45 def _acquire_unique_cstr_lock(cnx):

    45 def _acquire_unique_cstr_lock(cnx):

    46     """acquire the _UNIQUE_CONSTRAINTS_LOCK for the cnx.

    46     """acquire the _UNIQUE_CONSTRAINTS_LOCK for the cnx.

    47 

    47 

    48     This lock used to avoid potential integrity pb when checking

    48     This lock used to avoid potential integrity pb when checking

    49     RQLUniqueConstraint in two different transactions, as explained in

    49     RQLUniqueConstraint in two different transactions, as explained in

    51     """

    51     """

    52     if 'uniquecstrholder' in cnx.transaction_data:

    52     if 'uniquecstrholder' in cnx.transaction_data:

    53         return

    53         return

    54     _UNIQUE_CONSTRAINTS_LOCK.acquire()

    54     _UNIQUE_CONSTRAINTS_LOCK.acquire()

    55     cnx.transaction_data['uniquecstrholder'] = True

    55     cnx.transaction_data['uniquecstrholder'] = True