MPI_Irecv和MPI_Isend操作返回一个MPI_Request，以后可以使用MPI_Cancel将其标记为已取消。是否有类似的机制来阻止MPI_Probe和MPI_Mprobe？

问题的上下文是Boost.MPI request handlers使用Probe的最新实现。

编辑-这是一个如何使用假设的MPI_Probecancel的示例：

#include <mpi.h>

#include <chrono>
#include <future>

using namespace std::literals::chrono_literals;

// Executed in a thread
void async_cancel(MPI_Probe *probe)
{
  std::this_thread::sleep_for(1s);

  int res = MPI_Probecancel(probe);
}

int main(int argc,char* argv[])
{
  int provided;
  MPI_Init_thread(&argc,&argv,MPI_THREAD_MULTIPLE,&provided);

  if (rank == 0)
  {
    // A handle to the probe (similar to a request)
    MPI_Probe probe;

    // Start a thread
    // `probe` will be filled with the next call,pretty ugly
    // Ideally,this should be done in two steps like MPI_Irecv,MPI_Wait
    auto res = std::async(std::launch::async,&async_cancel,&probe);

    MPI_Message message;
    MPI_Status status;
    MPI_MProbe(1,123,MPI_COMM_WORLD,&message,&status,&probe);

    if (!probe.cancelled)
    {
        int buffer;
        MPI_Mrecv(&buffer,1,MPI_INT,&status);
    }
  }
  else
    std::this_thread::sleep_for(2s);

  MPI_Finalize();
  return 0;
}