The node begins timings as soon as the containing message flow has been deployed, and the first timer event occurs as soon as the flow is deployed.
一旦包含的消息流被部署，该节点将立即开始计时，第一个计时器事件将立即发生。
The process begins with the initialization of a timer through hrtimer_init.
定义过程首先通过 hrtimer_init初始化一个计时器。
When overridden in a derived class, begins a timer with the specified name.
在衍生类别中覆写时，让指定名称的计时器开始计时。
When overridden in a derived class, begins a timer with the specified name.
在衍生类别中覆写时，让指定名称的计时器开始计时。
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