const TickType_t xTicksToWait
configUSE_QUEUE_SETS must be set to 1 in FreeRTOSConfig.h for the xQueueSelectFromSet() API function to be available.
xQueueSelectFromSet() selects from the members of a queue set a queue or
semaphore that either contains data (in the case of a queue) or is available
to take (in the case of a semaphore). xQueueSelectFromSet() effectively
allows a task to block (pend) on a read operation on all the queues and
semaphores in a queue set simultaneously.
There are simpler alternatives to using queue sets. See the
Blocking on Multiple Objects page for
Blocking on a queue set that contains a mutex will not cause the
mutex holder to inherit the priority of the blocked task.
A receive (in the case of a queue) or take (in the case of a
semaphore) operation must not be performed on a member of a queue set unless
a call to xQueueSelectFromSet() has first returned a handle to that set member.
The queue set on which the task will (potentially) block.
The maximum time, in ticks, that the calling task will
remain in the Blocked state (with other tasks executing) to wait for a member
of the queue set to be ready for a successful queue read or semaphore take
xQueueSelectFromSet() will return the handle of a queue (cast to
a QueueSetMemberHandle_t type) contained in the queue set that contains data,
or the handle of a semaphore (cast to a QueueSetMemberHandle_t type) contained
in the queue set that is available, or NULL if no such queue or semaphore
exists before before the specified block time expires.
See the example on the xQueueCreateSet() documentation page.
Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
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