CONFIG(3PVM)							  PVM Version 3.4						      CONFIG(3PVM)

NAME

       pvm_config - Returns information about the present virtual machine configuration.

SYNOPSIS

       C    int info = pvm_config( int *nhost, int *narch, struct pvmhostinfo **hostp )
	    struct pvmhostinfo {
		 int  hi_tid;
		 char *hi_name;
		 char *hi_arch;
		 int  hi_speed;
	    };

       Fortran	 call pvmfconfig( nhost, narch, dtid, name, arch, speed, info )

PARAMETERS

       nhost   Integer returning the number of hosts (pvmds) in the virtual machine.

       narch   Integer returning the number of different data formats being used.

       hostp   Returns pointer to an array of structures which contain information about each host including its pvmd task ID, name, architecture,
	       and relative speed.

       dtid    Integer returning pvmd task ID for host

       name    Character string returning name of host

       arch    Character string returning architecture name of host

       speed   Integer returning relative speed of host. Default value is 1000.

       info    Integer status code returned by the routine.  Values less than zero indicate an error.

DESCRIPTION

       The routine pvm_config returns information about the present virtual machine. The information returned is similar to  that  available  from
       the console command conf.

       The  C  function  returns information about the entire virtual machine in one call. The Fortran function returns information about one host
       per call and cycles through all the hosts.  Thus, if pvmfconfig is called nhost times, the entire virtual machine will be represented.

       Note that in C the hostp array is allocated and owned by libpvm.  It is automatically freed or reused on the next call to pvm_config.

       Note that in Fortran the reported value of nhost and the  host configuration do not change until the function resets at the end of  a  com-
       plete cycle.  The user can reset pvmfconfig() at any time by calling it with nhost = -1.

       If pvm_config is successful, info will be 0.  If some error occurs then info will be < 0.

EXAMPLES

       C:
	    struct pvmhostinfo *hostp;
	    int i, nhost, narch;

	    info = pvm_config( &nhost, &narch, &hostp );
	    for (i = 0; i < nhost; i++)
		 printf("%s
", hostp[i].hi_name);

       Fortran:
	    Do i=1, NHOST
	      CALL PVMFCONFIG( NHOST,NARCH,DTID(i),HOST(i),ARCH(i),SPEED(i),INFO )
	    Enddo

ERRORS

       The following error condition can be returned by pvm_config

       PvmSysErr
	      pvmd not responding.

SEE ALSO

       pvm_tasks(3PVM)

								  31 August, 1994						      CONFIG(3PVM)