbb->tdbb_database) == type_dbb));
}
inline void CHECK_DBB(const Jrd::Database* dbb) {
	fb_assert(dbb && MemoryPool::blk_type(dbb) == type_dbb);
}

#else
// PROD_BUILD
inline Jrd::thread_db* JRD_get_thread_data() {
	return (Jrd::thread_db*) ThreadData::getSpecific();
}
inline void CHECK_DBB(const Jrd::Database* dbb) {
}
inline void CHECK_TDBB(const Jrd::thread_db* tdbb) {
}

#endif

inline Jrd::Database* GET_DBB() {
	return JRD_get_thread_data()->tdbb_database;
}

/*-------------------------------------------------------------------------*
 * macros used to set thread_db and Database pointers when there are not set already *
 *-------------------------------------------------------------------------*/
inline void SET_TDBB(Jrd::thread_db* &tdbb) {
	if (tdbb == NULL) {
		tdbb = JRD_get_thread_data();
	}
	CHECK_TDBB(tdbb);
}
inline void SET_DBB(Jrd::Database* &dbb) {
	if (dbb == NULL) {
		dbb = GET_DBB();
	}
	CHECK_DBB(dbb);
}

#ifdef MULTI_THREAD
#define THD_JRD_MUTEX_LOCK(mutx)        JRD_mutex_lock(mutx)
#define THD_JRD_MUTEX_UNLOCK(mutx)      JRD_mutex_unlock(mutx)
#else
#define THD_JRD_MUTEX_LOCK(mutx)
#define THD_JRD_MUTEX_UNLOCK(mutx)
#endif


// global variables for engine


#if !defined(REQUESTER)

extern int debug;

#endif // REQUESTER


/* Define the xxx_thread_data macros.  These are needed in the whole 
   component, but they are defined differently for use in jrd.cpp (JRD_MAIN)
   Here we have a function which sets some flags, and then calls THD_put_specific
   so in this case we define the macro as calling that function. */
// CVC: This may be obsolete now that different subsystems use different macro/function names.

inline static void JRD_set_thread_data(Jrd::thread_db* &tdbb, Jrd::thread_db& thd_context)
{
	tdbb = &thd_context;
	tdbb->putSpecific();
}

inline void JRD_restore_thread_data() {
	ThreadData::restoreSpecific();
}

namespace Jrd {
	typedef Firebird::SubsystemContextPoolHolder <Jrd::thread_db, JrdMemoryPool> 
		ContextPoolHolder;
}

#endif // JRD_JRD_H