:orphan:

.. title:: CONFIG_WAITQ_SCALABLE

.. kconfig:: CONFIG_WAITQ_SCALABLE

CONFIG_WAITQ_SCALABLE
#####################

*Use scalable wait\_q implementation*

Type: ``bool``

Help
====

.. code-block:: none

    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_277>`

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

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



At ``<Zephyr Kernel>/Kconfig:270``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:40``

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

.. code-block:: kconfig

    config WAITQ_SCALABLE
    	bool "Use scalable wait_q implementation"
    	depends on <choice WAITQ_ALGORITHM>
    	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.)*