threads線程-資料下載頁
2025-08-23 14:27本頁面
【導(dǎo)讀】MS-DOS支持單用戶進(jìn)程及單線程?，F(xiàn)今的操作系統(tǒng)，如Solaris,Windows,支持多。線程是“進(jìn)程中的一條執(zhí)行路徑或線索”，或“。線程不運(yùn)行時(shí)需要保存線程的上下文信息。線程能訪問其所屬進(jìn)程所擁有的地址空間和資源。某線程更改共享的內(nèi)存變量,所有其余線程均可見。某線程打開的文件名柄其余線程都可使用。一些應(yīng)用程序可以分成若干相對獨(dú)立的部。每一部分用一個(gè)線程來實(shí)現(xiàn)。一個(gè)線程阻塞時(shí)可調(diào)度同一進(jìn)程的另一個(gè)。線程間通信無需內(nèi)核干預(yù)。3個(gè)變量:A,B,C由T1和T2兩個(gè)線程共。T2從A轉(zhuǎn)X至B(轉(zhuǎn)帳). 所有的線程管理由應(yīng)用程序通過調(diào)用ULT庫實(shí)。線程間的切換無需內(nèi)核模式下的特權(quán)指令。線程調(diào)度由特定的應(yīng)用。無線程庫，但內(nèi)核供內(nèi)核線程的編程接口
【正文】 Windows 2020 Threads ? Windows 2020 processes and threads are all implemented as objects. 均用對象的方式實(shí)現(xiàn) ? Implements the onetoone mapping. 一對一模式 ? basic thread ponents 基本的線程組件 a thread id register set separate user and kernel stacks 用戶棧與內(nèi)核棧分離 private data storage area(local variables) 私有數(shù)據(jù)存儲(chǔ)區(qū) ? A thread can be one of six states: ready(就緒 ), standby(備用 ), running(運(yùn)行 ), waiting(等待 ), transition(轉(zhuǎn)換 ), terminated(終止 ). Resource Available 資源可用 Unblock/Resume Resource Available 解阻塞且資源可用 Unblock Resource Not Available 解阻塞但資源不可用 Block/阻塞 Suspen掛起 Terminate Switch 轉(zhuǎn)換 Pick to Run 選擇運(yùn)行 Preempted 被搶占 Transition Waiting Terminated Not Runnable Runnable Ready Standby Running Windows 2020 thread states Process ID Security Descriptor Base priority Default processor affinity Quota limits Execution time I/O counters VM operation counters Exception/debugging ports Exit status Windows 2020 Process Object Attributes Thread ID Thread context Dynamic priority Base priority Thread processor affinity Thread execution time Alert status Suspension count Impersonation token Termination port Thread exit status Windows 2020 Thread Object Attributes ?Also called lightweight thread (輕線程 ) 纖程 ?Invisible(不可見的 ) to OS, similar to userlevel thread ?Win32 APIs for fiber: CreateFiber, SwitchToFiber, ConverThreadToFiber Windows NT/2020 fibers
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