zombie processes are simply child processes that have exited, yet the
parent has not caught the SIGCHLD and done a "wait()" to get the process
termination status.
The question is, now, why didn't the parent catch the SIGCHLD and then
clear up things by doing a waitpid()??
Robert Hyatt Computer and Information Sciences
[EMAIL PROTECTED] University of Alabama at Birmingham
(205) 934-2213 115A Campbell Hall, UAB Station
(205) 934-5473 FAX Birmingham, AL 35294-1170
On Wed, 9 Aug 2000, Wang Yong wrote:
> Hi there,
> Recently I make a program running with both the support of Mpi and Pthread. The
>program is run on a Linux SMP kernel. If "mpirun -np 1 pi", the program can run well
>and with the correct result, but if "mpirun -np 2 pi", some threads that were created
>by the program in a mpi process(task) must got to be in "Zombie". What's the problem?
> As follows is the main frame of the program:
>
> ****************************
> pi(void *arg) {
> ...//computing PI
> }
> main()
> {
> MPI_Init();
> pthread_create(th1, pi, NULL, 0);
> pthread_create(th2, pi ,NULL, 1);
> ...
> pthread_join(th1...);
> pthread_join(th2...);
> MPI_Reduce(...);
> }
>
> Many thanks!
> wyong
>
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>
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