The data structure used to contain a process's software context. The operation system defines a software PCB for every process when the process is created. The software PCB includes the following kinds of information about the process: current state; storage address if it is swapped out of memory; unique identification of the process; and address of the process header (which contains the hardware PCB). The software PCB resides in system region virtual address space. It is not swapped with a process.; 一種數(shù)據(jù)結(jié)構(gòu),用于容納進程的前后關(guān)系。在進程建立時,操作系統(tǒng)為每一個進程定義一個軟件進程控制 塊(PCB)。軟件PCB中含有該進程的下列各類信息: 當(dāng)前狀態(tài)、換出內(nèi)存時的存儲器 地址、進程的唯一標識符,以及進程標題(含有硬件進程控制塊)的地址。軟件PCB駐在系統(tǒng) 區(qū)虛地址空間,它不與進程進行交換。Software Process Control Block的縮寫。