thodg/libgit2/src/repository.h

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• Hash : 53607868
  Author :
  Date : 2013-04-15T00:09:03
  

  Further threading fixes This builds on the earlier thread safety work to make it so that setting the odb, index, refdb, or config for a repository is done in a threadsafe manner with minimized locking time. This is done by adding a lock to the repository object and using it to guard the assignment of the above listed pointers. The lock is only held to assign the pointer value. This also contains some minor fixes to the other work with pack files to reduce the time that locks are being held to and fix an apparently memory leak.

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• src/repository.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_repository_h__
  #define INCLUDE_repository_h__
  
  #include "git2/common.h"
  #include "git2/oid.h"
  #include "git2/odb.h"
  #include "git2/repository.h"
  #include "git2/object.h"
  
  #include "index.h"
  #include "cache.h"
  #include "refs.h"
  #include "buffer.h"
  #include "odb.h"
  #include "object.h"
  #include "attrcache.h"
  #include "strmap.h"
  #include "refdb.h"
  
  #define DOT_GIT ".git"
  #define GIT_DIR DOT_GIT "/"
  #define GIT_DIR_MODE 0755
  #define GIT_BARE_DIR_MODE 0777
  
  /** Cvar cache identifiers */
  typedef enum {
  	GIT_CVAR_AUTO_CRLF = 0, /* core.autocrlf */
  	GIT_CVAR_EOL, /* core.eol */
  	GIT_CVAR_CACHE_MAX
  } git_cvar_cached;
  
  /**
   * CVAR value enumerations
   *
   * These are the values that are actually stored in the cvar cache, instead
   * of their string equivalents. These values are internal and symbolic;
   * make sure that none of them is set to `-1`, since that is the unique
   * identifier for "not cached"
   */
  typedef enum {
  	/* The value hasn't been loaded from the cache yet */
  	GIT_CVAR_NOT_CACHED = -1,
  
  	/* core.safecrlf: false, 'fail', 'warn' */
  	GIT_SAFE_CRLF_FALSE = 0,
  	GIT_SAFE_CRLF_FAIL = 1,
  	GIT_SAFE_CRLF_WARN = 2,
  
  	/* core.autocrlf: false, true, 'input; */
  	GIT_AUTO_CRLF_FALSE = 0,
  	GIT_AUTO_CRLF_TRUE = 1,
  	GIT_AUTO_CRLF_INPUT = 2,
  	GIT_AUTO_CRLF_DEFAULT = GIT_AUTO_CRLF_FALSE,
  
  	/* core.eol: unset, 'crlf', 'lf', 'native' */
  	GIT_EOL_UNSET = 0,
  	GIT_EOL_CRLF = 1,
  	GIT_EOL_LF = 2,
  #ifdef GIT_WIN32
  	GIT_EOL_NATIVE = GIT_EOL_CRLF,
  #else
  	GIT_EOL_NATIVE = GIT_EOL_LF,
  #endif
  	GIT_EOL_DEFAULT = GIT_EOL_NATIVE
  } git_cvar_value;
  
  /* internal repository init flags */
  enum {
  	GIT_REPOSITORY_INIT__HAS_DOTGIT = (1u << 16),
  	GIT_REPOSITORY_INIT__NATURAL_WD = (1u << 17),
  	GIT_REPOSITORY_INIT__IS_REINIT  = (1u << 18),
  };
  
  /** Internal structure for repository object */
  struct git_repository {
  	git_odb *_odb;
  	git_refdb *_refdb;
  	git_config *_config;
  	git_index *_index;
  	git_mutex lock;
  
  	git_cache objects;
  	git_attr_cache attrcache;
  	git_strmap *submodules;
  
  	char *path_repository;
  	char *workdir;
  
  	unsigned is_bare:1;
  	unsigned int lru_counter;
  
  	git_cvar_value cvar_cache[GIT_CVAR_CACHE_MAX];
  };
  
  GIT_INLINE(git_attr_cache *) git_repository_attr_cache(git_repository *repo)
  {
  	return &repo->attrcache;
  }
  
  int git_repository_head_tree(git_tree **tree, git_repository *repo);
  
  /*
   * Weak pointers to repository internals.
   *
   * The returned pointers do not need to be freed. Do not keep
   * permanent references to these (i.e. between API calls), since they may
   * become invalidated if the user replaces a repository internal.
   */
  int git_repository_config__weakptr(git_config **out, git_repository *repo);
  int git_repository_odb__weakptr(git_odb **out, git_repository *repo);
  int git_repository_refdb__weakptr(git_refdb **out, git_repository *repo);
  int git_repository_index__weakptr(git_index **out, git_repository *repo);
  
  /*
   * CVAR cache
   *
   * Efficient access to the most used config variables of a repository.
   * The cache is cleared everytime the config backend is replaced.
   */
  int git_repository__cvar(int *out, git_repository *repo, git_cvar_cached cvar);
  void git_repository__cvar_cache_clear(git_repository *repo);
  
  /*
   * Submodule cache
   */
  extern void git_submodule_config_free(git_repository *repo);
  
  GIT_INLINE(int) git_repository__ensure_not_bare(
  	git_repository *repo,
  	const char *operation_name)
  {
  	if (!git_repository_is_bare(repo))
  		return 0;
  
  	giterr_set(
  		GITERR_REPOSITORY,
  		"Cannot %s. This operation is not allowed against bare repositories.",
  		operation_name);
  
  	return GIT_EBAREREPO;
  }
  
  #endif
  

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