NOTIFY (3)
Request notification of PVM event such as host failure.
SYNOPSIS
B
C int info = pvm_notify( int what, int msgtag, int cnt, int *tids )
Fortran call pvmfnotify( what, msgtag, cnt, tids, info )
PARAMETERS
Type of event to trigger the notification.
Presently one of:
0.5i 2.5i
Value Meaning
PvmTaskExit Task exits or is killed
PvmHostDelete Host is deleted or crashes
PvmHostAdd New host is added
Message tag to be used in notification.
For PvmTaskExit and PvmHostDelete,
specifies the length of the tids array.
For PvmHostAdd,
specifies the number of times to notify.
For PvmTaskExit and PvmHostDelete,
an array of length
cnt
of task or pvmd TIDs to be notified about.
The array is not used with the PvmHostAdd option.
Integer status code returned by the routine.
Values less than zero indicate an error.
DESCRIPTION
The routine
pvm_notify
requests PVM to notify the caller on detecting certain events.
One or more notify messages (see below)
are sent by PVM back to the calling task.
The messages have tag msgtag supplied to notify.
The notification messages have the following format:
One notify message for each TID requested.
The message body contains a single TID of exited task.
One notify message for each TID requested.
The message body contains a single pvmd-TID of exited pvmd.
cnt notify messages are sent,
one each time the local pvmd's host table is updated.
The message body contains an integer length followed by a list of
pvmd-TIDs of new pvmds.
The counter of PvmHostAdd messages yet to be sent is
replaced by successive calls to pvm_notify.
Specifying a cnt
of -1 turns on PvmHostAdd messages until a future notify;
a count
of zero disables them.
TIDs in the notify messages are packed as integers.
The calling task is responsible for receiving messages
with the specified tag and taking appropriate action.
Future versions of PVM may expand the list of available
notification events.
EXAMPLES
C:
info = pvm_notify( PvmTaskExit, 9999, ntask, tids )
Fortran:
CALL PVMFNOTIFY( PVMHOSTDELETE, 1111, NUMHOSTS, DTIDS, INFO )
ERRORS
giving an invalid argument value.
SEE ALSO
pvm_tasks(3PVM) pvm_config(3PVM)
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