Free Source C WE ARE DEVELOPER
DIFFERENCE:
- wait() sử dụng cho 1 thread, next_trigger() sử dụng cho 1 method
- Không giống wait(), việc dùng next_trigger() không suspend 1 process
EXAMPLE:
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#include <systemc.h> SC_MODULE(next_trigger_and_wait) { sc_in<bool> clock; sc_event e1, e2; int cnt,cnt0; void do_wait_thread() { while (1) { cout << "[ THREAD] "<<sc_time_stamp().to_string()<<endl; switch (cnt0) { case 0: cout << " @" << sc_time_stamp() << " Default trigger clk triggered" << endl; wait(e1); break; case 1: cout << " @" << sc_time_stamp() << " Event e1 triggered" << endl; wait(10, SC_NS); break; case 2: cout << " @" << sc_time_stamp() << " Event e1 occured or time 10ns passed" << endl; wait(e1 | e2); break; case 3: cout << " @" << sc_time_stamp() << " Event e1 or e2 triggered" << endl; break; default:cout << " @" << sc_time_stamp() << " Default trigger clk triggered" << endl; cnt0 = 0; break; } cnt0++; cout << " THREAD : count ++" << sc_time_stamp().to_string()<<endl; } } void do_next_trigger_method() { cout << "[ METHOD] " << sc_time_stamp().to_string()<<endl; switch (cnt) { case 0: cout << " @" << sc_time_stamp() << " Default trigger clk triggered" << endl; next_trigger(e1); break; case 1: cout << " @" << sc_time_stamp() << " Event e1 triggered" << endl; next_trigger(10, SC_NS); break; case 2: cout << " @" << sc_time_stamp() << " Event e1 occured or time 10ns passed" << endl; next_trigger(e1 | e2); break; case 3: cout << " @" << sc_time_stamp() << " Event e1 or e2 triggered" << endl; break; default:cout << " @" << sc_time_stamp() << " Default trigger clk triggered" << endl; cnt = 0; break; } cnt++; cout << " METHOD : count ++" << sc_time_stamp().to_string()<<endl; } void event_thread() { while (true) { wait(2); // Trigger event e1 cout << "@" << sc_time_stamp() << " Triggering e1" << endl; e1.notify(); wait(20); cout << "@" << sc_time_stamp() << " Triggering e2" << endl; e2.notify(); // Wait for 2 posedge of clocks wait(2); cout << "@" << sc_time_stamp() << " Terminating simulation" << endl; sc_stop(); // sc_stop triggers end of simulation } } void clock_thread() { cout << "clock positive at : " << sc_time_stamp().to_string()<<endl; } SC_CTOR(next_trigger_and_wait) { cnt = 0; cnt0 = 0; SC_THREAD(do_wait_thread); SC_METHOD(clock_thread); sensitive << clock.pos(); SC_METHOD(do_next_trigger_method); SC_CTHREAD(event_thread, clock.pos()); } }; int sc_main(int argc, char* argv[]) { sc_clock clock("my_clock", 1, 0.5); next_trigger_and_wait object("wait"); object.clock(clock); sc_start(); // Run the simulation till sc_stop is encountered return 0;// Terminate simulation } |
OUTPUT:
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SystemC 2.3.2-Accellera --- Nov 27 2018 17:08:10 Copyright (c) 1996-2017 by all Contributors, ALL RIGHTS RESERVED Info: (I804) /IEEE_Std_1666/deprecated: sc_clock(const char*, double, double, double, bool) is deprecated use a form that includes sc_time or sc_time_unit clock positive at : 0 s [ METHOD] 0 s @0 s Default trigger clk triggered METHOD : count ++0 s [ THREAD] 0 s @0 s Default trigger clk triggered clock positive at : 0 s clock positive at : 1 ns clock positive at : 2 ns @2 ns Triggering e1 [ METHOD] 2 ns @2 ns Event e1 triggered METHOD : count ++2 ns THREAD : count ++2 ns [ THREAD] 2 ns @2 ns Event e1 triggered clock positive at : 3 ns clock positive at : 4 ns clock positive at : 5 ns clock positive at : 6 ns clock positive at : 7 ns clock positive at : 8 ns clock positive at : 9 ns clock positive at : 10 ns clock positive at : 11 ns [ METHOD] 12 ns @12 ns Event e1 occured or time 10ns passed METHOD : count ++12 ns THREAD : count ++12 ns [ THREAD] 12 ns @12 ns Event e1 occured or time 10ns passed clock positive at : 12 ns clock positive at : 13 ns clock positive at : 14 ns clock positive at : 15 ns clock positive at : 16 ns clock positive at : 17 ns clock positive at : 18 ns clock positive at : 19 ns clock positive at : 20 ns clock positive at : 21 ns clock positive at : 22 ns @22 ns Triggering e2 [ METHOD] 22 ns @22 ns Event e1 or e2 triggered METHOD : count ++22 ns THREAD : count ++22 ns [ THREAD] 22 ns @22 ns Event e1 or e2 triggered THREAD : count ++22 ns [ THREAD] 22 ns @22 ns Default trigger clk triggered THREAD : count ++22 ns [ THREAD] 22 ns @22 ns Event e1 triggered clock positive at : 23 ns clock positive at : 24 ns @24 ns Terminating simulation |
Analytics output log:
Khi 1 process gặp next_trigger(args)/wait(args) function, method/thread đó sẽ bị lock bởi điều kiện trong args. NHƯNG,
[+] Khi do_wait_thread() được gọi, cnt0 = 0 nên “Default trigger clk triggered” in ra màn hình, và sau đó, nó gặp wait(e1) và nó sẽ suspend ở đây.
[+] Không giống như wait(), khi do_next_trigger_method() được gọi, cnt = 0 nên “Default trigger clk triggered” in ra màn hình, và sau đó, nó gặp next_trigger(e1) nhưng nó sẽ KHÔNG suspend ở đây. Nó sẽ chạy đến hết do_next_trigger_method() function. “METHOD : count ++0 s “ in ra màn hình.
