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semaphore

  • In a preemptive priority based RTOS, priority inversion problem is among the major sources of deadl

    In a preemptive priority based RTOS, priority inversion problem is among the major sources of deadline violations. Priority inheritance protocol is one of the approaches to reduce priority inversion. Unfortunately, RTOS like uC/OS can’t support priority inheritance protocol since it does not allow kernel to have multiple tasks at the same priority. Although it has different ways to avoid priority inversion such as priority ceiling protocol, developers still have some difficulties in programming real time applications with it. In this paper, we redesign the uC/OS kernel to provide the ability to support round robin scheduling and implement priority inheritance semaphore on the modified kernel. As result, we port new kernel with priority inheritance semaphore to evaluation board, and evaluate the execution time of each of the kernel service as well as verify the operations of our implementation.

    標簽: priority preemptive inversion problem

    上傳時間: 2015-12-14

    上傳用戶:氣溫達上千萬的

  • μC/OS從1992年開始為人們熟悉

    μC/OS從1992年開始為人們熟悉,到現在已經發展為μC/OS-II。ΜC/OS-II最多支持56個任務,其內核為占先式,總是執行就緒態的優先級最高的任務,并支持semaphore(信號量)、Mailbox(郵箱)、Message Queue(消息隊列)等多種常用的進程間通信機制。與大多商用RTOS不同的是,μC/OS-II公開所有的源代碼,并可以免費獲得,對商業應用收取少量License費用。

    標簽: 1992 OS

    上傳時間: 2016-03-11

    上傳用戶:希醬大魔王

  • The main purpose of this project is to add a new scheduling algorithm to GeekOS and to implement a s

    The main purpose of this project is to add a new scheduling algorithm to GeekOS and to implement a simple synchronization primitive (semaphore). As you might have already noticed, GeekOS uses a simple priority based preemptive Round Robin algorithm. In this project, you will change this to a multilevel feedback scheduling. In addition, you will provide user programs with semaphores, a means to check the system s current time and a mechanism for passing command-line arguments

    標簽: scheduling algorithm implement to

    上傳時間: 2013-11-27

    上傳用戶:Late_Li

  • VC++進程線程實例:EVENT

    VC++進程線程實例:EVENT,MUTEX,MUTITHREAD,PROCESS,semaphore,THREAD,UITHREAD,WORKERTHREAD

    標簽: EVENT VC 進程 線程

    上傳時間: 2013-12-10

    上傳用戶:chongcongying

  • MINIX操作系統的內核修改補丁

    MINIX操作系統的內核修改補丁,增加了實時調度,迷你文件系統,semaphore系統服務。

    標簽: MINIX 操作系統 內核 修改

    上傳時間: 2013-12-31

    上傳用戶:zhangyigenius

  • Delphi多線程編程

    包含 等待函數WaitForSingleObject 多線程同步之 Event (事件對象) 多線程同步之 Mutex (互斥對象) 多線程同步之 semaphore (信號對象) 多線程同步之 WaitableTimer (等待定時器對象) 等等

    標簽: Delphi多線程編程

    上傳時間: 2016-02-22

    上傳用戶:西西王阿

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