CONFIG_NUM_COOP_PRIORITIES:

Number of cooperative priorities configured in the system. Gives access to priorities:

K_PRIO_COOP(0) to K_PRIO_COOP(CONFIG_NUM_COOP_PRIORITIES - 1)

or seen another way, priorities:

-CONFIG_NUM_COOP_PRIORITIES to -1

This can be set to zero to disable cooperative scheduling. Cooperative threads always preempt preemptible threads.

Each priority requires an extra 8 bytes of RAM. Each set of 32 extra total priorities require an extra 4 bytes and add one possible iteration to loops that search for the next thread to run.

The total number of priorities is

NUM_COOP_PRIORITIES + NUM_PREEMPT_PRIORITIES + 1

The extra one is for the idle thread, which must run at the lowest priority, and be the only thread at that priority.

Symbol:

NUM_COOP_PRIORITIES

Type:

int

Value:

“16”

User value:

(no user value)

Visibility:

“y”

Is choice item:

false

Is defined:

true

Is from env.:

false

Is special:

false

Ranges:

• [0, 128]

Prompts:

• “Number of coop priorities” if MULTITHREADING (value: “y”)

Default values:

• 16 (value: “n”)
• Condition: (none)
• 1 (value: “n”)
• Condition: !MULTITHREADING (value: “n”)

Selects:

(no selects)

Reverse (select-related) dependencies:  

(no reverse dependencies)

Additional dependencies from enclosing menus and ifs:  

(no additional dependencies)

Locations:

• ../kernel/Kconfig:32