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cache.h: document `write_locked_index()` 

The next patches will tweak the behavior of this function. Document it
in order to establish a basis for those patches.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Martin Ågren 2017-10-05 22:32:11 +02:00 committed by Junio C Hamano
parent d13cd4c927
commit 8dc3834610
1 changed files with 16 additions and 0 deletions
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16
cache.h
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@ -601,9 +601,25 @@ extern int do_read_index(struct index_state *istate, const char *path,
extern int read_index_from(struct index_state *, const char *path);
extern int is_index_unborn(struct index_state *);
extern int read_index_unmerged(struct index_state *);
/* For use with `write_locked_index()`. */
#define COMMIT_LOCK (1 << 0)
#define CLOSE_LOCK (1 << 1)
/*
* Write the index while holding an already-taken lock. The flags may
* contain at most one of `COMMIT_LOCK` and `CLOSE_LOCK`.
*
* Unless a split index is in use, write the index into the lockfile.
*
* With a split index, write the shared index to a temporary file,
* adjust its permissions and rename it into place, then write the
* split index to the lockfile. If the temporary file for the shared
* index cannot be created, fall back to the behavior described in
* the previous paragraph.
*/
extern int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
extern int discard_index(struct index_state *);
extern void move_index_extensions(struct index_state *dst, struct index_state *src);
extern int unmerged_index(const struct index_state *);