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Tutorials



MAILBOX




A mailbox is a communication mechanism that allows messages to be exchanged between processes. Data can be sent to a mailbox by one process and retrieved by another.

Mailbox is a built-in class that provides the following methods:
--Create a mailbox: new()
--Place a message in a mailbox: put()
--Try to place a message in a mailbox without blocking: try_put()
--Retrieve a message from a mailbox: get() or peek()
--Try to retrieve a message from a mailbox without blocking: try_get() or try_peek()
--Retrieve the number of messages in the mailbox: num()


EXAMPLE:
program meain ;
mailbox my_mailbox;
initial begin
my_mailbox = new();
if (my_mailbox)
begin
fork
put_packets();
get_packets();
#10000;
join_any
end

#(1000);
$display("END of Program");
end

task put_packets();
integer i;
begin
for (i=0; i<10; i++)
begin
#(10);
my_mailbox.put(i);
$display("Done putting packet %d @time %d",i, $time);

end
end
endtask

task get_packets();
integer i,packet;
begin
for (int i=0; i<10; i++)
begin
my_mailbox.get(packet);
$display("Got packet %d @time %d", packet, $time);
end
end
endtask
endprogram

RESULTS:

Done putting packet 0 @time 10
Got packet 0 @time 10
Done putting packet 1 @time 20
Got packet 1 @time 20
Done putting packet 2 @time 30
Got packet 2 @time 30
Done putting packet 3 @time 40
Got packet 3 @time 40
Done putting packet 4 @time 50
Got packet 4 @time 50
Done putting packet 5 @time 60
Got packet 5 @time 60
Done putting packet 6 @time 70
Got packet 6 @time 70
Done putting packet 7 @time 80
Got packet 7 @time 80
Done putting packet 8 @time 90
Got packet 8 @time 90
Done putting packet 9 @time 100
Got packet 9 @time 100
END of Program


Index
Introduction
Data Types
Literals
Strings
Userdefined Datatypes
Enumarations
Structures And Uniouns
Typedef
Arrays
Array Methods
Dynamic Arrays
Associative Arrays
Queues
Comparison Of Arrays
Linked List
Casting
Data Declaration
Reg And Logic
Operators 1
Operators 2
Operator Precedency
Events
Control Statements
Program Block
Procedural Blocks
Fork Join
Fork Control
Subroutines
Semaphore
Mailbox
Fine Grain Process Control

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