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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: shmem.h

/*-------------------------------------------------------------------------
 *
 * shmem.h
 *	  shared memory management structures
 *
 * Historical note:
 * A long time ago, Postgres' shared memory region was allowed to be mapped
 * at a different address in each process, and shared memory "pointers" were
 * passed around as offsets relative to the start of the shared memory region.
 * That is no longer the case: each process must map the shared memory region
 * at the same address.  This means shared memory pointers can be passed
 * around directly between different processes.
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/shmem.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SHMEM_H
#define SHMEM_H

#include "utils/hsearch.h"

/* shmqueue.c */
typedef struct SHM_QUEUE
{
	struct SHM_QUEUE *prev;
	struct SHM_QUEUE *next;
} SHM_QUEUE;

/* shmem.c */
extern void InitShmemAccess(void *seghdr);
extern void InitShmemAllocation(void);
extern void *ShmemAlloc(Size size);
extern bool ShmemAddrIsValid(const void *addr);
extern void InitShmemIndex(void);
extern HTAB *ShmemInitHash(const char *name, long init_size, long max_size,
			  HASHCTL *infoP, int hash_flags);
extern void *ShmemInitStruct(const char *name, Size size, bool *foundPtr);
extern Size add_size(Size s1, Size s2);
extern Size mul_size(Size s1, Size s2);

/* ipci.c */
extern void RequestAddinShmemSpace(Size size);

/* size constants for the shmem index table */
 /* max size of data structure string name */
#define SHMEM_INDEX_KEYSIZE		 (48)
 /* estimated size of the shmem index table (not a hard limit) */
#define SHMEM_INDEX_SIZE		 (64)

/* this is a hash bucket in the shmem index table */
typedef struct
{
	char		key[SHMEM_INDEX_KEYSIZE];		/* string name */
	void	   *location;		/* location in shared mem */
	Size		size;			/* # bytes allocated for the structure */
} ShmemIndexEnt;

/*
 * prototypes for functions in shmqueue.c
 */
extern void SHMQueueInit(SHM_QUEUE *queue);
extern void SHMQueueElemInit(SHM_QUEUE *queue);
extern void SHMQueueDelete(SHM_QUEUE *queue);
extern void SHMQueueInsertBefore(SHM_QUEUE *queue, SHM_QUEUE *elem);
extern void SHMQueueInsertAfter(SHM_QUEUE *queue, SHM_QUEUE *elem);
extern Pointer SHMQueueNext(const SHM_QUEUE *queue, const SHM_QUEUE *curElem,
			 Size linkOffset);
extern Pointer SHMQueuePrev(const SHM_QUEUE *queue, const SHM_QUEUE *curElem,
			 Size linkOffset);
extern bool SHMQueueEmpty(const SHM_QUEUE *queue);
extern bool SHMQueueIsDetached(const SHM_QUEUE *queue);

#endif   /* SHMEM_H */

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Editing: shmem.h

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