:orphan:

.. title:: WAITQ_SCALABLE

.. option:: CONFIG_WAITQ_SCALABLE

*Use scalable wait_q implementation*

Type: ``bool``

Help
====

When selected, the wait_q will be implemented with a
balanced tree.  Choose this if you expect to have many
threads waiting on individual primitives.  There is a ~2kb
code size increase over WAITQ_DUMB (which may be shared with
SCHED_SCALABLE) if the rbtree is not used elsewhere in the
application, and pend/unpend operations on "small" queues
will be somewhat slower (though this is not generally a
performance path).

Direct dependencies
===================

\ :ref:`<choice WAITQ_ALGORITHM: Wait queue priority algorithm> <choice_141>`

*(Includes any dependencies from ifs and menus.)*

Kconfig definition
==================

.. highlight:: kconfig

At ``kernel/Kconfig:281``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:30``

Menu path: (Top) → General Kernel Options → Wait queue priority algorithm

.. parsed-literal::

    config WAITQ_SCALABLE
    	bool "Use scalable wait_q implementation"
    	depends on \ :ref:`<choice WAITQ_ALGORITHM: Wait queue priority algorithm> <choice_141>`
    	help
    	  When selected, the wait_q will be implemented with a
    	  balanced tree.  Choose this if you expect to have many
    	  threads waiting on individual primitives.  There is a ~2kb
    	  code size increase over WAITQ_DUMB (which may be shared with
    	  SCHED_SCALABLE) if the rbtree is not used elsewhere in the
    	  application, and pend/unpend operations on "small" queues
    	  will be somewhat slower (though this is not generally a
    	  performance path).

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*