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* Copyright (c) 2000-2001 Silicon Graphics, Inc.
* All Rights Reserved.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef WIN_H
#define WIN_H
/* win.[ch] - windows into a very large file
typedef intgen_t segix_t;
/* initialize the window abstraction
void win_init( intgen_t fd,
off64_t rngoff, /* offset into file of windowing */
size64_t winsz, /* window size */
size_t wincntmax ); /* max number of windows to manage */
/* supply a pointer to the portion of the file identified by segix.
void win_map( segix_t segix, /* segment index to be mapped */
void **pp ); /* returns pointer by reference */
/* invalidate the pointer previously supplied. SIDE-EFFECT: zeros
* by reference the caller's pointer.
void win_unmap( segix_t segix, /* must match win_map param */
void **pp ); /* ptr generated by win_map: ZEROED */
* Functions used to disable the window locking from happening.
* This is used in the directory reconstruction phase where only
* one thread is actually executing this code.
* Assumes called in region where only 1 thread can execute it.
void win_locks_off(void);
void win_locks_on(void);
* Find out how many mmap calls were made for windows.
size_t win_getnum_mmaps(void);
#endif /* WIN_H */