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/*-------------------------------------------------------------------------
*
* dsm.h
* manage dynamic shared memory segments
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/dsm.h
*
*-------------------------------------------------------------------------
*/
#ifndef DSM_H
#define DSM_H
#include "storage/dsm_impl.h"
typedef struct dsm_segment dsm_segment;
/* Initialization function. */
extern void dsm_postmaster_startup(void);
/* Functions that create, update, or remove mappings. */
extern dsm_segment *dsm_create(Size size);
extern dsm_segment *dsm_attach(dsm_handle h);
extern void *dsm_resize(dsm_segment *seg, Size size);
extern void *dsm_remap(dsm_segment *seg);
extern void dsm_detach(dsm_segment *seg);
/* Resource management functions. */
extern void dsm_keep_mapping(dsm_segment *seg);
extern dsm_segment *dsm_find_mapping(dsm_handle h);
/* Informational functions. */
extern void *dsm_segment_address(dsm_segment *seg);
extern Size dsm_segment_map_length(dsm_segment *seg);
extern dsm_handle dsm_segment_handle(dsm_segment *seg);
#endif /* DSM_H */
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