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-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: ch_19_fork-b.vhd,v 1.2 2001-10-26 16:29:36 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
architecture behavior of fork is
begin
forker : process
variable cumulative_probabilities : probability_vector(1 to probabilities'length);
variable destination : positive range out_arc'range;
variable probabilities_index : positive range probabilities'range;
variable number_of_tokens_forked : natural := 0;
type counter_array is array (positive range out_arc'range) of natural;
variable number_forked_to_destination : counter_array := (others => 0);
variable random_info : random_info_record;
variable random_number : real;
type transaction_vector is array (positive range <>) of boolean;
variable out_arc_transaction_driving_value : transaction_vector(out_arc'range)
:= (others => false);
use std.textio.all;
file info_file : text;
variable L : line;
procedure write_summary is
begin
write(L, string'("Summary information for fork "));
write(L, name);
write(L, string'(" up to time "));
write(L, now, unit => time_unit);
writeline(info_file, L);
write(L, string'(" Number of tokens forked = "));
write(L, natural(number_of_tokens_forked));
writeline(info_file, L);
for destination in out_arc'range loop
write(L, string'(" Number to output("));
write(L, destination);
write(L, string'(") = "));
write(L, number_forked_to_destination(destination));
write(L, string'(" ("));
write(L, real(number_forked_to_destination(destination))
/ real(number_of_tokens_forked),
digits => 4);
write(L, ')');
writeline(info_file, L);
end loop;
writeline(info_file, L);
end write_summary;
procedure write_trace is
begin
write(L, string'("Fork "));
write(L, name);
write(L, string'(": at "));
write(L, now, unit => time_unit);
write(L, string'(" forked to output "));
write(L, destination);
write(L, ' ');
write(L, in_arc.token, time_unit);
writeline(info_file, L);
end write_trace;
begin
assert probabilities'length = out_arc'length - 1
report "incorrent number of probabilities - should be "
& integer'image(out_arc'length - 1) severity failure;
cumulative_probabilities := probabilities;
for index in 2 to cumulative_probabilities'length loop
cumulative_probabilities(index) := cumulative_probabilities(index - 1)
+ cumulative_probabilities(index);
end loop;
init_uniform( random_info,
lower_bound => 0.0, upper_bound => 1.0, seed => seed );
file_open(info_file, info_file_name, write_mode);
loop
wait on info_detail'transaction, in_arc;
if info_detail'active and info_detail = summary then
write_summary;
end if;
if in_arc'event then
generate_random(random_info, random_number);
destination := out_arc'left;
for index in 1 to cumulative_probabilities'length loop
exit when random_number < cumulative_probabilities(index);
if out_arc'ascending then
destination := destination + 1;
else
destination := destination - 1;
end if;
end loop;
out_arc(destination) <= arc_type'( transaction => not out_arc_transaction_driving_value(destination),
token => in_arc.token );
out_arc_transaction_driving_value(destination) := not out_arc_transaction_driving_value(destination);
number_of_tokens_forked := number_of_tokens_forked + 1;
number_forked_to_destination(destination)
:= number_forked_to_destination(destination) + 1;
if info_detail = trace then
write_trace;
end if;
end if;
end loop;
end process forker;
end behavior;
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