I use tlm_extension to set/get trans extension, when does the memeory I new to delete?

[Allen yang]

Here is my code.

I set my own extension and use new to create an object, but I don't know when to call delete operator to free it.

https://www.edaplayground.com/x/8ur8

[Allen yang]

I really need your help when tlm_extension_base call free function to release the new memory. Thanks!

[Allen yang]

OK. I have read the source code of systemc. And I found that ~tlm_generic_payload will call extension free.

Quote

 

//--------------

// Destructor

//--------------

tlm_generic_payload::~tlm_generic_payload() {

    for(unsigned int i=0; i<m_extensions.size(); i++)

        if(m_extensions[i]) m_extensions[i]->free();

}

 

 

[David Black]

This depends slightly on the coding style (Loosely timed (LT) vs Approximately Timed (AT)) and the extension classification. For AT, if you use the auto-extension mechanism, then the memory manager can do this for you. For sticky extensions, you don't remove the extension at all because it gets reused. For LT, it should be done in the component that creates the extension when the transaction is closing.

This is a relatively complex topic, which is covered in the Doulos TLM Adopter course, among other places.

[Note: I work as an instructor at Doulos.]

[Allen yang]

I'm very appreciate your advice. Do you have any links about the Doulos TLM Adopter course?

[David Black]

https://www.doulos.com/training/soc-design-and-verification/systemc-tlm-20/