RTEMS C User's Guide
A proxy is an RTEMS data structure which resides on a
remote node and is used to represent a task which must block as
part of a remote operation. This action can occur as part of the
rtems_semaphore_obtain and
rtems_message_queue_receive directives. If the
object were local, the task's control block would be available
for modification to indicate it was blocking on a message queue
or semaphore. However, the task's control block resides only on
the same node as the task. As a result, the remote node must
allocate a proxy to represent the task until it can be readied.
The maximum number of proxies is defined in the Multiprocessor Configuration Table. Each node in a multiprocessor system may require a different number of proxies to be configured. The distribution of proxy control blocks is application dependent and is different from the distribution of tasks.
RTEMS C User's Guide
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