thodg/libgit2/src/map.h

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• Hash : f7310540
  Author :
  Date : 2014-05-13T02:41:48
  

  indexer: use mmap for writing
  
  Some OSs cannot keep their ideas about file content straight when mixing
  standard IO with file mapping. As we use mmap for reading from the
  packfile, let's make writing to the pack file use mmap.
  

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• src/map.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * 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_map_h__
  #define INCLUDE_map_h__
  
  #include "common.h"
  
  
  /* p_mmap() prot values */
  #define GIT_PROT_NONE 0x0
  #define GIT_PROT_READ 0x1
  #define GIT_PROT_WRITE 0x2
  #define GIT_PROT_EXEC 0x4
  
  /* git__mmmap() flags values */
  #define GIT_MAP_FILE	0
  #define GIT_MAP_SHARED 1
  #define GIT_MAP_PRIVATE 2
  #define GIT_MAP_TYPE	0xf
  #define GIT_MAP_FIXED	0x10
  
  #ifdef __amigaos4__
  #define MAP_FAILED 0
  #endif
  
  typedef struct { /* memory mapped buffer	*/
  	void *data; /* data bytes			*/
  	size_t len; /* data length			*/
  #ifdef GIT_WIN32
  	HANDLE fmh; /* file mapping handle */
  #endif
  } git_map;
  
  #define GIT_MMAP_VALIDATE(out, len, prot, flags) do { \
  	assert(out != NULL && len > 0); \
  	assert((prot & GIT_PROT_WRITE) || (prot & GIT_PROT_READ)); \
  	assert((flags & GIT_MAP_FIXED) == 0); } while (0)
  
  extern int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset);
  extern int p_munmap(git_map *map);
  extern long git__page_size(void);
  
  #endif /* INCLUDE_map_h__ */
  

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