For example,
the some thread maked by PT in parent process marked by PP invoked syscall
fork(), cfork() is invoked in the kernel state which create child process
marked by CP, CP's proc struct(as,p_exec,p_user,klwp_t/kthread pairs) is
duplicated by PP's proc. Besides the kernel stack of CP's kthread is equal to
the kernel statck of PT,so CP's current thread is dispatched by cpu to execute
the code after fork() in PT thread code.
Question:CP has no any user thread(ulwp_t), why not duplicate ulwp_t?
Is PT's ulwp_t shared by PP and CP? if so, it is not conform
ulwp_t:klwp_t:kthread_t=1:1:1?!
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