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sched/mqueue: Enable receiving messages on an interrupt handler

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The internal implementation of `file_mq_receive` did not allow
receiving a message from an interrupt handler. Although it is not
possible to wait for a message in an interrupt context, it is
perfectly possible to retrieve already-existing messages from the
message queue. This commit modifies file_mq_timedreceive_internal
to enable checking the message list and, if no messages exist, it
returns immediately. This enables receiving any existing messages
in an interrupt context.

Signed-off-by: Tiago Medicci Serrano <tiago.medicci@espressif.com>
This commit is contained in:
Tiago Medicci Serrano
2026-02-10 09:24:09 -03:00
committed by Matteo Golin
parent cbe13affa1
commit 9cf7d80bab
1 changed files with 8 additions and 2 deletions
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sched/mqueue/mq_receive.c
+8 -2
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@@ -145,8 +145,6 @@ ssize_t file_mq_timedreceive_internal(FAR struct file *mq, FAR char *msg,
irqstate_t flags;
ssize_t ret = 0;
DEBUGASSERT(up_interrupt_context() == false);
/* Verify the input parameters */
if (abstime && (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000))
@@ -190,6 +188,14 @@ ssize_t file_mq_timedreceive_internal(FAR struct file *mq, FAR char *msg,
return -EAGAIN;
}
/* If we are in interrupt context, return EAGAIN instead of blocking */
if (up_interrupt_context())
{
leave_critical_section(flags);
return -EAGAIN;
}
/* Wait & get the message from the message queue */
ret = nxmq_wait_receive(msgq, &mqmsg, abstime, ticks);