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ADDHOSTS(3PVM)			 PVM Version 3.4		  ADDHOSTS(3PVM)

NAME
     pvm_addhosts - Add hosts to the virtual machine.

SYNOPSIS
     C	  int info = pvm_addhosts( char **hosts, int nhost, int *infos )

     Fortran   call pvmfaddhost( host, info )

PARAMETERS
     hosts   An  array	of  strings naming the hosts to be added.  Pvmd must al-
	     ready be installed and the user must have an account on the  speci-
	     fied hosts.

     nhost   Integer specifying the length of array hosts.

     infos   Integer  array  of  length  nhost which returns the status for each
	     host.  Values less than zero indicate an error, while positive val-
	     ues are TIDs of the new hosts.

     host    Character string naming the host to be added.

     info    Integer status code returned by  the  routine.   Values  less  than
	     nhost indicate partial failure, and values less than 1 indicate to-
	     tal failure.

DESCRIPTION
     The  routine pvm_addhosts adds the computers named in hosts to the configu-
     ration of computers making up the virtual machine.  The names  should  have
     the  same	syntax	as  lines of a pvmd hostfile (see man page for pvmd3): A
     hostname followed by options of the form xx=y.

     If pvm_addhosts is successful, info will be equal to nhost.   Partial  suc-
     cess  is indicated by 0 < info < nhost, and total failure by info < 1.  The
     array infos can be checked to determine which host caused the error.

     The Fortran routine pvmfaddhost adds a single  host  to  the  configuration
     with each call.  info will be 1 if successful or < 0 if error.

     The status of hosts can be requested by the application using pvm_mstat and
     pvm_config.  If a host fails it will be automatically deleted from the con-
     figuration.   Using pvm_addhosts a replacement host can be added by the ap-
     plication, however it is the responsibility of the application developer to
     make his application tolerant of host failure.  Another use of this feature
     would be to add more hosts as they become available, for example on a week-
     end, or if the application dynamically determines it could use more  compu-
     tational power.

EXAMPLES
     C:
	  static char *hosts[] = {
	      "sparky",
	      "thud.cs.utk.edu",
	  };
	  info = pvm_addhosts( hosts, 2, infos );

     Fortran:
	  CALL PVMFADDHOST( 'azure', INFO )

ERRORS
     The following error conditions can be returned by pvm_addhosts:

     PvmBadParam
	    giving an invalid argument value.

     PvmAlready
	    another task is currently adding hosts.

     PvmSysErr
	    local pvmd is not responding.

     and in the infos vector:

     PvmBadParam
	    bad hostname syntax.

     PvmNoHost
	    no such host.

     PvmCantStart
	    failed to start pvmd on host.

     PvmDupHost
	    host already configured.

     PvmBadVersion
	    pvmd protocol versions don't match.

     PvmOutOfRes
	    PVM has run out of system resources.

SEE ALSO
     pvm_pvmd3(1PVM),	 pvm_delhosts(3PVM),	pvm_start_pvmd(3PVM),	pvm_con-
     fig(3PVM), pvm_mstat(3PVM)

				22 February, 1994		  ADDHOSTS(3PVM)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=pvm_addhosts&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

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