【已解决】鲲鹏CPU移植GRPC库，builder.BuildAndStart()接口阻塞问题

GRPC版本：

v1.30.0  c++

uname -a:

Linux localhost.localdomain 4.14.0-115.el7a.0.1.aarch64 #1 SMP Sun Nov 25 20:54:21 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux

操作系统：

CentOS Linux release 7.6.1810 (AltArch)

问题描述：

int RunServer(std::string stdAddr)
{
    std::string server_address(stdAddr);
    grpcServiceImpl service;
    ServerBuilder builder;
    
    builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
    builder.RegisterService(&service);
    /*
    std::unique_ptr<Server> server(builder.BuildAndStart());语句阻塞
    且此时CPU占有率为100
    */
    std::unique_ptr<Server> server(builder.BuildAndStart());
    LOG(INFO) << "GRPC RunServer";
    server->Wait();
    return 0;
}

解决方案：

修改grpc源码：grpc\src\core\lib\debug\trace.cc 中的void TraceFlagList::Add(TraceFlag* flag)函数。

void TraceFlagList::Add(TraceFlag* flag) {
  for (TraceFlag* t = root_tracer_; t != nullptr; t = t->next_tracer_) {
    if (t == flag) {
      return;
    }
  }	
  flag->next_tracer_ = root_tracer_;
  root_tracer_ = flag;
}

修改完后，重新编译grpc库即可。