RT-Thread / RT-Thread/rt-thread
[Bug] finsh线程一直占用cpu,导致低优先级任务无法执行
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- Dominant language
- C
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Description
RT-Thread Version
5.2.1
Hardware Type/Architectures
at32
Develop Toolchain
Other
Describe the bug
1.at32驱动里选择DMA方式
2.串口驱动选serial v2
3.finsh启动后，优先级更低的线程无法被调度
4.目前初步分析原因，finsh调用read系统调用获取串口数据，read是非阻塞的，导致问题发生。
5.现在read调用后,如果无数据，则增加rt_thread_mdelay(1).
Other additional context
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the issue on AT32 with DMA enabled and the serial v2 driver, then trace the finsh thread's read path when no serial data is available. Confirm that lower-priority threads are scheduled normally after the fix, including the no-input case described in the report.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- embedded-iot, operating-systems
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100