1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
#ifndef TASK_H
#define TASK_H
#include "collection/list.h"
/**
* Wakeup sources define the minimum power level
* at which a task that is waiting in a queue
* can be woken up
*/
enum wakeup_src {
WAKEUP_SRC_OFF = 0, //processor off, external interrupts may trigger this source
WAKEUP_SRC_CLOCK = 1, //main clock required
WAKEUP_SRC_IDLE = 2, //processor can be put in idle state
WAKEUP_SRC_ON = 3 //processor must stay on
};
/**
* Task control block, contains runtime
* information about tasks.
*/
struct tcb_t {
/** Stack pointer of this task. (must be first in structure) */
char* volatile sp;
/** Lowest address of this task's memory (inclusive). */
char* mem_low;
/** Highest address of this task's memory (inclusive). */
char* mem_high;
/** Entry function of this task. */
void (*entry)(char);
/** Current wait queue that this task is in.*/
struct list_head queue;
/** ID of task. */
char id;
enum wakeup_src wakeup_src;
};
/**
* Utility for declaring a task with statically allocated memory.
* Note: for a task to be scheduled, it must first be spawned (see spawn()).
*/
#define DECLARE_TASK(name, stack_size, entry_function, pid) \
static char _declared_stack_##name[stack_size]; \
static struct tcb_t name = { \
.sp = 0, \
.mem_low = _declared_stack_##name, \
.mem_high = _declared_stack_##name + stack_size - 1, \
.entry = entry_function, \
.queue = {}, \
.id = pid, \
.wakeup_src = WAKEUP_SRC_ON \
};
#endif
|
