I updated the comments.
Status is used in a later series to track certain errno settings. This
used to be done here but was moved to a later series.
I removed the status field for now and will re add it later when we
start using it.
Thanks!
On Tue, Jul 8, 2014 at 5:00 AM, Michael Haggerty wrote:
> On 06/20/2014 04:43 PM, Ronnie Sahlberg wrote:
>> Track the status of a transaction in a new status field. Check the field for
>
> The status field is not set or used anywhere. The field that you use is
> "state".
>
>> sanity, i.e. that status must be OPEN when _commit/_create/_delete or
>> _update is called or else die(BUG:...)
>>
>> Signed-off-by: Ronnie Sahlberg
>> ---
>> refs.c | 40 +++-
>> 1 file changed, 39 insertions(+), 1 deletion(-)
>>
>> diff --git a/refs.c b/refs.c
>> index 9cb7908..8c695ba 100644
>> --- a/refs.c
>> +++ b/refs.c
>> @@ -3387,6 +3387,25 @@ struct ref_update {
>> };
>>
>> /*
>> + * Transaction states.
>> + * OPEN: The transaction is in a valid state and can accept new updates.
>> + * An OPEN transaction can be committed.
>> + * CLOSED: If an open transaction is successfully committed the state will
>> + * change to CLOSED. No further changes can be made to a CLOSED
>> + * transaction.
>> + * CLOSED means that all updates have been successfully committed
>> and
>> + * the only thing that remains is to free the completed transaction.
>> + * ERROR: The transaction has failed and is no longer committable.
>> + * No further changes can be made to a CLOSED transaction and it
>> must
>> + * be rolled back using transaction_free.
>> + */
>> +enum ref_transaction_state {
>> + REF_TRANSACTION_OPEN = 0,
>> + REF_TRANSACTION_CLOSED = 1,
>> + REF_TRANSACTION_ERROR = 2,
>> +};
>> +
>> +/*
>> * Data structure for holding a reference transaction, which can
>> * consist of checks and updates to multiple references, carried out
>> * as atomically as possible. This structure is opaque to callers.
>> @@ -3395,6 +3414,8 @@ struct ref_transaction {
>> struct ref_update **updates;
>> size_t alloc;
>> size_t nr;
>> + enum ref_transaction_state state;
>> + int status;
>
> The status field should probably be deleted.
>
>> };
>>
>> struct ref_transaction *ref_transaction_begin(struct strbuf *err)
>> @@ -3437,6 +3458,9 @@ int ref_transaction_update(struct ref_transaction
>> *transaction,
>> {
>> struct ref_update *update;
>>
>> + if (transaction->state != REF_TRANSACTION_OPEN)
>> + die("BUG: update called for transaction that is not open");
>> +
>> if (have_old && !old_sha1)
>> die("BUG: have_old is true but old_sha1 is NULL");
>>
>> @@ -3457,6 +3481,9 @@ int ref_transaction_create(struct ref_transaction
>> *transaction,
>> {
>> struct ref_update *update;
>>
>> + if (transaction->state != REF_TRANSACTION_OPEN)
>> + die("BUG: create called for transaction that is not open");
>> +
>> if (!new_sha1 || is_null_sha1(new_sha1))
>> die("BUG: create ref with null new_sha1");
>>
>> @@ -3477,6 +3504,9 @@ int ref_transaction_delete(struct ref_transaction
>> *transaction,
>> {
>> struct ref_update *update;
>>
>> + if (transaction->state != REF_TRANSACTION_OPEN)
>> + die("BUG: delete called for transaction that is not open");
>> +
>> if (have_old && !old_sha1)
>> die("BUG: have_old is true but old_sha1 is NULL");
>>
>> @@ -3532,8 +3562,13 @@ int ref_transaction_commit(struct ref_transaction
>> *transaction,
>> int n = transaction->nr;
>> struct ref_update **updates = transaction->updates;
>>
>> - if (!n)
>> + if (transaction->state != REF_TRANSACTION_OPEN)
>> + die("BUG: commit called for transaction that is not open");
>> +
>> + if (!n) {
>> + transaction->state = REF_TRANSACTION_CLOSED;
>> return 0;
>> + }
>>
>> /* Allocate work space */
>> delnames = xmalloc(sizeof(*delnames) * n);
>> @@ -3595,6 +3630,9 @@ int ref_transaction_commit(struct ref_transaction
>> *transaction,
>> clear_loose_ref_cache(&ref_cache);
>>
>> cleanup:
>> + transaction->state = ret ? REF_TRANSACTION_ERROR
>> + : REF_TRANSACTION_CLOSED;
>> +
>> for (i = 0; i < n; i++)
>> if (updates[i]->lock)
>> unlock_ref(updates[i]->lock);
>>
>
>
> --
> Michael Haggerty
> mhag...@alum.mit.edu
> http://softwareswirl.blogspot.com/
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