granicus.if.org Git - postgresql/blob - src/include/storage/dsm.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * dsm.h
   4  *        manage dynamic shared memory segments
   5  *
   6  * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * src/include/storage/dsm.h
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13 #ifndef DSM_H
  14 #define DSM_H
  15
  16 #include "storage/dsm_impl.h"
  17
  18 typedef struct dsm_segment dsm_segment;
  19
  20 /* Initialization function. */
  21 extern void dsm_postmaster_startup(void);
  22
  23 /* Functions that create, update, or remove mappings. */
  24 extern dsm_segment *dsm_create(Size size);
  25 extern dsm_segment *dsm_attach(dsm_handle h);
  26 extern void *dsm_resize(dsm_segment *seg, Size size);
  27 extern void *dsm_remap(dsm_segment *seg);
  28 extern void dsm_detach(dsm_segment *seg);
  29
  30 /* Resource management functions. */
  31 extern void dsm_keep_mapping(dsm_segment *seg);
  32 extern dsm_segment *dsm_find_mapping(dsm_handle h);
  33
  34 /* Informational functions. */
  35 extern void *dsm_segment_address(dsm_segment *seg);
  36 extern Size dsm_segment_map_length(dsm_segment *seg);
  37 extern dsm_handle dsm_segment_handle(dsm_segment *seg);
  38
  39 #endif   /* DSM_H */