szymonnnm opened a new issue #5412:
URL: https://github.com/apache/incubator-nuttx/issues/5412
Hello everyone,
I have a problem with the message queue driver. I am currently porting our
project of the current version of NuttX. So up until now, our project was using
NuttX 8.2 and I am working on making it functional with NuttX 10.2.
Anyway, in one part of our project, we want to put some data on a message
queue from an interrupt service routine.
```c
static int stm32_ubx_tp_irq_handler(int irq, FAR void *context, FAR void
*arg)
{
struct data_to_send dummy;
(....)
mq_send(mq, (char*)&dummy, sizeof(struct data_to_send), 0);
return 0;
}
```
And it worked flawlessly on NuttX 8.2, but after porting the project to
NuttX 10.2 this operation triggers assertion.
[To be specific, this is the assertion that is being
triggered](https://github.com/apache/incubator-nuttx/blob/master/sched/semaphore/sem_wait.c#L78):
```c
int nxsem_wait(FAR sem_t *sem)
{
FAR struct tcb_s *rtcb = this_task();
irqstate_t flags;
int ret = -EINVAL;
/* This API should not be called from interrupt handlers */
DEBUGASSERT(sem != NULL && up_interrupt_context() == false);
```
So, I have looked into the history of changes and it turns out that between
8.2 and 10.2 the function `nxmq_send()` has been modified. In the older
version, it was only executing the logic related to putting an item in the
message queue, but now it has to obtain the file struct instance first, and
obtaining it using regular mechanisms fails because of the fact that we are
doing it from an ISR.
The current call order is like this:
`mq_send -> nxmq_send -> fs_getfilep -> _files_semtake ->
nxsem_wait_uninterruptible -> nxsem_wait -> ASSERTION TRIGGERED`
So my question is, what is the correct way on NuttX 10.2 to send an item
using a message queue from ISR? [The documentation doesn't say anything about
it not being
possible](https://cwiki.apache.org/confluence/display/NUTTX/User+Guide#Message_Queue).
I was also not able to find an alternative API (some RTOSes I have worked with
in the past had two separate functions for that, like for example `msgq_send()`
and `msgq_send_from_isr()`)
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
