user_irq_claim_unused() function

Claim ownership of a free user IRQ on the calling core User IRQs starting from FIRST_USER_IRQ are not connected to any hardware, but can be triggered by irq_set_pending. This method explicitly claims ownership of an unused user IRQ if there is one, so other code can know it is being used.

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Summary

Declaration

Definition

from irq.h:452

int user_irq_claim_unused(bool required);

Implemented in irq.c:683

Arguments

Argument

Description

required

if true the function will panic if none are available

Return value

the user IRQ number or -1 if required was false, and none were free

Notes

User IRQs are a core local feature; they cannot be used to communicate between cores. Therefore all functions dealing with Uer IRQs affect only the calling core

Examples

References

from examples

user_irq_claim_unused() function

Syntax

Arguments

Return value

Notes

Examples

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