1ADDHOSTS(3PVM)                  PVM Version 3.4                 ADDHOSTS(3PVM)
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NAME

6       pvm_addhosts - Add hosts to the virtual machine.
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SYNOPSIS

9       C    int info = pvm_addhosts( char **hosts, int nhost, int *infos )
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11       Fortran   call pvmfaddhost( host, info )
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PARAMETERS

15       hosts   An  array  of  strings naming the hosts to be added.  Pvmd must
16               already be installed and the user must have an account  on  the
17               specified hosts.
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19       nhost   Integer specifying the length of array hosts.
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21       infos   Integer array of length nhost which returns the status for each
22               host.  Values less than zero indicate an error, while  positive
23               values are TIDs of the new hosts.
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25       host    Character string naming the host to be added.
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27       info    Integer  status code returned by the routine.  Values less than
28               nhost indicate partial failure, and values less than 1 indicate
29               total failure.
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DESCRIPTION

33       The  routine pvm_addhosts adds the computers named in hosts to the con‐
34       figuration of computers making  up  the  virtual  machine.   The  names
35       should  have  the same syntax as lines of a pvmd hostfile (see man page
36       for pvmd3): A hostname followed by options of the form xx=y.
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38       If pvm_addhosts is successful, info will be equal  to  nhost.   Partial
39       success  is  indicated by 0 < info < nhost, and total failure by info <
40       1.  The array infos can be checked to determine which host  caused  the
41       error.
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43       The Fortran routine pvmfaddhost adds a single host to the configuration
44       with each call.  info will be 1 if successful or < 0 if error.
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46       The status of hosts can be requested by the application using pvm_mstat
47       and  pvm_config.  If a host fails it will be automatically deleted from
48       the configuration.  Using pvm_addhosts a replacement host can be  added
49       by the application, however it is the responsibility of the application
50       developer to make his application tolerant of  host  failure.   Another
51       use  of  this  feature would be to add more hosts as they become avail‐
52       able, for example on a  weekend,  or  if  the  application  dynamically
53       determines it could use more computational power.
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EXAMPLES

57       C:
58            static char *hosts[] = {
59                "sparky",
60                "thud.cs.utk.edu",
61            };
62            info = pvm_addhosts( hosts, 2, infos );
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64       Fortran:
65            CALL PVMFADDHOST( 'azure', INFO )
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ERRORS

69       The following error conditions can be returned by pvm_addhosts:
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71       PvmBadParam
72              giving an invalid argument value.
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74       PvmAlready
75              another task is currently adding hosts.
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77       PvmSysErr
78              local pvmd is not responding.
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80       and in the infos vector:
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82       PvmBadParam
83              bad hostname syntax.
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85       PvmNoHost
86              no such host.
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88       PvmCantStart
89              failed to start pvmd on host.
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91       PvmDupHost
92              host already configured.
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94       PvmBadVersion
95              pvmd protocol versions don't match.
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97       PvmOutOfRes
98              PVM has run out of system resources.
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SEE ALSO

101       pvm_pvmd3(1PVM),   pvm_delhosts(3PVM),  pvm_start_pvmd(3PVM),  pvm_con‐
102       fig(3PVM), pvm_mstat(3PVM)
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106                               22 February, 1994                ADDHOSTS(3PVM)
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