u Tin Ca Thread ( Thread Priority )
u Tin Ca Tiu Trnh( Thread Priority )Cho php h iu hnh quyt nh
:Thi gian s dng CPU ca thread C hi nhn quyn s dng CPU
Tiu trnh l mt thnh phn n v ca tin trnh c th thc hin cc ch th ng
vi mt on m no ca chng trnh.
H iu hnh Windows cho php cc tiu trnh hat ng c lp v t chc iu phi
(lp lch tin trnh) CPU cc tiu trnh hat ng ng thi.
Mi tiu trnh c th c 1 trong 3 trng thi: Running, Ready,
Blocked.
1 u Tin Ca Tiu Trnh ( Thread Priority ) ( tt )Tiu trnh c th nhn
mt trong cc gi tr u tin bt k di y ty theo cch ci t ca lp trnh vin
:HighestAboveNormalNormalBelowNormalLowestH iu hnh khng quan tm ti
u tin ca mt Tiu Trnh .Normal l mc nh 2Mi tiu trnh c 1 u tin c xc lp
t 0 (thp nht) n 31 (cao nht), gi tr ny gi l Base PriorityBase
Priority l gi tr u tin ca tiu trnh tnh trn ton h thngBase Priority
c xc nh bi: u tin ca tin trnh cha nMc u tin ca tiu trnh bn trong
tin trnh. u Tin Ca Tiu Trnh ( Thread Priority ) ( tt )3 u Tin Ca
Tiu Trnh ( Thread Priority ) ( tt )
THREAD_PRIORITY_LOWEST (-2): thp hn 2 im so vi u tin
NORMALTHREAD_PRIORITY_BELOW_NORMAL (-1): thp hn 1 im so vi u tin
NORMALTHREAD_PRIORITY_NORMAL: u tin ngang vi u tin ca tin
trnhTHREAD_PRIORITY_ABOVE_NORMAL (+1): cao hn 1 im so vi u tin
NORMALTHREAD_PRIORITY_HIGHEST (+2): cao hn 2 im so vi u tin
NORMAL
u Tin Ca Tiu Trnh ( Thread Priority ) ( tt )
MC U TIN u Tin Ca Tiu Trnh ( Thread Priority ) ( tt )
MC U TIN (TT) u Tin Ca Tiu Trnh ( Thread Priority ) ( tt )Nhn xt
: Nu qu trnh ny l hon ton l nn ( background )v khng phi l qu quan
trng :
Nu qu trnh ny cn phi xy ra , nhng thi gian khng quan trng :
Nu qu trnh ny cng quan trng nh mi th khc :Lawest
BelowNormal.
Nomal .Nh i vi s khc bit , iu ny ph thuc vo code running v nhng
g OS quyt nh lm vi cc u tin , n khng cn phi lng nghe mt trong nhng
ci m bn thit lp.7 u Tin Ca Tiu Trnh ( Thread Priority ) ( tt )V
d:
namespacetest{classProgram {staticvoidMain(string[] args)
{Threadth =newThread(WriteY); th.Start();for(inti = 0; i
