src/include/storage/sharedfileset.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * sharedfileset.h
   4  *        Shared temporary file management.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * src/include/storage/sharedfileset.h
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14
  15 #ifndef SHAREDFILESET_H
  16 #define SHAREDFILESET_H
  17
  18 #include "storage/dsm.h"
  19 #include "storage/fd.h"
  20 #include "storage/fileset.h"
  21 #include "storage/spin.h"
  22
  23 /*
  24  * A set of temporary files that can be shared by multiple backends.
  25  */
  26 typedef struct SharedFileSet
  27 {
  28         FileSet         fs;
  29         slock_t         mutex;                  /* mutex protecting the reference count */
  30         int                     refcnt;                 /* number of attached backends */
  31 } SharedFileSet;
  32
  33 extern void SharedFileSetInit(SharedFileSet *fileset, dsm_segment *seg);
  34 extern void SharedFileSetAttach(SharedFileSet *fileset, dsm_segment *seg);
  35 extern void SharedFileSetDeleteAll(SharedFileSet *fileset);
  36
  37 #endif