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TIBCO Rendezvous® 8.8.0

# tibrvftMonitorCallback

Function Type

## Declaration

    typedef void (*tibrvftMonitorCallback) (
        tibrvftMonitor       monitor,
        const char*          groupName,
        tibrv_u32            numActiveMembers,
        void*                closure);

## Purpose

Process fault tolerance events for a monitor.

## Remarks

A program must define a function of this type as a prerequisite for monitoring a fault tolerance group. Programs register a monitor callback function with each call to `tibrvftMonitor_Create().`

Rendezvous fault tolerance software queues a monitor event whenever the number of active members in the group changes.

A program need not be a member of a group in order to monitor that group. Programs that do not monitor need not define a monitor callback function.

Parameter | Description
`monitor` | This parameter receives the monitor object.
`groupName` | This parameter receives a string denoting the name of the fault tolerance group.
`numActiveMembers` | This parameter receives the number of group members now active.
`closure` | This parameter receives the closure data, which the program supplied in the call that created the monitor object.

## See Also

tibrvftMonitor_Create()

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