Delivering interrupts to user-level applications

A method, comprising:

• determining, by a processing core without a privilege level transition, that an identifier of a pending interrupt matches a notification interrupt vector associated with an application being executed by the processing core;
• setting, in an interrupt control data structure associated with the application, a pending interrupt flag corresponding to an identifier of the interrupt;
• selecting a highest priority pending interrupt among pending interrupts identified by the interrupt control data structure;
• and
• invoking an interrupt handler for the highest priority pending interrupt identified by the interrupt control data structure.

A computer-readable non-transitory storage medium comprising executable instructions that, when executed by a processing system, cause the processing system to:

• determine, without a privilege level transition, that an identifier of a pending interrupt matches a notification interrupt vector associated with an application being executed by the processing system;
• set, in an interrupt control data structure associated with the application, a pending interrupt flag corresponding to an identifier of the interrupt;
• selecting a highest priority pending interrupt among pending interrupts identified by the interrupt control data structure;
• and
• invoke an interrupt handler for the highest priority pending interrupt identified by the interrupt control data structure.