TASKS (3)
Returns information about the tasks running
on the virtual machine.
SYNOPSIS
B
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
Integer specifying what tasks to return information about.
The options are:
0.5i 1.5i
0 for all the tasks on the virtual machine
pvmd tid for all tasks on a given host
tid for a specific task
Integer returning the number of tasks being reported on.
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.
Integer returning task ID of one task
Integer returning parent task ID
Integer returning pvmd task ID of host task is on.
Integer returning status of task
Character string returning the name of spawned task.
Manually started tasks return blank.
Integer status code returned by the routine.
Values less than zero indicate an error.
DESCRIPTION
The routine
pvm_tasks
returns information about
tasks presently running on 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.
Note that in Fortran the reported value of ntask and the set of tasks
do not change until the function resets at the end of a complete cycle.
The user can reset pvmftasks() at any time by calling it with
ntask = -1.
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
invalid value for where argument.
specified host not in virtual machine.
SEE ALSO
pvm_config(3PVM) pvm_tidtohost(3PVM)
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