thodg/libgit2/src/mwindow.h

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• Hash : 7bfdb3d2
  Author :
  Date : 2011-06-28T20:39:30
  

  Factor out the mmap window code This code is useful for more things than just the packfile handling code. Factor it out so it can be reused. Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

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• src/mwindow.h

• /*
   * This file is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License, version 2,
   * as published by the Free Software Foundation.
   *
   * In addition to the permissions in the GNU General Public License,
   * the authors give you unlimited permission to link the compiled
   * version of this file into combinations with other programs,
   * and to distribute those combinations without any restriction
   * coming from the use of this file.  (The General Public License
   * restrictions do apply in other respects; for example, they cover
   * modification of the file, and distribution when not linked into
   * a combined executable.)
   *
   * This file is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; see the file COPYING.  If not, write to
   * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #ifndef INCLUDE_mwindow__
  #define INCLUDE_mwindow__
  
  #include "map.h"
  #include "vector.h"
  #include "fileops.h"
  
  typedef struct git_mwindow {
  	struct git_mwindow *next;
  	git_map window_map;
  	off_t offset;
  	unsigned int last_used;
  	unsigned int inuse_cnt;
  } git_mwindow;
  
  typedef struct git_mwindow_file {
  	git_mwindow *windows;
  } git_mwindow_file;
  
  typedef struct git_mwindow_ctl {
  	size_t mapped;
  	unsigned int open_windows;
  	size_t window_size; /* needs default value */
  	size_t mapped_limit; /* needs default value */
  	unsigned int mmap_calls;
  	unsigned int peak_open_windows;
  	size_t peak_mapped;
  	size_t used_ctr;
  	git_vector windowfiles;
  } git_mwindow_ctl;
  
  int git_mwindow_contains(git_mwindow *win, off_t offset);
  void git_mwindow_free_all(git_mwindow_file *mwf);
  unsigned char *git_mwindow_open(git_mwindow_file *mwf, git_mwindow **cursor, git_file fd, size_t size, off_t offset, int extra, unsigned int *left);
  void git_mwindow_scan_lru(git_mwindow_file *mwf, git_mwindow **lru_w, git_mwindow **lru_l);
  int git_mwindow_file_register(git_mwindow_file *mwf);
  void git_mwindow_close(git_mwindow **w_cursor);
  
  #endif
  

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