wangchdo commented on code in PR #17223:
URL: https://github.com/apache/nuttx/pull/17223#discussion_r2467748558
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include/nuttx/event.h:
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@@ -73,7 +73,6 @@ struct nxevent_s
{
struct list_node list; /* Waiting list of nxevent_wait_t */
volatile nxevent_mask_t events; /* Pending Events */
- spinlock_t lock; /* Spinlock */
Review Comment:
> I think there needs to be a balance here with the SMP mode, I prefer to
use spinlock
Hi @anchao
The current event implementation uses a **spinlock plus a semaphore** — the
spinlock protects the event object, while the semaphore manages synchronization
between the event waiter and poster. However, this design feels unnecessarily
heavy. The semaphore internally relies on
**enter_critical_section()/leave_critical_section()** to protect its own
object, and its internal logic is overly complex for such a simple
synchronization scenario. In addition, the semaphore object itself consumes
extra memory.
Therefore, I decided to remove the semaphore dependency and instead directly
use **enter_critical_section()/leave_critical_section()** to both protect the
event object and synchronize between the waiter and poster. This should be more
efficient
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