一、进程
1.1 进程声明和定义[1]
PROCESS_THREAD(name, ev, data)-----Define the body of a process.
PROCESS_NAME(name)-----Declare the name of a process.
PROCESS(name, strname)-----Declare a process.
1.2 process protothread方法
PROCESS_BEGIN()-----Define the beginning of a process.
PROCESS_END()-----Define the end of a process.
PROCESS_EXIT()-----Exit the currently running process.
PROCESS_CURRENT()-----Get a pointer to the currently running process. PROCESS_CONTEXT_BEGIN(p)-----Switch context to another process. PROCESS_CONTEXT_END(p)-----End a context switch.
PROCESS_POLLHANDLER(handler)-----Specify an action when a process is polled. PROCESS_EXITHANDLER(handler)-----Specify an action when a process exits.
1.3 进程内核函数[2]
void process_start (struct process *p, const char *arg)-----Start a process.
void process_exit (struct process *p)-----Cause a process to exit.
1.4 挂起进程相关[1][3]
PROCESS_WAIT_EVENT()-----Wait for an event to be posted to the process. PROCESS_WAIT_EVENT_UNTIL(c)-----Wait for an event to be posted to the process, with an extra condition.
PROCESS_YIELD()-----Yield the currently running process.
PROCESS_YIELD_UNTIL(c)-----Yield the currently running process until a condition occurs.
PROCESS_WAIT_UNTIL(c)-----Wait for a condition to occur.
PROCESS_WAIT_WHILE(c)-----PT_WAIT_WHILE(process_pt, c)
PROCESS_PT_SPAWN(pt, thread)-----Spawn a protothread from the process.
PROCESS_PAUSE()-----Yield the process for a short while.
二、事件
2.1 新建事件[1]
process_event_t process_alloc_event (void)-----Allocate a global event number.
2.2 传递事件[1][2]
int process_post (struct process *p, process_event_t ev, void *data)-----Post an asynchronous event.
void process_post_synch (struct process *p, process_event_t ev, void *data)-----Post a synchronous event to a process.
三、etimer[4][5]
void etimer_set (struct etimer *et, clock_time_t interval)-----Set an event timer.
void etimer_reset (struct etimer *et)-----Reset an event timer with the same interval as was previously set.
void etimer_restart (struct etimer *et)-----Restart an event timer from the current point in time.
这里特别对etimer_reset 和 etimer_restart进行说明，容易混淆。
either_reset ：定时事件已经到了，我现在需要重新计时，此时，我重置下et->start=et->start+et-.interval, 也就是刚计时结束的那个点为起点，继续计时。这个函数周期性很好，是精确的一次一个et->interval 向前迈进的。
etimer_restart ：从现在的时间点重新计时et->interval 时间，虽然时间起点有漂移，但是它也是准确的监测et->interval时间段。产生时间事件。这个不需要很好的周期性，当需要et->interval这么长时间时，调用就行了。
void etimer_adjust (struct etimer *et, int td)-----Adjust the expiration time for an event timer.
void etimer_stop (struct etimer *et)-----Stop a pending event timer.
int etimer_expired (struct etimer *et)-----Check if an event timer has expired.
clock_time_t etimer_expiration_time (struct etimer *et)-----Get the expiration time for the event timer.
clock_time_t etimer_start_time (struct etimer *et)-----Get the start time for the event timer.
参考资料：
[1]
[2]
[3] 博文《Contiki学习笔记：编程模式》
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