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opt / alt / postgresql11 / usr / include / pgsql / server / storage /

📁 ..
📄 backendid.h(730 B)
📄 barrier.h(6.6 KB)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(7.79 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(7.2 KB)
📄 bufpage.h(12.91 KB)
📄 copydir.h(561 B)
📄 fd.h(3.56 KB)
📄 freespace.h(1.23 KB)
📄 fsm_internals.h(2.24 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.54 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.72 KB)
📄 large_object.h(2.89 KB)
📄 latch.h(5.28 KB)
📄 lmgr.h(3.22 KB)
📄 lock.h(21.16 KB)
📄 lwlock.h(3.58 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.41 KB)
📄 pg_shmem.h(1.95 KB)
📄 pmsignal.h(2.03 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.98 KB)
📄 proc.h(9.58 KB)
📄 procarray.h(2.96 KB)
📄 procsignal.h(1.76 KB)
📄 reinit.h(588 B)
📄 relfilenode.h(4.31 KB)
📄 s_lock.h(28 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(4.97 KB)
📄 sinvaladt.h(1.49 KB)
📄 smgr.h(5.67 KB)
📄 spin.h(2.71 KB)
📄 standby.h(3.97 KB)

Editing: fsm_internals.h

/*-------------------------------------------------------------------------
 *
 * fsm_internal.h
 *	  internal functions for free space map
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/fsm_internals.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef FSM_INTERNALS_H
#define FSM_INTERNALS_H

#include "storage/buf.h"
#include "storage/bufpage.h"

/*
 * Structure of a FSM page. See src/backend/storage/freespace/README for
 * details.
 */
typedef struct
{
	/*
	 * fsm_search_avail() tries to spread the load of multiple backends by
	 * returning different pages to different backends in a round-robin
	 * fashion. fp_next_slot points to the next slot to be returned (assuming
	 * there's enough space on it for the request). It's defined as an int,
	 * because it's updated without an exclusive lock. uint16 would be more
	 * appropriate, but int is more likely to be atomically
	 * fetchable/storable.
	 */
	int			fp_next_slot;

/*
	 * fp_nodes contains the binary tree, stored in array. The first
	 * NonLeafNodesPerPage elements are upper nodes, and the following
	 * LeafNodesPerPage elements are leaf nodes. Unused nodes are zero.
	 */
	uint8		fp_nodes[1];
} FSMPageData;

typedef FSMPageData *FSMPage;

/*
 * Number of non-leaf and leaf nodes, and nodes in total, on an FSM page.
 * These definitions are internal to fsmpage.c.
 */
#define NodesPerPage (BLCKSZ - MAXALIGN(SizeOfPageHeaderData) - \
					  offsetof(FSMPageData, fp_nodes))

#define NonLeafNodesPerPage (BLCKSZ / 2 - 1)
#define LeafNodesPerPage (NodesPerPage - NonLeafNodesPerPage)

/*
 * Number of FSM "slots" on a FSM page. This is what should be used
 * outside fsmpage.c.
 */
#define SlotsPerFSMPage LeafNodesPerPage

/* Prototypes for functions in fsmpage.c */
extern int fsm_search_avail(Buffer buf, uint8 min_cat, bool advancenext,
				 bool exclusive_lock_held);
extern uint8 fsm_get_avail(Page page, int slot);
extern uint8 fsm_get_max_avail(Page page);
extern bool fsm_set_avail(Page page, int slot, uint8 value);
extern bool fsm_truncate_avail(Page page, int nslots);
extern bool fsm_rebuild_page(Page page);

#endif   /* FSM_INTERNALS_H */

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