next_trigger() is used with process methods, one's which are not threads. The function next_trigger does not suspend the method process instance; a method process cannot be suspended, but always executes to completion before returning control to the kernel. This is different from wait() method used with threads.

• next_trigger() : In the absence of static sensitivity for this particular process instance, the process shall not be triggered again during the current simulation.
• next_trigger(event) : The process shall be triggered when the event passed as an argument is notified.
• next_trigger(double,sc_time_unit) : The process shall be triggered when specified time has elapsed.
• next_trigger(double,sc_time_unit, event) : The process shall be triggered when the given event is notified or after given time, which ever occurs first.

  1 #include <systemc.h>
  2 
  3 SC_MODULE (next_trigger_example) {
  4   sc_in<bool> clock;
  5 
  6   sc_event  e1,e2;
  7   int cnt;
  8 
  9   void do_test1() {
 10     switch (cnt) {
 11       case 0 : cout << "@" << sc_time_stamp() <<" Default trigger clk triggered"<<endl;
 12                next_trigger(e1);
 13                break;
 14       case 1 : cout << "@" << sc_time_stamp() <<" Event e1 triggered"<<endl;
 15                next_trigger(10, SC_NS);
 16                break;
 17       case 2 : cout << "@" << sc_time_stamp() <<" Event e1 occured or time 10ns passed"<<endl;
 18                next_trigger(e1 | e2);
 19                break;
 20       case 3 : cout << "@" << sc_time_stamp() <<" Event e1 or e2 triggered"<<endl;
 21                break;
 22       default :cout << "@" << sc_time_stamp() <<" Default trigger clk triggered"<<endl;
 23                break;
 24     }
 25     cnt ++;
 26   }
 27 
 28   void do_test2() {
 29     while (true) {
 30       wait(2);
 31       // Trigger event e1
 32       cout << "@" << sc_time_stamp() <<" Triggering e1"<<endl;
 33       e1.notify();
 34       wait(20);
 35       cout << "@" << sc_time_stamp() <<" Triggering e2"<<endl;
 36       e2.notify();
 37       // Wait for  2 posedge of clocks
 38       wait(2);
 39       cout << "@" << sc_time_stamp() <<" Terminating simulation"<<endl;
 40       sc_stop(); // sc_stop triggers end of simulation
 41     }
 42   }
 43 
 44   SC_CTOR(next_trigger_example) {
 45     cnt = 0;
 46     SC_METHOD(do_test1);
 47       sensitive << clock;
 48     SC_CTHREAD(do_test2,clock.pos());
 49   }
 50 }; 
 51 
 52 int sc_main (int argc, char* argv[]) {
 53   sc_clock clock ("my_clock",1,0.5);
 54 
 55   next_trigger_example  object("wait");
 56     object.clock (clock.signal());
 57 
 58   sc_start(0); // First time called will init schedular
 59   sc_start();  // Run the simulation till sc_stop is encountered
 60   return 0;// Terminate simulation
 61 }

 @0 s Default trigger clk triggered
 @2 ns Triggering e1
 @2 ns Event e1 triggered
 @12 ns Event e1 occured or time 10ns passed
 @22 ns Triggering e2
 @22 ns Event e1 or e2 triggered
 @22500 ps Default trigger clk triggered
 @23 ns Default trigger clk triggered
 @23500 ps Default trigger clk triggered
 @24 ns Default trigger clk triggered
 @24 ns Terminating simulation
 SystemC: simulation stopped by user.

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Deepak Kumar Tala - All rights reserved

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