Forever task missing the register value change

SystemVerilog
1

Whenever rst1 is deasserted it should store register values.
if there is any change in register value in between this it should look for any change in register values and whenever there is change it should store updated value in array.
In between if reset get asserted array should hold stored values.i.e – value should not get updated to reset values.
Problem: In my simulation during first reset register value is changing in between 2 times. So, reg_instance. val_changed_e This should happen two times when register value is changing but its getting triggered only initially when the reset is deasseted.
All register threads are running in parallel but its missing 2nd register value change.
Could you please help why its happening even if all register threads are running in parallel?


reg                regs[$]; // reg n field are all uvm ral model predefined classes
reg                reg_instance;
field              fields[$];
field              fields_data[$];
field              reg_fields[string][string];

task  read_ register_fields();
  forever begin
       @(posedge rst1 iff rst1=== 1'b1) begin
               foreach (reg_fields[register_name]) begin
                              fork
                              automatic string reg_name = register_name;
                                forever begin
                                                @(reg_name. val_changed_e);predefined event
                                                                if (rst1=== 1'b1) begin
                                                               fork
                                                                               foreach (reg_fields[reg_name][reg_field_wr]) begin
                                                                                             automatic string reg_field= reg_field_wr;
                                                                                               //reg_val = reg_instance.get();
                                                                                               reg_val = reg_fields[reg_name][reg_field].get();
                                                                                               store_reg_val[reg_field] = reg_val;
                                                                                                `pmc_info(("Register event happened::  reg_name:: %s, field_name:: %s , REG_VAL:: %x , STORE_VAL:::::%p\t",  reg_name, reg_field, reg_val,store_reg_val));
                                                                               end
                                                                join_none
                                               end
                                                end
                                                join_none
                               end
                end
end//forever
endtask:read_register_fields
2

In reply to vineet_sharma:

Can you try changing second fork-join? or just add print statement after “@(reg_name. val_changed_e)” to make sure whether it is really triggered once?

reg                regs[$]; // reg n field are all uvm ral model predefined classes
reg                reg_instance;
field              fields[$];
field              fields_data[$];
field              reg_fields[string][string];
 
task  read_ register_fields();
  forever begin
       @(posedge rst1 iff rst1=== 1'b1) begin
               foreach (reg_fields[register_name]) begin
                              fork
                              automatic string reg_name = register_name;
                                forever begin
                                                @(reg_name. val_changed_e);predefined event
                                                                if (rst1=== 1'b1) begin
                                                               
                                                                               foreach (reg_fields[reg_name][reg_field_wr]) begin
                                                                                             automatic string reg_field= reg_field_wr;
                                                                               fork
                                                                                               //reg_val = reg_instance.get();
                                                                                               reg_val = reg_fields[reg_name][reg_field].get();
                                                                                               store_reg_val[reg_field] = reg_val;
                                                                                                `pmc_info(("Register event happened::  reg_name:: %s, field_name:: %s , REG_VAL:: %x , STORE_VAL:::::%p\t",  reg_name, reg_field, reg_val,store_reg_val));
                                                                               
                                                                join_none
                                                           end
                                               end
                                                end
                                                join_none
                               end
                end
end//forever
endtask:read_register_fields