Description: 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. Platform: |
Size: 135878 |
Author:刘天宏 |
Hits:
Description: ucosii小实验任务2优先级天花板，可以帮助学习嵌入式操作系统-ucosii two small experimental task priority ceiling can help embedded operating system Platform: |
Size: 108544 |
Author:yz |
Hits:
Description: 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.-In a preemptive priority based RTOS, priority inversionproblem is among the major sources of deadlineviolations. Priority inheritance protocol is one of theapproaches to reduce priority inversion. Unfortunately, RTOS like uC/OS can t support priority inheritanceprotocol since it does not allow kernel to have multipletasks at the same priority. Although it has different waysto avoid priority inversion such as priority ceilingprotocol, developers still have some difficulties inprogramming real time applications with it. In this paper, we redesign the uC/OS kernel to provide the ability tosupport round robin scheduling and implement priorityinheritance semaphore on the modified kernel. As result, we port new kernel with priority inheritance semaphore toevaluation board, and evaluate the execution time of eachof the kernel service as well as verify the operations ofour implementation. Platform: |
Size: 135168 |
Author:刘天宏 |
Hits:
Description: uC/OS优先级翻转演示.这个程序演示基本的天花板优先级的解决。程序启动具有三个不同优先级的任务，每个任务请求，获得
* ，释放互斥信号量，完成一系列动作。-uC/OS Priority Inversion presentation. This program demonstrates the basic solution to the ceiling priority. Program starts with three different priority tasks, each task request, access*, release mutex semaphores, to complete a series of moves. Platform: |
Size: 2048 |
Author:leo |
Hits:
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