[PR] sched: add spinlock to sched_note_preemption and nxsched_critmon_pree… [nuttx]

["hujun260 (via GitHub)" <gi...@apache.org>]

hujun260 opened a new pull request, #18012:
URL: https://github.com/apache/nuttx/pull/18012

   ## Summary
   
   Add spinlock synchronization to sched_note_preemption and nxsched_critmon_preemption functions. This change ensures thread-safe access to global state during preemption notification and critical section monitoring, preventing race conditions in SMP and interrupt-driven environments.
   
   ## Changes
   
   **Files modified:**
   - `drivers/note/note_driver.c`
   - `sched/sched/sched_critmonitor.c`
   
   **Key changes:**
   - Added spinlock protection (`g_note_lock`) to sched_note_preemption to guard access to the global note driver list and prevent concurrent modifications.
   - Introduced a new spinlock (`g_crimonitor_lock`) in sched_critmonitor.c to protect global state in nxsched_critmon_preemption.
   - Wrapped all critical sections in both functions with spin_lock_irqsave_notrace/spin_unlock_irqrestore_notrace.
   
   **Synchronization pattern:**
   ```c
   irqstate_t flags;
   flags = spin_lock_irqsave_notrace(&lock);
   // critical section
   spin_unlock_irqrestore_notrace(&lock, flags);


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Re: [PR] sched: add spinlock to sched_note_preemption and nxsched_critmon_pree… [nuttx]

["xiaoxiang781216 (via GitHub)" <gi...@apache.org>]

xiaoxiang781216 merged PR #18012:
URL: https://github.com/apache/nuttx/pull/18012


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