Question

我使用带有超时的readdata=0; port_->async_read_some(boost::asio::buffer(vector), boost::bind(readCallback)); //init async timer boost::asio::deadline_timer timer(io); timer.async_wait(boost::bind(timeoutHandler)); timer.expires_from_now(boost::posix_time::seconds(5)); io.reset(); do { io.run_one(); } while (readdata==0);代码

void readCallback()
{
    std::cout << "READ CALLBACK: "<<x<<std::endl;
    readdata=1;
    return;
}
void timeoutHandler()
{
   std::cout << "TIMEOUT CALLBACK: "<<x<<std::endl;
   readdata=1;
}

这是我的回调

System.IO.File.ReadAllText("D:\home\site\wwwroot\Prod-Enterprise-Test-6-26-2016-credentials.publishsettings")

我的问题是timeoutHandler是立即执行的，而不是在5秒后执行

Answer 1

简单的错误。在致电expires_from_now之前，您应该async_wait。

#include <iostream>
#include <asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>

int main() {
  asio::io_service io_s;
  asio::deadline_timer timer(io_s);
  timer.expires_from_now(boost::posix_time::seconds(5));
  timer.async_wait([](auto err_c) { std::cout << "After 5 seconds" << std::endl; } );

  io_s.reset();

  io_s.run();

  return 0;
}

提升asio async_read_some超时

1 个答案: