thodg/libgit2/tests/pack/sharing.c

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• Hash : b3b66c57
  Author :
  Date : 2014-06-18T17:13:12
  

  Share packs across repository instances Opening the same repository multiple times will currently open the same file multiple times, as well as map the same region of the file multiple times. This is not necessary, as the packfile data is immutable. Instead of opening and closing packfiles directly, introduce an indirection and allocate packfiles globally. This does mean locking on each packfile open, but we already use this lock for the global mwindow list so it doesn't introduce a new contention point.

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• tests/pack/sharing.c

• #include "clar_libgit2.h"
  #include <git2.h>
  #include "strmap.h"
  #include "mwindow.h"
  #include "pack.h"
  
  extern git_strmap *git__pack_cache;
  
  void test_pack_sharing__open_two_repos(void)
  {
  	git_repository *repo1, *repo2;
  	git_object *obj1, *obj2;
  	git_oid id;
  	git_strmap_iter pos;
  	void *data;
  	int error;
  
  	cl_git_pass(git_repository_open(&repo1, cl_fixture("testrepo.git")));
  	cl_git_pass(git_repository_open(&repo2, cl_fixture("testrepo.git")));
  
  	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
  
  	cl_git_pass(git_object_lookup(&obj1, repo1, &id, GIT_OBJ_ANY));
  	cl_git_pass(git_object_lookup(&obj2, repo2, &id, GIT_OBJ_ANY));
  
  	pos = 0;
  	while ((error = git_strmap_next(&data, &pos, git__pack_cache)) == 0) {
  		struct git_pack_file *pack = (struct git_pack_file *) data;
  
  		cl_assert_equal_i(2, pack->refcount.val);
  	}
  
  	cl_assert_equal_i(3, git_strmap_num_entries(git__pack_cache));
  
  	git_object_free(obj1);
  	git_object_free(obj2);
  	git_repository_free(repo1);
  	git_repository_free(repo2);
  
  	/* we don't want to keep the packs open after the repos go away */
  	cl_assert_equal_i(0, git_strmap_num_entries(git__pack_cache));
  }
  

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