[Mpi3-tools] proccess ID type?

[William Gropp]

They should be the same type, but they shouldn't be a type that is  
specific to one particular choice of operating system.  pid_t isn't a  
universal type.  int64_t might be sufficient to contain any simple  
enumeration of processes; otherwise, we'll need to define a type and  
the accessors for it.

Bill

On Mar 16, 2009, at 3:03 PM, Geoffrey R. Paulsen wrote:

> Hello,  I noticed a difference in the type used to declare pids in  
> two different areas, and I'm curious:
>
>  1) Why aren't they the same type?
>  2) Why aren't we using a standardzed type like pid_t ?
>
> Location 1) http://www.mcs.anl.gov/research/projects/mpi/mpi-debug/
>
>        Taken from: mpich/mpid/ch2/attach.h
>
>        typedef struct {
>          char * host_name;           /* Something we can pass to  
> inet_addr */
>          char * executable_name;     /* The name of the image */
>          int    pid;		      /* The pid of the process */
>        } MPIR_PROCDESC;
>
>
> Location 2) http://www.mcs.anl.gov/research/projects/mpi/mpi-debug/mpi_interface.h.html
>
>        Taken from: mpich/src/infoexport/mpi_interface.h
>
>        #if (FOR_MPI2)
>        /* For handling attachment to new processes in MPI-2 we need  
> to know
>         * where they are.
>         */
>        typedef struct mqs_process_location {
>          long pid;
>          char image_name [FILENAME_MAX];
>          char host_name  [64];
>        } mqs_process_location;
>        #endif
>
>
> These two structures look to have similar purposes.  Is one a  
> "newer" version of the other?  Are they from different MPI  
> implementations of the MSQ?
>
>
>  Thanks,
>  Geoff Paulsen
>
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William Gropp
Deputy Director for Research
Institute for Advanced Computing Applications and Technologies
Paul and Cynthia Saylor Professor of Computer Science
University of Illinois Urbana-Champaign