Real-time scheduler services.

Collaboration diagram for Real-time scheduler services.:

Files
file	sched.h
	Scheduler interface header.
file	sched-idle.c
	Idle scheduling class implementation (i.e. Linux placeholder).
file	sched-rt.c
	Common real-time scheduling class implementation (FIFO + RR)
file	sched-sporadic.c
	POSIX SCHED_SPORADIC scheduling class.
file	sched-tp.c
	Temporal partitioning (typical of IMA systems).
file	sched.c

Data Structures
struct	xnsched
	Scheduling information structure. More...

Macros
#define	XNKCOUT   0x80000000
#define	XNINTCK   0x40000000
#define	XNINSW   0x20000000
#define	XNRESCHED   0x10000000
#define	XNHTICK   0x00008000
#define	XNINIRQ   0x00004000
#define	XNHDEFER   0x00002000
#define	XNINLOCK   0x00001000
#define	XNRPICK   0x80000000

Typedefs
typedef struct xnsched	xnsched_t
	Scheduling information structure.

Functions
static void	xnsched_rotate (struct xnsched *sched, struct xnsched_class *sched_class, const union xnsched_policy_param *sched_param)
	Rotate a scheduler runqueue. More...

Detailed Description

Real-time pod services.

Macro Definition Documentation

#define XNHDEFER   0x00002000

Host tick deferred

Referenced by xntimer_tick_aperiodic().

#define XNHTICK   0x00008000

Host tick pending

Referenced by xntimer_tick_aperiodic().

#define XNINIRQ   0x00004000

In IRQ handling context

Referenced by xnpod_schedule().

#define XNINLOCK   0x00001000

Scheduler locked

Referenced by xnpod_delete_thread(), xnpod_schedule(), and xnpod_suspend_thread().

#define XNINSW   0x20000000

In context switch

Referenced by xnpod_delete_thread(), and xnpod_schedule().

#define XNINTCK   0x40000000

In master tick handler context

Referenced by xntimer_tick_aperiodic().

#define XNKCOUT   0x80000000

Sched callout context

Referenced by xnpod_schedule().

#define XNRESCHED   0x10000000

Needs rescheduling

Referenced by xnpod_schedule().

#define XNRPICK   0x80000000

Check RPI state

Function Documentation

void xnsched_rotate ( struct xnsched *  sched, struct xnsched_class *  sched_class, const union xnsched_policy_param *  param  )

inlinestatic

Rotate a scheduler runqueue.

The specified scheduling class is requested to rotate its runqueue for the given scheduler. Rotation is performed according to the scheduling parameter specified by sched_param.

Note

The nucleus supports round-robin scheduling for the members of the RT class.

Parameters

sched	The per-CPU scheduler hosting the target scheduling class.
sched_class	The scheduling class which should rotate its runqueue.
param	The scheduling parameter providing rotation information to the specified scheduling class.

Environments:

This service should be called from:

• Kernel-based task
• Interrupt service routine
• User-space task (primary mode only)

Rescheduling: never.