/ BBS in a Box 10 / BBS In A Box Volume X (AMUG) (January 1994).bin / Files / Prog / U-Z / VideoToolBox.cpt / VideoToolboxSources / SetPriority.c

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+--------+-------------------------+-------------------------+--------+--------+
|00000000| 00 0d 53 65 74 50 72 69 | 6f 72 69 74 79 2e 63 00 |..SetPri|ority.c.|
|00000010| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000020| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000030| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000040| 00 54 45 58 54 4b 41 48 | 4c 01 00 00 00 00 00 00 |.TEXTKAH|L.......|
|00000050| 00 00 00 00 00 09 36 00 | 00 01 7e a7 af 5f 9f a7 |......6.|..~.._..|
|00000060| af 5f 9f 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |._......|........|
|00000070| 00 00 00 00 00 00 00 00 | 00 00 81 81 97 cc 00 00 |........|........|
|00000080| 2f 2a 0d 53 65 74 50 72 | 69 6f 72 69 74 79 2e 63 |/*.SetPr|iority.c|
|00000090| 0d 0d 63 68 61 72 20 70 | 72 69 6f 72 69 74 79 3d |..char p|riority=|
|000000a0| 37 3b 0d 0d 53 77 61 70 | 50 72 69 6f 72 69 74 79 |7;..Swap|Priority|
|000000b0| 28 26 70 72 69 6f 72 69 | 74 79 29 3b 0d 2f 2f 20 |(&priori|ty);.// |
|000000c0| 64 6f 20 68 69 67 68 20 | 70 72 69 6f 72 69 74 79 |do high |priority|
|000000d0| 20 73 74 75 66 66 20 68 | 65 72 65 0d 53 77 61 70 | stuff h|ere.Swap|
|000000e0| 50 72 69 6f 72 69 74 79 | 28 26 70 72 69 6f 72 69 |Priority|(&priori|
|000000f0| 74 79 29 3b 0d 0d 47 65 | 74 20 61 6e 64 20 73 65 |ty);..Ge|t and se|
|00000100| 74 20 74 68 65 20 70 72 | 6f 63 65 73 73 6f 72 20 |t the pr|ocessor |
|00000110| 70 72 69 6f 72 69 74 79 | 2e 20 28 54 68 69 73 20 |priority|. (This |
|00000120| 69 73 20 6d 6f 64 65 6c | 65 64 20 61 66 74 65 72 |is model|ed after|
|00000130| 20 53 77 61 70 4d 4d 55 | 4d 6f 64 65 2e 29 20 54 | SwapMMU|Mode.) T|
|00000140| 68 65 0d 4d 61 63 69 6e | 74 6f 73 68 20 6f 70 65 |he.Macin|tosh ope|
|00000150| 72 61 74 69 6e 67 20 73 | 79 73 74 65 6d 20 6e 6f |rating s|ystem no|
|00000160| 72 6d 61 6c 6c 79 20 6c | 65 61 76 65 73 20 74 68 |rmally l|eaves th|
|00000170| 65 20 70 72 6f 63 65 73 | 73 6f 72 20 70 72 69 6f |e proces|sor prio|
|00000180| 72 69 74 79 20 61 74 20 | 7a 65 72 6f 2c 0d 61 6c |rity at |zero,.al|
|00000190| 6c 6f 77 69 6e 67 20 61 | 6c 6c 20 69 6e 74 65 72 |lowing a|ll inter|
|000001a0| 72 75 70 74 73 2e 20 59 | 6f 75 20 63 61 6e 20 74 |rupts. Y|ou can t|
|000001b0| 65 6d 70 6f 72 61 72 69 | 6c 79 20 62 6c 6f 63 6b |emporari|ly block|
|000001c0| 20 69 6e 74 65 72 72 75 | 70 74 73 20 62 79 20 72 | interru|pts by r|
|000001d0| 61 69 73 69 6e 67 20 74 | 68 65 0d 70 72 6f 63 65 |aising t|he.proce|
|000001e0| 73 73 6f 72 20 70 72 69 | 6f 72 69 74 79 2e 20 54 |ssor pri|ority. T|
|000001f0| 68 65 20 68 69 67 68 65 | 73 74 20 6c 65 76 65 6c |he highe|st level|
|00000200| 20 69 73 20 37 2c 20 62 | 6c 6f 63 6b 69 6e 67 20 | is 7, b|locking |
|00000210| 61 6c 6c 20 69 6e 74 65 | 72 72 75 70 74 73 2e 20 |all inte|rrupts. |
|00000220| 54 68 69 73 20 69 73 0d | 75 73 65 66 75 6c 20 66 |This is.|useful f|
|00000230| 6f 72 20 74 69 6d 65 20 | 63 72 69 74 69 63 61 6c |or time |critical|
|00000240| 20 74 61 73 6b 73 2c 20 | 73 75 63 68 20 61 73 20 | tasks, |such as |
|00000250| 72 75 6e 6e 69 6e 67 20 | 76 69 64 65 6f 20 61 6e |running |video an|
|00000260| 69 6d 61 74 69 6f 6e 73 | 2c 20 77 68 65 72 65 20 |imations|, where |
|00000270| 79 6f 75 72 0d 70 72 69 | 6d 61 72 79 20 63 6f 6e |your.pri|mary con|
|00000280| 63 65 72 6e 20 69 73 20 | 76 69 64 65 6f 20 74 69 |cern is |video ti|
|00000290| 6d 69 6e 67 2c 20 61 6e | 64 20 79 6f 75 27 72 65 |ming, an|d you're|
|000002a0| 20 77 69 6c 6c 69 6e 67 | 20 74 6f 20 6d 69 73 73 | willing| to miss|
|000002b0| 20 41 70 70 6c 65 54 61 | 6c 6b 20 61 6e 64 0d 6b | AppleTa|lk and.k|
|000002c0| 65 79 62 6f 61 72 64 20 | 65 76 65 6e 74 73 2e 20 |eyboard |events. |
|000002d0| 4e 6f 74 65 20 74 68 61 | 74 20 77 68 69 6c 65 20 |Note tha|t while |
|000002e0| 74 68 65 20 70 72 6f 63 | 65 73 73 6f 72 20 70 72 |the proc|essor pr|
|000002f0| 69 6f 72 69 74 79 20 69 | 73 20 68 69 67 68 20 74 |iority i|s high t|
|00000300| 68 65 20 6b 65 79 62 6f | 61 72 64 20 61 6e 64 0d |he keybo|ard and.|
|00000310| 6d 6f 75 73 65 20 77 69 | 6c 6c 20 62 65 20 64 65 |mouse wi|ll be de|
|00000320| 61 64 2c 20 73 6f 20 74 | 68 61 74 20 69 74 20 69 |ad, so t|hat it i|
|00000330| 73 20 65 73 73 65 6e 74 | 69 61 6c 20 74 68 61 74 |s essent|ial that|
|00000340| 20 79 6f 75 72 20 70 72 | 6f 67 72 61 6d 20 6c 6f | your pr|ogram lo|
|00000350| 77 65 72 20 69 74 20 62 | 61 63 6b 20 64 6f 77 6e |wer it b|ack down|
|00000360| 0d 74 6f 20 61 6c 6c 6f | 77 20 74 68 65 20 75 73 |.to allo|w the us|
|00000370| 65 72 20 74 6f 20 72 65 | 67 61 69 6e 20 63 6f 6e |er to re|gain con|
|00000380| 74 72 6f 6c 2e 0d 0d 54 | 68 65 20 69 6e 6c 69 6e |trol...T|he inlin|
|00000390| 65 20 66 75 6e 63 74 69 | 6f 6e 73 20 47 65 74 53 |e functi|ons GetS|
|000003a0| 74 61 74 75 73 52 65 67 | 69 73 74 65 72 28 29 20 |tatusReg|ister() |
|000003b0| 61 6e 64 20 53 65 74 53 | 74 61 74 75 73 52 65 67 |and SetS|tatusReg|
|000003c0| 69 73 74 65 72 28 29 20 | 6f 6e 6c 79 20 77 6f 72 |ister() |only wor|
|000003d0| 6b 0d 62 65 63 61 75 73 | 65 20 74 68 65 20 70 72 |k.becaus|e the pr|
|000003e0| 6f 63 65 73 73 6f 72 20 | 69 73 20 69 6e 20 73 75 |ocessor |is in su|
|000003f0| 70 65 72 76 69 73 6f 72 | 20 73 74 61 74 65 2e 20 |pervisor| state. |
|00000400| 41 73 20 6f 66 20 74 68 | 69 73 20 77 72 69 74 69 |As of th|is writi|
|00000410| 6e 67 20 74 68 65 20 4d | 61 63 69 6e 74 6f 73 68 |ng the M|acintosh|
|00000420| 0d 6f 70 65 72 61 74 69 | 6e 67 20 73 79 73 74 65 |.operati|ng syste|
|00000430| 6d 20 28 75 70 20 74 6f | 20 37 2e 30 29 20 61 6c |m (up to| 7.0) al|
|00000440| 77 61 79 73 20 6c 65 61 | 76 65 73 20 74 68 65 20 |ways lea|ves the |
|00000450| 36 38 30 78 30 20 70 72 | 6f 63 65 73 73 6f 72 20 |680x0 pr|ocessor |
|00000460| 69 6e 20 73 75 70 65 72 | 76 69 73 6f 72 0d 73 74 |in super|visor.st|
|00000470| 61 74 65 2e 20 48 6f 77 | 65 76 65 72 2c 20 41 70 |ate. How|ever, Ap|
|00000480| 70 6c 65 20 68 61 73 20 | 77 61 72 6e 65 64 20 74 |ple has |warned t|
|00000490| 68 61 74 20 74 68 69 73 | 20 6d 61 79 20 63 68 61 |hat this| may cha|
|000004a0| 6e 67 65 20 69 6e 20 66 | 75 74 75 72 65 20 72 65 |nge in f|uture re|
|000004b0| 6c 65 61 73 65 73 20 6f | 66 20 74 68 65 0d 6f 70 |leases o|f the.op|
|000004c0| 65 72 61 74 69 6e 67 20 | 73 79 73 74 65 6d 2e 20 |erating |system. |
|000004d0| 49 6e 20 74 68 65 20 66 | 75 74 75 72 65 2c 20 74 |In the f|uture, t|
|000004e0| 68 65 72 65 66 6f 72 65 | 2c 20 69 74 20 6d 61 79 |herefore|, it may|
|000004f0| 20 62 65 20 6e 65 63 65 | 73 73 61 72 79 20 74 6f | be nece|ssary to|
|00000500| 20 77 72 69 74 65 20 6d | 6f 72 65 0d 65 6c 61 62 | write m|ore.elab|
|00000510| 6f 72 61 74 65 20 76 65 | 72 73 69 6f 6e 73 20 6f |orate ve|rsions o|
|00000520| 66 20 74 68 65 73 65 20 | 74 77 6f 20 72 6f 75 74 |f these |two rout|
|00000530| 69 6e 65 73 2c 20 62 65 | 67 67 69 6e 67 20 74 68 |ines, be|gging th|
|00000540| 65 20 6f 70 65 72 61 74 | 69 6e 67 20 73 79 73 74 |e operat|ing syst|
|00000550| 65 6d 27 73 0d 70 65 72 | 6d 69 73 73 69 6f 6e 20 |em's.per|mission |
|00000560| 74 6f 20 64 6f 20 74 68 | 69 73 2c 20 73 69 6e 63 |to do th|is, sinc|
|00000570| 65 20 69 74 20 63 61 6e | 6e 6f 74 20 62 65 20 64 |e it can|not be d|
|00000580| 6f 6e 65 20 77 68 69 6c | 65 20 74 68 65 20 70 72 |one whil|e the pr|
|00000590| 6f 63 65 73 73 6f 72 20 | 69 73 20 69 6e 20 75 73 |ocessor |is in us|
|000005a0| 65 72 0d 73 74 61 74 65 | 2e 0d 0d 48 49 53 54 4f |er.state|...HISTO|
|000005b0| 52 59 3a 0d 31 39 38 39 | 3f 09 64 67 70 09 77 72 |RY:.1989|?.dgp.wr|
|000005c0| 6f 74 65 20 69 74 0d 38 | 2f 31 2f 39 31 09 64 67 |ote it.8|/1/91.dg|
|000005d0| 70 09 69 6e 74 72 6f 64 | 75 63 65 64 20 74 68 65 |p.introd|uced the|
|000005e0| 20 69 6e 6c 69 6e 65 20 | 66 75 6e 63 74 69 6f 6e | inline |function|
|000005f0| 73 20 61 73 20 61 20 77 | 61 79 20 74 6f 20 69 73 |s as a w|ay to is|
|00000600| 6f 6c 61 74 65 20 74 68 | 65 20 6d 61 63 68 69 6e |olate th|e machin|
|00000610| 65 20 63 6f 64 65 0d 09 | 09 09 70 61 72 74 2c 20 |e code..|..part, |
|00000620| 61 6e 64 20 74 6f 20 6d | 61 6b 65 20 69 74 20 63 |and to m|ake it c|
|00000630| 6f 6d 70 61 74 69 62 6c | 65 20 77 69 74 68 20 4d |ompatibl|e with M|
|00000640| 50 57 20 43 20 61 73 20 | 77 65 6c 6c 20 61 73 20 |PW C as |well as |
|00000650| 54 48 49 4e 4b 20 43 2e | 0d 38 2f 36 2f 39 31 09 |THINK C.|.8/6/91.|
|00000660| 64 67 70 09 66 69 78 65 | 64 20 64 65 66 69 6e 69 |dgp.fixe|d defini|
|00000670| 74 69 6f 6e 20 6f 66 20 | 47 65 74 53 74 61 74 75 |tion of |GetStatu|
|00000680| 73 52 65 67 69 73 74 65 | 72 28 29 20 74 6f 20 6d |sRegiste|r() to m|
|00000690| 61 6b 65 20 69 74 20 61 | 20 6c 65 67 61 6c 20 70 |ake it a| legal p|
|000006a0| 72 6f 74 6f 74 79 70 65 | 2e 0d 32 2f 31 35 2f 39 |rototype|..2/15/9|
|000006b0| 33 09 64 67 70 09 61 64 | 64 65 64 20 53 77 61 70 |3.dgp.ad|ded Swap|
|000006c0| 50 72 69 6f 72 69 74 79 | 28 29 2e 0d 2a 2f 0d 23 |Priority|()..*/.#|
|000006d0| 69 6e 63 6c 75 64 65 20 | 22 56 69 64 65 6f 54 6f |include |"VideoTo|
|000006e0| 6f 6c 62 6f 78 2e 68 22 | 0d 0d 2f 2a 20 54 68 65 |olbox.h"|../* The|
|000006f0| 73 65 20 61 72 65 20 69 | 6e 6c 69 6e 65 20 66 75 |se are i|nline fu|
|00000700| 6e 63 74 69 6f 6e 73 2e | 20 54 68 69 73 20 66 6f |nctions.| This fo|
|00000710| 72 6d 61 74 20 69 73 20 | 73 75 70 70 6f 72 74 65 |rmat is |supporte|
|00000720| 64 20 62 79 20 62 6f 74 | 68 20 54 48 49 4e 4b 20 |d by bot|h THINK |
|00000730| 61 6e 64 20 4d 50 57 20 | 43 20 2a 2f 0d 70 61 73 |and MPW |C */.pas|
|00000740| 63 61 6c 20 73 68 6f 72 | 74 20 47 65 74 53 74 61 |cal shor|t GetSta|
|00000750| 74 75 73 52 65 67 69 73 | 74 65 72 28 76 6f 69 64 |tusRegis|ter(void|
|00000760| 29 3d 7b 30 78 34 30 64 | 37 7d 3b 09 09 09 2f 2a |)={0x40d|7};.../*|
|00000770| 20 4d 4f 56 45 2e 57 20 | 53 52 2c 28 53 50 29 09 | MOVE.W |SR,(SP).|
|00000780| 2a 2f 0d 70 61 73 63 61 | 6c 20 76 6f 69 64 20 53 |*/.pasca|l void S|
|00000790| 65 74 53 74 61 74 75 73 | 52 65 67 69 73 74 65 72 |etStatus|Register|
|000007a0| 28 73 68 6f 72 74 20 73 | 74 61 74 75 73 29 3d 7b |(short s|tatus)={|
|000007b0| 30 78 34 36 64 66 7d 3b | 09 2f 2a 20 4d 4f 56 45 |0x46df};|./* MOVE|
|000007c0| 2e 57 20 28 53 50 29 2b | 2c 53 52 09 2a 2f 0d 0d |.W (SP)+|,SR.*/..|
|000007d0| 76 6f 69 64 20 53 65 74 | 50 72 69 6f 72 69 74 79 |void Set|Priority|
|000007e0| 28 69 6e 74 20 69 29 0d | 7b 0d 09 72 65 67 69 73 |(int i).|{..regis|
|000007f0| 74 65 72 20 73 68 6f 72 | 74 20 73 74 61 74 75 73 |ter shor|t status|
|00000800| 3b 0d 0d 09 69 20 26 3d | 20 37 3b 0d 09 69 20 3c |;...i &=| 7;..i <|
|00000810| 3c 3d 20 38 3b 0d 09 73 | 74 61 74 75 73 3d 47 65 |<= 8;..s|tatus=Ge|
|00000820| 74 53 74 61 74 75 73 52 | 65 67 69 73 74 65 72 28 |tStatusR|egister(|
|00000830| 29 3b 0d 09 73 74 61 74 | 75 73 20 26 3d 20 7e 30 |);..stat|us &= ~0|
|00000840| 78 37 30 30 3b 09 2f 2a | 20 63 6c 65 61 72 20 74 |x700;./*| clear t|
|00000850| 68 65 20 70 72 69 6f 72 | 69 74 79 20 62 69 74 73 |he prior|ity bits|
|00000860| 20 2a 2f 0d 09 73 74 61 | 74 75 73 20 7c 3d 20 69 | */..sta|tus |= i|
|00000870| 3b 09 09 2f 2a 20 69 6e | 73 65 72 74 20 6e 65 77 |;../* in|sert new|
|00000880| 20 70 72 69 6f 72 69 74 | 79 20 62 69 74 73 20 2a | priorit|y bits *|
|00000890| 2f 0d 09 53 65 74 53 74 | 61 74 75 73 52 65 67 69 |/..SetSt|atusRegi|
|000008a0| 73 74 65 72 28 73 74 61 | 74 75 73 29 3b 0d 7d 0d |ster(sta|tus);.}.|
|000008b0| 0d 69 6e 74 20 47 65 74 | 50 72 69 6f 72 69 74 79 |.int Get|Priority|
|000008c0| 28 76 6f 69 64 29 0d 7b | 0d 09 72 65 67 69 73 74 |(void).{|..regist|
|000008d0| 65 72 20 73 68 6f 72 74 | 20 73 74 61 74 75 73 3b |er short| status;|
|000008e0| 0d 0d 09 73 74 61 74 75 | 73 3d 47 65 74 53 74 61 |...statu|s=GetSta|
|000008f0| 74 75 73 52 65 67 69 73 | 74 65 72 28 29 3b 0d 09 |tusRegis|ter();..|
|00000900| 73 74 61 74 75 73 20 3e | 3e 3d 20 38 3b 0d 09 73 |status >|>= 8;..s|
|00000910| 74 61 74 75 73 20 26 3d | 20 37 3b 0d 09 72 65 74 |tatus &=| 7;..ret|
|00000920| 75 72 6e 20 73 74 61 74 | 75 73 3b 0d 7d 0d 0d 76 |urn stat|us;.}..v|
|00000930| 6f 69 64 20 53 77 61 70 | 50 72 69 6f 72 69 74 79 |oid Swap|Priority|
|00000940| 28 63 68 61 72 20 2a 70 | 72 69 6f 72 69 74 79 29 |(char *p|riority)|
|00000950| 0d 7b 0d 09 63 68 61 72 | 20 6f 6c 64 50 72 69 6f |.{..char| oldPrio|
|00000960| 72 69 74 79 3b 0d 09 0d | 09 6f 6c 64 50 72 69 6f |rity;...|.oldPrio|
|00000970| 72 69 74 79 3d 47 65 74 | 50 72 69 6f 72 69 74 79 |rity=Get|Priority|
|00000980| 28 29 3b 0d 09 53 65 74 | 50 72 69 6f 72 69 74 79 |();..Set|Priority|
|00000990| 28 2a 70 72 69 6f 72 69 | 74 79 29 3b 0d 09 2a 70 |(*priori|ty);..*p|
|000009a0| 72 69 6f 72 69 74 79 3d | 6f 6c 64 50 72 69 6f 72 |riority=|oldPrior|
|000009b0| 69 74 79 3b 0d 7d 00 00 | 00 00 00 00 00 00 00 00 |ity;.}..|........|
|000009c0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|000009d0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|000009e0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|000009f0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000a00| 00 00 01 00 00 00 01 4c | 00 00 00 4c 00 00 00 32 |.......L|...L...2|
|00000a10| 74 6f 2e 68 3e 09 09 2f | 2a 20 6f 70 74 69 6f 6e |to.h>../|* option|
|00000a20| 61 6c 20 2a 2f 0d 23 69 | 6e 63 6c 75 64 65 20 22 |al */.#i|nclude "|
|00000a30| 0d 53 65 74 50 72 69 6f | 72 69 74 79 2e 63 02 00 |.SetPrio|rity.c..|
|00000a40| 00 00 54 45 58 54 4b 41 | 48 4c 00 00 00 00 00 00 |..TEXTKA|HL......|
|00000a50| 00 00 54 45 58 54 4b 41 | 48 4c 00 00 00 00 00 00 |..TEXTKA|HL......|
|00000a60| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000a70| 00 00 a7 e5 d5 ce 00 00 | 00 00 00 00 01 7e 65 72 |........|.....~er|
|00000a80| 3b 0d 0d 09 61 73 6d 20 | 7b 6d 6f 76 65 20 73 72 |;...asm |{move sr|
|00000a90| 2c 73 74 61 74 75 73 52 | 65 67 69 73 74 65 72 7d |,statusR|egister}|
|00000aa0| 0d 09 69 20 26 3d 20 37 | 3b 0d 09 73 74 61 74 75 |..i &= 7|;..statu|
|00000ab0| 73 52 65 67 69 73 74 65 | 72 20 26 3d 20 7e 30 78 |sRegiste|r &= ~0x|
|00000ac0| 37 30 30 3b 09 2f 2a 20 | 63 6c 65 61 72 20 70 72 |700;./* |clear pr|
|00000ad0| 69 6f 72 69 74 79 20 62 | 69 74 73 20 2a 2f 0d 09 |iority b|its */..|
|00000ae0| 73 74 61 74 75 73 52 65 | 67 69 73 74 65 72 20 7c |statusRe|gister ||
|00000af0| 3d 20 69 2a 30 78 31 30 | 30 3b 09 2f 2a 20 69 6e |= i*0x10|0;./* in|
|00000b00| 00 00 00 48 00 09 4d 6f | 6e 61 63 6f 00 00 00 1d |...H..Mo|naco....|
|00000b10| 00 00 00 38 7f ff 00 1e | 02 4f 02 50 7f ff 01 19 |...8....|.O.P....|
|00000b20| ff ff 00 08 7f ff 00 06 | 00 04 00 2a 00 03 01 dd |........|...*....|
|00000b30| 02 7d 01 2c 00 00 01 dd | 02 3d a4 aa 9c f4 00 00 |.}.,....|.=......|
|00000b40| 00 36 00 00 02 07 00 00 | 00 00 01 00 00 00 01 00 |.6......|........|
|00000b50| 00 00 01 4c 00 00 00 4c | 00 00 00 32 00 5d 6f a8 |...L...L|...2.]o.|
|00000b60| 08 d2 00 00 00 1c 00 32 | 00 00 4d 50 53 52 00 00 |.......2|..MPSR..|
|00000b70| 00 0a 03 ed ff ff 00 00 | 00 00 00 5f 16 f8 00 00 |........|..._....|
+--------+-------------------------+-------------------------+--------+--------+