Create a PeriodicThreadDescriptor for each thread to be run as a group.
为每个要运行的组线程创建PeriodicThreadDescriptor。
Alternatively, the kernel may force a whole thread group to die.
另外，内核可能强迫整个线程组结束。
创建一个新线程组。
In addition, a thread group can also include other thread groups.
另外，一个线程组可以包含其他线程组。
The thread package source code, as well as the thread group of packages.
线程的封装源代码，以及线程组的封装。
Returns the parent of this thread group.
返回该线程组的父线程组。
Returns the parent of this thread group.
返回该线程组的父线程组。
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