系统库 signal.go 中有这么一段代码：
// Wait until there are no more signals waiting to be delivered.
// Defined by the runtime package.
func signalWaitUntilIdle() //<-------------这里看不懂啊，我自己尝试模仿一个，报错说函数必须有函数体
func process(sig os.Signal) {
n := signum(sig)
if n < 0 {
return
}
handlers.Lock()
defer handlers.Unlock()
for c, h := range handlers.m {
if h.want(n) {
// send but do not block for it
select {
case c <- sig:
default:
}
}
}
// Avoid the race mentioned in Stop.
for _, d := range handlers.stopping {
if d.h.want(n) {
select {
case d.c <- sig:
default:
}
}
}
}
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