pvm_tasks(3)
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NAME

pvm_tasks - Returns information about the tasks running on the virtual machine.

SYNOPSIS

C int info = pvm_tasks( int where, int *ntask, struct pvmtaskinfo **taskp )

struct pvmtaskinfo {
int ti_tid; int ti_ptid;
int ti_host;
int ti_flag; char *ti_a_out; } taskp;

Fortran call pvmftasks( where, ntask, tid, ptid, dtid, flag, aout, info )

PARAMETERS

where Integer specifying what tasks to return information about. The options are:

0
for all the tasks on the virtual machine
pvmd tid
for all tasks on a given host
tid
for a specific task

ntask Integer returning the number of tasks being reported on.

taskp Returns pointer to an array of structures which contain information about each task including its task ID, parent tid, pvmd task ID, status flag, and the name of this task's executable file. The status flag values are: waiting for a message, waiting for the pvmd, and running.

tid Integer returning task ID of one task

ptid Integer returning parent task ID

dtid Integer returning pvmd task ID of host task is on.

flag Integer returning status of task

aout Character string returning the name of spawned task. Manually started tasks return blank.

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

the virtual machine. The information returned is the same as that available from the console command ps. The C function returns information about the entire virtual machine in one call. The Fortran function returns information about one task per call and cycles through all the tasks. Thus, if where = 0, and pvmftasks is called ntask times, all tasks will be represented. If pvm_tasks is successful, info will be 0. If some error occurs then info will be < 0.

EXAMPLES

C:
    struct pvmtaskinfo *taskp;
    int i, ntask;

       info = pvm_tasks( 0, &ntask, &taskp );
       for (i = 0; i < ntask; i++)
                 printf("t%x\n", taskp[i].ti_tid);
Fortran:
Do i=1, NTASK
CALL PVMFTASKS( DTID, NTASK, TID(i), PTID(i), DTID(i),
& FLAG(i), AOUT(i), INFO )
EndDo

ERRORS

The following error condition can be returned by pvm_tasks
PvmBadParam
invalid value for where argument.
PvmSysErr
pvmd not responding.
PvmNoHost
specified host not in virtual machine.

SEE ALSO

pvm_config(3PVM) and pvm_tidtohost(3PVM)


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