rpbear88 opened a new issue #1443:
URL: https://github.com/apache/incubator-brpc/issues/1443
hi all，在`TaskGroup::sched_to`的代码中有这么一句注释：
```
if (next_meta->stack != cur_meta->stack) {
jump_stack(cur_meta->stack, next_meta->stack);
// probably went to another group, need to assign g again.
g = tls_task_group;
}
```
我比较好奇产生这个的原因，按我理解是不是因为某个bthread的栈可能是分配在另一个pthread中(使用其main stack)的，但是由于work
stealing，该task被本worker得到，那么jump stack会回到最初的pthread worker中？所以以下两种情况下，work
stealing作用不大：
1. 用户选择的栈模式是BTHREAD_STACKTYPE_PTHREAD
2. 分配栈空间时OOM了
但是还是感觉不太对的是，如果只是切个用户态的栈，好像也不会切换pthread吧？到底是什么原因还请解释下。
@jamesge @chenzhangyi
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