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2ff501590b
Also performed an initial run through of upgrading our Copyright date to extend to 2005 ... first run here was very simple ... change everything where: grep 1996-2004 && the word 'Copyright' ... scanned through the generated list with 'less' first, and after, to make sure that I only picked up the right entries ...
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* shmem.h
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* shared memory management structures
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/shmem.h,v 1.44 2004/12/31 22:03:42 pgsql Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SHMEM_H
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#define SHMEM_H
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#include "utils/hsearch.h"
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/*
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* The shared memory region can start at a different address
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* in every process. Shared memory "pointers" are actually
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* offsets relative to the start of the shared memory region(s).
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*
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* In current usage, this is not actually a problem, but we keep
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* the code that used to handle it...
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*/
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typedef unsigned long SHMEM_OFFSET;
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#define INVALID_OFFSET (-1)
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#define BAD_LOCATION (-1)
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/*
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* Start of the primary shared memory region, in this process' address space.
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* The macros in this header file can only cope with offsets into this
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* shared memory region!
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*/
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extern DLLIMPORT SHMEM_OFFSET ShmemBase;
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/* coerce an offset into a pointer in this process's address space */
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#define MAKE_PTR(xx_offs)\
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(ShmemBase+((unsigned long)(xx_offs)))
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/* coerce a pointer into a shmem offset */
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#define MAKE_OFFSET(xx_ptr)\
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((SHMEM_OFFSET) (((unsigned long)(xx_ptr))-ShmemBase))
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#define SHM_PTR_VALID(xx_ptr)\
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(((unsigned long)(xx_ptr)) > ShmemBase)
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/* cannot have an offset to ShmemFreeStart (offset 0) */
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#define SHM_OFFSET_VALID(xx_offs)\
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(((xx_offs) != 0) && ((xx_offs) != INVALID_OFFSET))
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/* shmqueue.c */
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typedef struct SHM_QUEUE
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{
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SHMEM_OFFSET prev;
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SHMEM_OFFSET next;
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} SHM_QUEUE;
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/* shmem.c */
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extern void InitShmemAllocation(void *seghdr, bool init);
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extern void *ShmemAlloc(Size size);
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extern bool ShmemIsValid(unsigned long addr);
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extern void InitShmemIndex(void);
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extern HTAB *ShmemInitHash(const char *name, long init_size, long max_size,
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HASHCTL *infoP, int hash_flags);
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extern void *ShmemInitStruct(const char *name, Size size, bool *foundPtr);
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/* size constants for the shmem index table */
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/* max size of data structure string name */
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#define SHMEM_INDEX_KEYSIZE (48)
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/* max size of the shmem index table (not a hard limit) */
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#define SHMEM_INDEX_SIZE (32)
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/* this is a hash bucket in the shmem index table */
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typedef struct
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{
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char key[SHMEM_INDEX_KEYSIZE]; /* string name */
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unsigned long location; /* location in shared mem */
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unsigned long size; /* numbytes allocated for the structure */
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} ShmemIndexEnt;
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/*
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* prototypes for functions in shmqueue.c
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*/
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extern void SHMQueueInit(SHM_QUEUE *queue);
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extern void SHMQueueElemInit(SHM_QUEUE *queue);
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extern void SHMQueueDelete(SHM_QUEUE *queue);
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extern void SHMQueueInsertBefore(SHM_QUEUE *queue, SHM_QUEUE *elem);
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extern Pointer SHMQueueNext(SHM_QUEUE *queue, SHM_QUEUE *curElem,
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Size linkOffset);
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extern bool SHMQueueEmpty(SHM_QUEUE *queue);
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#endif /* SHMEM_H */
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