RTEMS Ada User's Guide
Returns a pointer a node. If a node was removed, then a pointer to that node is returned. If the chain was empty, then NULL is returned.
This function removes the first node from the chain and returns a pointer to that node. If the chain is empty, then NULL is returned.
Interrupts are disabled while obtaining the node to ensure the atomicity of the operation.
Use rtems.chain_get_unprotected() to avoid disabling of
interrupts.
RTEMS Ada User's Guide
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