Karssadin commented on issue #2971:
URL: https://github.com/apache/brpc/issues/2971#issuecomment-2903038605
我看到代码中
```
cntl->IssueRPC(start_send_real_us);
if (done == NULL) {
// MUST wait for response when sending synchronous RPC. It will
// be woken up by callback when RPC finishes (succeeds or still
// fails after retry)
Join(correlation_id);
if (cntl->_span) {
cntl->SubmitSpan();
}
cntl->OnRPCEnd(butil::gettimeofday_us());
}
```
利用channel去发送请求后如果没有给到done做回调函数的话，会在当前线程阻塞。
IssueRPC中会判断有没有启用`write_in_background`，如果启用了这个flag，并且有closure做done当做回调函数，是会使用共享线程去发送吗？
如果是的话，在Client发出请求时这个共享线程超过限制的话，client端会收到什么错误码？
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