thodg/libgit2/src/mwindow.h

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• Hash : 1d8943c6
  Author :
  Date : 2012-06-28T12:05:49
  

  mwindow: allow memory-window files to deregister
  
  Once a file is registered, there is no way to deregister it, even
  after the structure that contains it is no longer needed and has been
  freed. This may be the source of #624.
  
  Allow and use the deregister function to remove our file from the
  global list.
  

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• src/mwindow.h

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #ifndef INCLUDE_mwindow__
  #define INCLUDE_mwindow__
  
  #include "map.h"
  #include "vector.h"
  
  typedef struct git_mwindow {
  	struct git_mwindow *next;
  	git_map window_map;
  	git_off_t offset;
  	size_t last_used;
  	size_t inuse_cnt;
  } git_mwindow;
  
  typedef struct git_mwindow_file {
  	git_mwindow *windows;
  	int fd;
  	git_off_t size;
  } git_mwindow_file;
  
  typedef struct git_mwindow_ctl {
  	size_t mapped;
  	unsigned int open_windows;
  	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, git_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_off_t offset, size_t 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);
  int git_mwindow_file_deregister(git_mwindow_file *mwf);
  void git_mwindow_close(git_mwindow **w_cursor);
  
  #endif
  

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