kernel.h File Reference

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Classes
struct	tcb_entry
	Task control block (TCB) and processor control block (PCB) entry data structures. More...
struct	pcb_entry

Macros
#define	TASK_IDLE   0
#define	TASK_READY   1
#define	TASK_RUNNING   2
#define	TASK_BLOCKED   3
#define	TASK_DELAYED   4
#define	TASK_WAITING   5

Variables
struct tcb_entry	krnl_tcb [MAX_TASKS]
	The task control block and processor control block.
struct pcb_entry	krnl_pcb
struct tcb_entry *	krnl_task
uint16_t	krnl_tasks
uint16_t	krnl_current_task
uint16_t	krnl_schedule
struct queue *	krnl_run_queue
struct queue *	krnl_delay_queue
struct queue *	krnl_rt_queue
struct queue *	krnl_event_queue
uint8_t	krnl_heap [HEAP_SIZE]
uint32_t	krnl_free

Detailed Description

Author

Sergio Johann Filho

Date

February 2016

LICENSE

This source code is licensed under the GNU General Public License, Version 2. See the file 'doc/license/gpl-2.0.txt' for more details.

DESCRIPTION

Kernel data structures.

Macro Definition Documentation

TASK_BLOCKED

#define TASK_BLOCKED   3

task blocked, can be resumed later (on run queue)

TASK_DELAYED

#define TASK_DELAYED   4

task being delayed (on delay queue)

TASK_IDLE

#define TASK_IDLE   0

task does not exist / not ready

TASK_READY

#define TASK_READY   1

task ready to run (on run queue)

TASK_RUNNING

#define TASK_RUNNING   2

task running (only one task/core can be in this state, on run queue)

TASK_WAITING

#define TASK_WAITING   5

task waiting for an event (on event queue)

Variable Documentation

krnl_current_task

uint16_t krnl_current_task

the current running task id

krnl_delay_queue

struct queue* krnl_delay_queue

pointer to a queue of delayed tasks

krnl_event_queue

struct queue* krnl_event_queue

pointer to a queue of tasks waiting for an event

krnl_free

uint32_t krnl_free

amount of free heap memory, in bytes

krnl_heap

uint8_t krnl_heap[HEAP_SIZE]

contiguous heap memory area to be used as a memory pool. the memory allocator (malloc() and free()) controls this data structure

krnl_rt_queue

struct queue* krnl_rt_queue

pointer to a queue of real time tasks

krnl_run_queue

struct queue* krnl_run_queue

pointer to a queue of best effort tasks

krnl_schedule

uint16_t krnl_schedule

scheduler enable / disable flag

krnl_task

struct tcb_entry* krnl_task

pointer to a task control block entry

krnl_tasks

uint16_t krnl_tasks

number of tasks in the system