参考网址:

什么是状态机？用C语言实现进程5状态模型_一口Linux的专栏-CSDN博客

例程

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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
// stateMachine.c
#include <unistd.h>
#include <stdio.h>
#include <pthread.h>

typedef enum {
  sta_origin=0,
  sta_running,
  sta_owencpu,
  sta_sleep_int,
  sta_sleep_unint
}State;

static const  char *statename[]={
	"origin",
	"running",
	"owencpu",
	"sleep_int",
	"sleep_unint",	
};

typedef enum{
  evt_fork=0,
  evt_sched,
  evt_wait,
  evt_wait_unint,
  evt_wake_up,
  evt_wake, 
}EventID;

typedef  void (*CallBack)(void *) ;

typedef struct {
  State curState;//当前状态
  EventID eventId;//事件ID
  State nextState;//下个状态
  CallBack action;//回调函数
}StateTransform ; 



State globalState = sta_origin;
pthread_t pid;


void action_callback(void *arg)
{
	StateTransform *statTran = (StateTransform *)arg;
	
	if(statename[statTran->curState] == statename[statTran->nextState])
	{
		printf("invalid event,state not change\n");
	}else{
		printf("call back state from %s --> %s\n",
			statename[statTran->curState],
			statename[statTran->nextState]);
	}
}
	
/*origin*/
StateTransform stateTran_0[]={
	{sta_origin,evt_fork,         sta_running,action_callback},
	{sta_origin,evt_sched,      sta_origin,NULL},
	{sta_origin,evt_wait,        sta_origin,NULL},
	{sta_origin,evt_wait_unint,sta_origin,NULL},
	{sta_origin,evt_wake_up,   sta_origin,NULL},
	{sta_origin,evt_wake,        sta_origin,NULL},
}; 

/*running*/
StateTransform stateTran_1[]={
	{sta_running,evt_fork,         sta_running,NULL},
	{sta_running,evt_sched,      sta_owencpu,action_callback},
	{sta_running,evt_wait,        sta_running,NULL},
	{sta_running,evt_wait_unint,sta_running,NULL},
	{sta_running,evt_wake_up,   sta_running,NULL},
	{sta_running,evt_wake,        sta_running,NULL},
}; 
/*owencpu*/
StateTransform stateTran_2[]={
	{sta_owencpu,evt_fork,         sta_owencpu,NULL},
	{sta_owencpu,evt_sched,      sta_owencpu,NULL},
	{sta_owencpu,evt_wait,        sta_sleep_int,action_callback},
	{sta_owencpu,evt_wait_unint,sta_sleep_unint,action_callback},
	{sta_owencpu,evt_wake_up,   sta_owencpu,NULL},
	{sta_owencpu,evt_wake,        sta_owencpu,NULL},
}; 

/*sleep_int*/
StateTransform stateTran_3[]={
	{sta_sleep_int,evt_fork,         sta_sleep_int,NULL},
	{sta_sleep_int,evt_sched,      sta_sleep_int,NULL},
	{sta_sleep_int,evt_wait,        sta_sleep_int,NULL},
	{sta_sleep_int,evt_wait_unint,sta_sleep_int,NULL},
	{sta_sleep_int,evt_wake_up,   sta_sleep_int,NULL},
	{sta_sleep_int,evt_wake,        sta_running,action_callback},
}; 
/*sleep_unint*/
StateTransform stateTran_4[]={
	{sta_sleep_unint,evt_fork,         sta_sleep_unint,NULL},
	{sta_sleep_unint,evt_sched,      sta_sleep_unint,NULL},
	{sta_sleep_unint,evt_wait,        sta_sleep_unint,NULL},
	{sta_sleep_unint,evt_wait_unint,sta_sleep_unint,NULL},
	{sta_sleep_unint,evt_wake_up,   sta_running,action_callback},
	{sta_sleep_unint,evt_wake,        sta_sleep_unint,NULL},
}; 

void init_machine(void)
{
	globalState = sta_origin;
}
/*显示当前状态*/
void *show_stat(void *arg)
{
	int len;
	char buf[64]={0};
	
	while(1)
	{
		sleep(1);
		printf("cur stat:%s\n",statename[globalState]);
	}	
}

#define STATETRANS(n)  (stateTran_##n)

/*change state & call callback()*/
void do_action(StateTransform *statTran)
{
	if(NULL == statTran)
	{
		perror("statTran is NULL\n");
		return;
	}
	globalState = statTran->nextState;
	if(statTran->action != NULL)
	{
		statTran->action((void*)statTran);
	}else{
		printf("invalid event,state not change\n");
	}
}
void event_happen(unsigned int event)
{
	switch(globalState)
	{
		case sta_origin:
			do_action(&STATETRANS(0)[event]);

			break;
		case sta_running:
			do_action(&STATETRANS(1)[event]);
			break;
		case sta_owencpu:
			do_action(&STATETRANS(2)[event]);
			
			break;
		case sta_sleep_int:
			do_action(&STATETRANS(3)[event]);
			
			break;
		case sta_sleep_unint:
			do_action(&STATETRANS(4)[event]);
			
			break;
		default:
			printf("state is invalid\n");
			break;
	}
	
}

void main(void)
{
	init_machine();

	pthread_create(&pid, NULL,show_stat, NULL);

	sleep(5);
	event_happen(evt_fork);

	sleep(5);
	event_happen(evt_sched);
	sleep(5);
	event_happen(evt_sched);
	sleep(5);
	event_happen(evt_wait);
	sleep(5);
	event_happen(evt_wake);
	
}
1
gcc -o main stateMachine.c -pthread -g