Synchronization Classes

The UVM provides event and barrier synchronization classes for managing concurrent processes.

  • uvm_event#(T) - UVM’s event class augments the SystemVerilog event datatype with such services as setting callbacks and data delivery.
  • uvm_barrier - A barrier is used to prevent a pre-configured number of processes from continuing until all have reached a certain point in simulation.
  • uvm_event_pool and uvm_barrier_pool - The event and barrier pool classes are specializations of uvm_object_string_pool #(T) used to store collections of ~uvm_event#(uvm_object)~s and uvm_barriers, respectively, indexed by string name.  Each pool class contains a static, “global” pool instance for sharing across all processes.
  • uvm_event_callback - The event callback is used to create callback objects that may be attached to uvm_event#(T)s.
Summary
Synchronization Classes
class uvm_event#(
    type  T  =  uvm_object
) extends uvm_event_base
The uvm_event class is an extension of the abstract uvm_event_base class.
class uvm_barrier extends uvm_object
The uvm_barrier class provides a multiprocess synchronization mechanism.
class uvm_object_string_pool #(
    type  T  =  uvm_object
) extends uvm_pool #(string,T)
This provides a specialization of the generic uvm_pool #(KEY,T) class for an associative array of uvm_object-based objects indexed by string.
virtual class uvm_event_callback#(
    type  T  =  uvm_object
) extends uvm_object
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.