Returns the number of messages currently in the mailboxīlocking method that stores a message in the mailbox in FIFO order message is any singular expression Returns a mailbox handle, bound > 0 represents size of mailbox queue SystemVerilog Mailbox Functions and Methods Ncsim: *W,RNQUIE: Simulation is complete.
Thread1: Got item #3, size=1 Thread1: Got item #4, size=0 The rate of items being put into the mailbox is 1 every ns
Block1: This block keeps putting items into the mailbox Create a new mailbox that can hold utmost 2 items Two processes are concurrently active in the example shown below, where one initial block puts data into the mailbox and another initial block gets data from the mailbox. Where is a mailbox used ?Ī SystemVerilog mailbox is typically used when there are multiple threads running in parallel and want to share data for which a certain level of determinism is required. Moreover, you cannot access a given index within the mailbox queue, but only retrieve items in FIFO order. However, a mailbox is a built-in class that uses semaphores to have atomic control the push and pop from the queue. A simple queue can only push and pop items from either the front or the back. Parameterized Mailbox that can accept items of only a specific data typeĪlthough a SystemVerilog mailbox essentially behaves like a queue, it is quite different from the queue data type.Generic Mailbox that can accept items of any data type.However, an unbounded mailbox has unlimited size. A bounded mailbox can only store a limited amount of data, and if a process attempts to store more messages into a full mailbox, it will be suspended until there's enough room in the mailbox. SystemVerilog mailboxes are created as having either a bounded or unbounded queue size.
It is similar to a real postbox where letters can be put into the box and a person can retrieve those letters later on. A SystemVerilog mailbox is a way to allow different processes to exchange data between each other.
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