I tried to do : pthread_cancel(thread2). This terminates the blocking accept. However, MPI_Finalize hangs. Regards, Hirak From: Roy, Hirak Sent: Wednesday, October 08, 2014 9:28 AM To: [email protected] Subject: Re: How to terminate MPI_Comm_accept Hi Huiwei, Thanks for your response. I don't think the solution you suggested will work. MPI_Comm_accept is a blocking MPI call and the call does not return until there is a matching MPI_Comm_connect or implementation specified timeout ( the timeout can not be configured and reasonably high). So when Thread2 is waiting on MPI_Comm_accept, it neither can receive any message nor can check any shared flag value. That's why I tried to terminate the accept by connecting from thread1. Please let me know if you have any other suggestion. Thanks, Hirak _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss