Immediate self-notification handling

[katang]

I am using a FIFO in my design and in some cases I need to push back the slightly modified content to the FIFO.

 I understand that sending immediate self-notification  should be avoided. To do so, I modified the sample FIFO code as
 

     void write(FIFO_t* c) {
       if (num_elements == max)
         wait(FIFO_read_event);

       data[(first + num_elements) % max] = c;
       ++ num_elements;
//       wait(SCTIME_CLOCKTIME); // Avoid immediate notification
       FIFO_write_event.notify(SCTIME_CLOCKTIME);
     }

In the combination shown above,  I receive no warning. However, when I define the notification time by the wait() (now commented out)  and notify() brackets are empty, I receive the warning

Warning: (W536) immediate self-notification ignored as of IEEE 1666-2011:

My guess was that the two cases are equivalent. What is the difference? Maybe only the syntax is checked and not the time difference?

[Roman Popov]

Quote

My guess was that the two cases are equivalent

No, they are not equivalent. They notify different events:

wait ( time ); // notify active thread == self-notification

FIFO_write_event.notify (time); // notify FIFO_write_event

 

 

[katang]

Sorry. The question was bad.

I meant that the self-notification is delayed, so it is not immediate any more. Do I miss something?

[Roman Popov]

Probably SCTIME_CLOCKTIME expands to nothing in your case? 

[katang]

It is defined as
 

#define SCTIME_CLOCKTIME sc_time(100,sc_core::SC_PS)

 

[Roman Popov]

Then I have no idea.  Set breakpoint on this report and analyze why it gets there. From my perspective your code sample should work without Warnings.