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。
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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