[erlang-questions] Looking for advice on simultaneous data modification

[Benoit Chesneau]

maybe locks could work for your case also?

https://github.com/uwiger/locks

- benoît
On Thu 18 Jun 2015 at 11:31 Daniil Churikov <ddosia@REDACTED> wrote:

> Hi Robert. This possible that main-record deletion may be initiated in the
> same time from different processes,
> but it is highly unlikely.
> On a contrary,  dependent-records will be added/modified/deleted in highly
> concurrent fashion.
>
> 2015-06-17 22:26 GMT+01:00 Robert Virding <rvirding@REDACTED>:
>
>> How do you mean "All the operations may happen in different processes
>> simultaneously."? Does it mean that many processes may initiate a record
>> deletion in parallel or does it mean that there maybe be parallel accesses
>> to the actual databases?
>>
>> Robert
>>
>>
>> On 17 June 2015 at 15:53, Daniil Churikov <ddosia@REDACTED> wrote:
>>
>>> Hello dear list. I am looking for advice to, perhaps, very common
>>> problem.
>>>
>>> I have database which does not support transactions, only CAS operations
>>> for single record.
>>> I have one-to-many relationship between 2 tables, and I need to
>>> implement cascade deletion of dependent records from table_2 when main
>>> record from table_1 was deleted. All the operations may happen in different
>>> processes simultaneously.
>>> So my intention is to do some kind of a mutex, which incorporate
>>> following properties:
>>> * when main record is in deletion-state, every other action on main
>>> and/or dependent record should wait until it will be deleted;
>>> * if main record is in normal-state, all dependencies may be modified
>>> without any strict order.
>>>
>>> Is there any library in the wild which allow me to do this kind of mutex?
>>> Maybe I have chosen wrong approach? Any suggestions?
>>>
>>> Thanks!
>>>
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>>>
>>
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