pSOSystem System Calls - Read

pSOS+ System Calls q_urgent
Notes
See Also
1. q_urgent() is useful when the message represents an urgent errand and must
be serviced ahead of the normally FIFO ordered messages.
2. If the caller is a task, it may be preempted as a result of this call.
3. q_urgent() sends a message to an ordinary message queue. Use
q_vurgent() to send a message to a variable length message queue.
Multiprocessor Considerations
1. If qid identifies a global queue residing on another processor node, the local
kernel internally makes an RSC to that remote node to post the input message
to that queue.
2. If a task awakened by this call does not reside on the local node, the local kernel
internally passes the message to the task's node of residence, whose pSOS+m
kernel will ready the task and give it the relayed message. Thus, a q_urgent()
call, whether it is on the local or a remote queue, may cause pSOS+m activities
on another processor node.
Callable From
■ Task.
■ ISR, if the target queue is local to the node from which the q_urgent() call is
made.
■ KI, if the target queue is local to the node from which the q_urgent() call is
made.
■ Callout, if the target queue is local to the node from which the q_urgent() call
is made.
q_receive, q_send, q_vurgent
pSOSystem System Calls 1-87
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