sp_MSgetmakegenerationapplock_90 (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_MSgetmakegenerationapplock_90(int @wait_time)

MetaData:

   
create procedure sys.sp_MSgetmakegenerationapplock_90  
    @wait_time int,  
    @lock_acquired int OUTPUT  
    as  
    set nocount on  
  
    declare @retcode smallint  
    declare @lock_resource nvarchar(255)  
    declare @DbPrincipal sysname  
  
    --  Security check  
    exec @retcode = sys.sp_MSrepl_PAL_rolecheck   
    if (@retcode <> 0) or (@@error <> 0)  
            return 1  
              
    select @lock_resource = N'MSinternal_makegeneration_inprogress' +   
                convert(nvarchar(11), db_id())  
    if exists (select * from sys.database_principals where name=N'MSmerge_PAL_role' and type = 'R')  
        select @DbPrincipal = N'MSmerge_PAL_role'  
    else  
        select @DbPrincipal = N'db_owner'  
      
    --  If someone else is making generations / has just made one, exit so  
    --  that we won't deadlock  
    exec @retcode = sp_getapplock @Resource = @lock_resource,  
                                  @LockMode = N'Exclusive',  
                                  @LockOwner = N'Session',  
                                  @LockTimeout = @wait_time,  
                                  @DbPrincipal = @DbPrincipal  
  
    if @@error <> 0 or @retcode < 0  
        select @lock_acquired = 0  
    else  
        select @lock_acquired = 1  
  
    return @retcode