Interface to the POSIX Priority Implementation. More...

Files
file	psxpriorityisvalid.c
	POSIX Is Priority Valid.

Macros
#define	POSIX_SCHEDULER_MINIMUM_PRIORITY (1)

Functions
Priority_Control	_POSIX_Priority_To_core (const Scheduler_Control scheduler, int priority, bool valid)
	Converts the POSIX API priority to the corresponding SuperCore priority and validates it.

int	_POSIX_Priority_From_core (const Scheduler_Control *scheduler, Priority_Control priority)
	Converts the SuperCore priority to the corresponding POSIX API priority.

Detailed Description

Interface to the POSIX Priority Implementation.

Macro Definition Documentation

◆ POSIX_SCHEDULER_MINIMUM_PRIORITY

#define POSIX_SCHEDULER_MINIMUM_PRIORITY (1)

This is the numerically least important POSIX priority.

Function Documentation

◆ _POSIX_Priority_From_core()

int _POSIX_Priority_From_core	(	const Scheduler_Control *	scheduler,
		Priority_Control	priority
	)

Converts the SuperCore priority to the corresponding POSIX API priority.

Parameters

[in]	scheduler	The scheduler instance.
[in]	priority	The SuperCore priority to convert.

Returns: The corresponding POSIX API priority.

◆ _POSIX_Priority_To_core()

Priority_Control _POSIX_Priority_To_core	(	const Scheduler_Control *	scheduler,
		int	priority,
		bool *	valid
	)

Converts the POSIX API priority to the corresponding SuperCore priority and validates it.

According to POSIX, numerically higher values represent higher priorities. Thus, SuperCore has priorities run in the opposite sense of the POSIX API.

Let N be the maximum priority of this scheduler instance. The SuperCore priority zero is system reserved (PRIORITY_MINIMUM). There are only N - 1 POSIX API priority levels since a thread at SuperCore priority N would never run because of the idle threads. This is necessary because GNAT maps the lowest Ada task priority to the lowest thread priority. The lowest priority Ada task should get to run, so there is a fundamental conflict with having N priorities.