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[PATCH v2 11/33] ref_transaction_commit(): remove local variable n

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
May 6, 2016, 16:13 UTC
Message-ID
<366668e3785a18ca82587ab018ea72eb597e87ba.1462550456.git.mhagger@alum.mit.edu>
In-Reply-To
<cover.1462550456.git.mhagger@alum.mit.edu>

This microoptimization doesn't make a significant difference in speed. And it causes problems if somebody ever wants to modify the function to add updates to a transaction as part of processing it, as will happen shortly.

Make the same change in initial_ref_transaction_commit().
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs/files-backend.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 80d346f..93a94af 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3076,7 +3076,6 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 			   struct strbuf *err)
 {
 	int ret = 0, i;
-	int n = transaction->nr;
 	struct ref_update **updates = transaction->updates;
 	struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
 	struct string_list_item *ref_to_delete;
@@ -3087,13 +3086,13 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	if (transaction->state != REF_TRANSACTION_OPEN)
 		die("BUG: commit called for transaction that is not open");
 
-	if (!n) {
+	if (!transaction->nr) {
 		transaction->state = REF_TRANSACTION_CLOSED;
 		return 0;
 	}
 
 	/* Fail if a refname appears more than once in the transaction: */
-	for (i = 0; i < n; i++)
+	for (i = 0; i < transaction->nr; i++)
 		string_list_append(&affected_refnames, updates[i]->refname);
 	string_list_sort(&affected_refnames);
 	if (ref_update_reject_duplicates(&affected_refnames, err)) {
@@ -3107,7 +3106,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	 * lockfiles, ready to be activated. Only keep one lockfile
 	 * open at a time to avoid running out of file descriptors.
 	 */
-	for (i = 0; i < n; i++) {
+	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = updates[i];
 
 		if ((update->flags & REF_HAVE_NEW) &&
@@ -3178,7 +3177,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	}
 
 	/* Perform updates first so live commits remain referenced */
-	for (i = 0; i < n; i++) {
+	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = updates[i];
 
 		if (update->flags & REF_NEEDS_COMMIT) {
@@ -3197,7 +3196,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	}
 
 	/* Perform deletes now that updates are safely completed */
-	for (i = 0; i < n; i++) {
+	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = updates[i];
 
 		if (update->flags & REF_DELETING) {
@@ -3223,7 +3222,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 cleanup:
 	transaction->state = REF_TRANSACTION_CLOSED;
 
-	for (i = 0; i < n; i++)
+	for (i = 0; i < transaction->nr; i++)
 		if (updates[i]->lock)
 			unlock_ref(updates[i]->lock);
 	string_list_clear(&refs_to_delete, 0);
@@ -3243,7 +3242,6 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 				   struct strbuf *err)
 {
 	int ret = 0, i;
-	int n = transaction->nr;
 	struct ref_update **updates = transaction->updates;
 	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
 
@@ -3253,7 +3251,7 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 		die("BUG: commit called for transaction that is not open");
 
 	/* Fail if a refname appears more than once in the transaction: */
-	for (i = 0; i < n; i++)
+	for (i = 0; i < transaction->nr; i++)
 		string_list_append(&affected_refnames, updates[i]->refname);
 	string_list_sort(&affected_refnames);
 	if (ref_update_reject_duplicates(&affected_refnames, err)) {
@@ -3276,7 +3274,7 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 	if (for_each_rawref(ref_present, &affected_refnames))
 		die("BUG: initial ref transaction called with existing refs");
 
-	for (i = 0; i < n; i++) {
+	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = updates[i];
 
 		if ((update->flags & REF_HAVE_OLD) &&
@@ -3297,7 +3295,7 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 		goto cleanup;
 	}
 
-	for (i = 0; i < n; i++) {
+	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = updates[i];
 
 		if ((update->flags & REF_HAVE_NEW) &&

-- 
2.8.1
Previous: Michael HaggertyNext: Michael Haggerty
Message 12 of 51 in “Yet more preparation for reference backends”
  1. 00/33 Yet more preparation for reference backendsMichael Haggerty, May 6, 2016
  2. 01/33 t1404: demonstrate a bug resolving referencesMichael Haggerty, May 6, 2016
  3. 02/33 commit_ref(): if there is an empty dir in the way, delete itMichael Haggerty, May 6, 2016
  4. 03/33 read_raw_ref(): don't get confused by an empty directoryMichael Haggerty, May 6, 2016
  5. 04/33 safe_create_leading_directories(): improve docstringMichael Haggerty, May 6, 2016
  6. 05/33 remove_dir_recursively(): add docstringMichael Haggerty, May 6, 2016
  7. 06/33 refname_is_safe(): use skip_prefix()Michael Haggerty, May 6, 2016
  8. 07/33 refname_is_safe(): don't allow the empty stringMichael Haggerty, May 6, 2016
  9. 08/33 refname_is_safe(): insist that the refname already be normalizedMichael Haggerty, May 6, 2016
  10. 09/33 commit_ref_update(): write error message to *err, not stderrMichael Haggerty, May 6, 2016
  11. 10/33 rename_ref(): remove unneeded local variableMichael Haggerty, May 6, 2016
  12. 11/33 ref_transaction_commit(): remove local variable nMichael Haggerty, May 6, 2016
  13. 12/33 read_raw_ref(): rename flags argument to typeMichael Haggerty, May 6, 2016
  14. 13/33 read_raw_ref(): clear *type at start of functionMichael Haggerty, May 6, 2016
  15. 14/33 read_raw_ref(): rename symref argument to referentMichael Haggerty, May 6, 2016
  16. 15/33 read_raw_ref(): improve docstringMichael Haggerty, May 6, 2016
  17. 16/33 read_raw_ref(): move docstring to header fileMichael Haggerty, May 6, 2016
  18. 17/33 lock_ref_sha1_basic(): remove unneeded local variableMichael Haggerty, May 6, 2016
  19. 18/33 refs: make error messages more consistentMichael Haggerty, May 6, 2016
  20. 19/33 ref_transaction_create(): disallow recursive pruningMichael Haggerty, May 6, 2016
  21. 20/33 ref_transaction_commit(): correctly report close_ref() failureMichael Haggerty, May 6, 2016
  22. 21/33 delete_branches(): use resolve_refdup()Michael Haggerty, May 6, 2016
  23. 22/33 refs: allow log-only updatesMichael Haggerty, May 6, 2016
  24. 23/33 refs: don't dereference on renameMichael Haggerty, May 6, 2016
  25. 24/33 verify_refname_available(): adjust constness in declarationMichael Haggerty, May 6, 2016
  26. 25/33 add_update(): initialize the whole ref_updateMichael Haggerty, May 6, 2016
  27. 26/33 lock_ref_for_update(): new functionMichael Haggerty, May 6, 2016
  28. 27/33 unlock_ref(): move definition higher in the fileMichael Haggerty, May 6, 2016
  29. 28/33 ref_transaction_update(): check refname_is_safe() at a minimumMichael Haggerty, May 6, 2016
  30. 29/33 refs: resolve symbolic refs firstMichael Haggerty, May 6, 2016
  31. Jeff KingMay 12, 2016
  32. Jeff KingMay 12, 2016
  33. Michael HaggertyMay 13, 2016
  34. 29/33 refs: resolve symbolic refs firstMichael Haggerty, May 13, 2016
  35. Jeff KingMay 13, 2016
  36. Jeff KingMay 13, 2016
  37. Torsten BögershausenMay 14, 2016
  38. 30/33 lock_ref_for_update(): don't re-read non-symbolic referencesMichael Haggerty, May 6, 2016
  39. 31/33 lock_ref_for_update(): don't resolve symrefsMichael Haggerty, May 6, 2016
  40. 32/33 commit_ref_update(): remove the flags parameterMichael Haggerty, May 6, 2016
  41. 33/33 lock_ref_sha1_basic(): only handle REF_NODEREF modeMichael Haggerty, May 6, 2016
  42. David TurnerMay 9, 2016
  43. Junio C HamanoMay 9, 2016
  44. Michael HaggertyMay 9, 2016
  45. Junio C HamanoMay 9, 2016
  46. Jeff KingMay 12, 2016
  47. Junio C HamanoMay 12, 2016
  48. Junio C HamanoMay 10, 2016
  49. Michael HaggertyJun 10, 2016
  50. Junio C HamanoJun 10, 2016
  51. [ADDENDUM v4] Yet more preparation for reference backendsMichael Haggerty, Jun 13, 2016

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