pcb廠家：PCB的組成部分

PCB( Printed Circuit Board)，中(zhong)文名稱(cheng)為(wei)印(yin)制電(dian)(dian)路板，又稱(cheng)印(yin)刷(shua)線(xian)路板，是重要的(de)(de)電(dian)(dian)子(zi)(zi)部件(jian)(jian)，是電(dian)(dian)子(zi)(zi)元器件(jian)(jian)的(de)(de)支撐體，是電(dian)(dian)子(zi)(zi)元器件(jian)(jian)電(dian)(dian)氣連接的(de)(de)載體。由(you)于它是采用電(dian)(dian)子(zi)(zi)印(yin)刷(shua)術制作(zuo)的(de)(de)，故被稱(cheng)為(wei)“印(yin)刷(shua)”電(dian)(dian)路板。

由(you)三部分(fen)組(zu)成PCB、有關程(cheng)(cheng)(cheng)(cheng)(cheng)序(xu)(xu)段和(he)該程(cheng)(cheng)(cheng)(cheng)(cheng)序(xu)(xu)段對(dui)其進(jin)(jin)(jin)(jin)(jin)(jin)行操作的(de)(de)數(shu)(shu)據(ju)結構(gou)集(ji)。在Unix或類Unix系統(tong)中，進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)是(shi)由(you)進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)控制(zhi)塊(kuai)，進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)執行的(de)(de)程(cheng)(cheng)(cheng)(cheng)(cheng)序(xu)(xu)，進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)執行時所用數(shu)(shu)據(ju)，進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)運行使用的(de)(de)工作區(qu)組(zu)成。其中進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)控制(zhi)塊(kuai)是(shi)***重(zhong)要的(de)(de)一部分(fen)。進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)控制(zhi)塊(kuai)是(shi)用來(lai)描述進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)的(de)(de)當前狀態(tai)，本(ben)身特性(xing)的(de)(de)數(shu)(shu)據(ju)結構(gou)，是(shi)進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)中組(zu)成的(de)(de)***關鍵部分(fen)，其中含(han)有描述進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)信息(xi)和(he)控制(zhi)信息(xi)，是(shi)進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)的(de)(de)集(ji)中特性(xing)反(fan)映，是(shi)操作系統(tong)對(dui)進(jin)(jin)(jin)(jin)(jin)(jin)程(cheng)(cheng)(cheng)(cheng)(cheng)具體進(jin)(jin)(jin)(jin)(jin)(jin)行識(shi)別和(he)控制(zhi)的(de)(de)依據(ju)。

PCB一般包括：

1.程(cheng)序(xu)ID(PID、進(jin)程(cheng)句柄)：它是***的，一(yi)個進(jin)程(cheng)都***對(dui)應一(yi)個PID。PID一(yi)般是整型(xing)數字

2.特征信(xin)息：一般分系(xi)統進(jin)程(cheng)、用戶進(jin)程(cheng)、或者內核進(jin)程(cheng)等(deng)3.進(jin)程(cheng)狀態：運行、就緒、阻塞，表(biao)示(shi)進(jin)程(cheng)現的運行情況(kuang)4.優(you)先級：表(biao)示(shi)獲得(de)CPU控(kong)制權的優(you)先級大(da)小

5.通(tong)信(xin)(xin)(xin)信(xin)(xin)(xin)息：進程(cheng)之(zhi)間的(de)通(tong)信(xin)(xin)(xin)關系的(de)反映，由于操作系統會提供通(tong)信(xin)(xin)(xin)信(xin)(xin)(xin)道(dao)

6.現場保護(hu)區：保護(hu)阻塞的進(jin)程用(yong)

7.資源需求、分配(pei)控制信息(xi)

8.進程(cheng)實體(ti)信息，指明程(cheng)序路(lu)徑(jing)和名稱(cheng)，進程(cheng)數(shu)據在(zai)物理(li)內存(cun)還(huan)是在(zai)交換分區(分頁)中

9.其他信(xin)息：工(gong)作(zuo)單位(wei)，工(gong)作(zuo)區，文(wen)件(jian)信(xin)息等(deng)