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📁 ..
📄 backendid.h(1.1 KB)
📄 barrier.h(674 B)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(12.24 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(9 KB)
📄 bufpage.h(14.91 KB)
📄 checksum.h(666 B)
📄 checksum_impl.h(8.59 KB)
📄 copydir.h(561 B)
📄 dsm.h(1.95 KB)
📄 dsm_impl.h(2.12 KB)
📄 fd.h(4.27 KB)
📄 freespace.h(1.36 KB)
📄 fsm_internals.h(2.26 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.67 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.93 KB)
📄 large_object.h(3.6 KB)
📄 latch.h(6.55 KB)
📄 lmgr.h(4.19 KB)
📄 lock.h(22.89 KB)
📄 lockdefs.h(1.86 KB)
📄 lwlock.h(9.19 KB)
📄 lwlocknames.h(2.42 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.39 KB)
📄 pg_shmem.h(2.23 KB)
📄 pmsignal.h(2.1 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.96 KB)
📄 proc.h(10.81 KB)
📄 procarray.h(3.5 KB)
📄 procsignal.h(1.9 KB)
📄 reinit.h(592 B)
📄 relfilenode.h(3.81 KB)
📄 s_lock.h(28.64 KB)
📄 shm_mq.h(2.59 KB)
📄 shm_toc.h(2.01 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(5.41 KB)
📄 sinvaladt.h(1.58 KB)
📄 smgr.h(5.96 KB)
📄 spin.h(2.42 KB)
📄 standby.h(3.35 KB)
📄 standbydefs.h(2.25 KB)

Editing: pg_shmem.h

/*-------------------------------------------------------------------------
 *
 * pg_shmem.h
 *	  Platform-independent API for shared memory support.
 *
 * Every port is expected to support shared memory with approximately
 * SysV-ish semantics; in particular, a memory block is not anonymous
 * but has an ID, and we must be able to tell whether there are any
 * remaining processes attached to a block of a specified ID.
 *
 * To simplify life for the SysV implementation, the ID is assumed to
 * consist of two unsigned long values (these are key and ID in SysV
 * terms).  Other platforms may ignore the second value if they need
 * only one ID number.
 *
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/pg_shmem.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_SHMEM_H
#define PG_SHMEM_H

#include "storage/dsm_impl.h"

typedef struct PGShmemHeader	/* standard header for all Postgres shmem */
{
	int32		magic;			/* magic # to identify Postgres segments */
#define PGShmemMagic  679834894
	pid_t		creatorPID;		/* PID of creating process */
	Size		totalsize;		/* total size of segment */
	Size		freeoffset;		/* offset to first free space */
	dsm_handle	dsm_control;	/* ID of dynamic shared memory control seg */
	void	   *index;			/* pointer to ShmemIndex table */
#ifndef WIN32					/* Windows doesn't have useful inode#s */
	dev_t		device;			/* device data directory is on */
	ino_t		inode;			/* inode number of data directory */
#endif
} PGShmemHeader;

/* GUC variable */
extern int	huge_pages;

/* Possible values for huge_pages */
typedef enum
{
	HUGE_PAGES_OFF,
	HUGE_PAGES_ON,
	HUGE_PAGES_TRY
}	HugePagesType;

#ifndef WIN32
extern unsigned long UsedShmemSegID;
#else
extern HANDLE UsedShmemSegID;
#endif
extern void *UsedShmemSegAddr;

#ifdef EXEC_BACKEND
extern void PGSharedMemoryReAttach(void);
extern void PGSharedMemoryNoReAttach(void);
#endif

extern PGShmemHeader *PGSharedMemoryCreate(Size size, bool makePrivate,
					 int port, PGShmemHeader **shim);
extern bool PGSharedMemoryIsInUse(unsigned long id1, unsigned long id2);
extern void PGSharedMemoryDetach(void);

#endif   /* PG_SHMEM_H */

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Editing: pg_shmem.h

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