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Most times, when you are worried about corruption due to two processes happening simultaneously, it is common to lock down the thread when the first process begins.In this case, I would design it so that when someone is making a withdrawal or deposit on the account, it would lock down the account (typically using a mutex of some sort) and limit the other user to only being able to view the balance or other things that don't actually change the state of the account. Also, for end user knowledge/experience, I would display a warning stating that this account is in use at another location and therefore, the balance may not be up to date. Once the first person was done, the account would be released so that the other user could then conduct their business
- Ken August 13, 2013