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SystemC sc_method schedule

jxker

Hi all,

 I have a question about systemC sc_method schedule.

In my work, event A will trigger sc_method A, event B will trigger sc_method B; and sc_method A and B both will modify a same global variable. My question is what if event A and B happens at the same time? which sc_method will be scheduled first? Can I control this schedule myself?

Parents

  • Hi jxker,

     

    If I understood you correctly, two SC_METHODs can modify a shared variable.

    -what if event A and B happens at the same time? 

    Based on SystemC simulation kernel, these two SC_METHODs are moved from waiting state into ready state.

    -which sc_method will be scheduled first? 

    Then one by one processes are randomly taken from the ready pool by designating them as running and invoked. Although not truly random.

     -Can I control this schedule myself?

    You've to manage access to shared resources via inter-process communication. It usually involves the use of signals which may lead to "wait()" calls that aren't allowed in SC_METHOD. Thus you might have to change these processes into SC_THREAD or SC_CTHREAD based on your design requirements coupled with a sensitivity list or clock edge.

     

    Hope this helps! 

     

    Note: Global variables aren't supported by Cadence C-to-Silicon Compiler. 

    Best Regards

    Ahmad Obeid 

Reply

  • Hi jxker,

     

    If I understood you correctly, two SC_METHODs can modify a shared variable.

    -what if event A and B happens at the same time? 

    Based on SystemC simulation kernel, these two SC_METHODs are moved from waiting state into ready state.

    -which sc_method will be scheduled first? 

    Then one by one processes are randomly taken from the ready pool by designating them as running and invoked. Although not truly random.

     -Can I control this schedule myself?

    You've to manage access to shared resources via inter-process communication. It usually involves the use of signals which may lead to "wait()" calls that aren't allowed in SC_METHOD. Thus you might have to change these processes into SC_THREAD or SC_CTHREAD based on your design requirements coupled with a sensitivity list or clock edge.

     

    Hope this helps! 

     

    Note: Global variables aren't supported by Cadence C-to-Silicon Compiler. 

    Best Regards

    Ahmad Obeid 

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