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[/] [uart2bus_testbench/] [trunk/] [tb/] [uvm_src/] [base/] [uvm_event_callback.svh] - Rev 16
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//
//------------------------------------------------------------------------------
// Copyright 2007-2010 Mentor Graphics Corporation
// Copyright 2007-2010 Cadence Design Systems, Inc.
// Copyright 2010 Synopsys, Inc.
// All Rights Reserved Worldwide
//
// Licensed under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in
// writing, software distributed under the License is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See
// the License for the specific language governing
// permissions and limitations under the License.
//------------------------------------------------------------------------------
typedef class uvm_object;
typedef class uvm_event;
//------------------------------------------------------------------------------
//
// CLASS: uvm_event_callback
//
// The uvm_event_callback class is an abstract class that is used to create
// callback objects which may be attached to <uvm_event#(T)>s. To use, you
// derive a new class and override any or both <pre_trigger> and <post_trigger>.
//
// Callbacks are an alternative to using processes that wait on events. When a
// callback is attached to an event, that callback object's callback function
// is called each time the event is triggered.
//
//------------------------------------------------------------------------------
virtual class uvm_event_callback#(type T=uvm_object) extends uvm_object;
// Function: new
//
// Creates a new callback object.
function new (string name="");
super.new(name);
endfunction
// Function: pre_trigger
//
// This callback is called just before triggering the associated event.
// In a derived class, override this method to implement any pre-trigger
// functionality.
//
// If your callback returns 1, then the event will not trigger and the
// post-trigger callback is not called. This provides a way for a callback
// to prevent the event from triggering.
//
// In the function, ~e~ is the <uvm_event#(T)> that is being triggered, and ~data~
// is the optional data associated with the event trigger.
virtual function bit pre_trigger (uvm_event#(T) e, T data);
return 0;
endfunction
// Function: post_trigger
//
// This callback is called after triggering the associated event.
// In a derived class, override this method to implement any post-trigger
// functionality.
//
//
// In the function, ~e~ is the <uvm_event#(T)> that is being triggered, and ~data~
// is the optional data associated with the event trigger.
virtual function void post_trigger (uvm_event#(T) e, T data);
return;
endfunction
virtual function uvm_object create (string name="");
return null;
endfunction
endclass