ssize_t mq_receive(
mqd_t mqdes,
char *msg_ptr,
size_t msg_len,
unsigned int *msg_prio
)
{
return _POSIX_Message_queue_Receive_support(
mqdes,
msg_ptr,
msg_len,
msg_prio,
true,
WATCHDOG_NO_TIMEOUT
);
}
ssize_t mq_timedreceive(
mqd_t mqdes,
char *msg_ptr,
size_t msg_len,
unsigned int *msg_prio,
const struct timespec *abstime
)
{
Watchdog_Interval ticks;
bool do_wait = true;
POSIX_Absolute_timeout_conversion_results_t status;
/*
* POSIX requires that blocking calls with timeouts that take
* an absolute timeout must ignore issues with the absolute
* time provided if the operation would otherwise succeed.
* So we check the abstime provided, and hold on to whether it
* is valid or not. If it isn't correct and in the future,
* then we do a polling operation and convert the UNSATISFIED
* status into the appropriate error.
*
* If the status is POSIX_ABSOLUTE_TIMEOUT_INVALID,
* POSIX_ABSOLUTE_TIMEOUT_IS_IN_PAST, or POSIX_ABSOLUTE_TIMEOUT_IS_NOW,
* then we should not wait.
*/
status = _POSIX_Absolute_timeout_to_ticks( abstime, &ticks );
if ( status != POSIX_ABSOLUTE_TIMEOUT_IS_IN_FUTURE )
do_wait = false;
return _POSIX_Message_queue_Receive_support(
mqdes,
msg_ptr,
msg_len,
msg_prio,
do_wait,
ticks
);
}
