systemc 模块如何等待异步事件？

Question

systemc 模块等待来自外部/异步线程的事件

实现systemc模块等待来自外部/异步线程的事件

即：systemc模块等待外部指令，保持活动状态，并在需要时完成指令。

Answer 1

这是例子：

#include <systemc.h>
#include <pthread.h>
#include <unistd.h>

using namespace std;
class ThreadSafeEventIf : public sc_interface {
        virtual void notify(sc_time delay = SC_ZERO_TIME) = 0;
        virtual const sc_event &default_event(void) const = 0;
    protected:
        virtual void update(void) = 0;
};

class ThreadSafeEvent : public sc_prim_channel, public ThreadSafeEventIf {
    public:
        ThreadSafeEvent(const char *name = ""): event(name) {}

        void notify(sc_time delay = SC_ZERO_TIME) {
            this->delay = delay;
            async_request_update();
        }

        const sc_event &default_event(void) const {
            return event;
        }
    protected:
        virtual void update(void) {
            event.notify(delay);
        }
        sc_event event;
        sc_time delay;
};

sc_event GenScEvent;
sc_event workingFinishEvent;  // finish event
int workingFlag = 0;  // maybe dnot need a lock

SC_MODULE(Foo) {
    public:
        SC_CTOR(Foo) {
            SC_THREAD(main);

            SC_METHOD(eventTriggered);
            sensitive << threadSafeEvent;
            dont_initialize();
        }
    private:
        void main() {   //extra forever thread to avoid simulation exit
            while (1) {
                usleep(1*1000*1000);  // check if there is any instruction every one sec.
                wait(SC_ZERO_TIME);
                if(workingFlag){    // check working
                    wait(workingFinishEvent);  // wait the working finish 
                }
                usleep(1*1000*1000);
            }
        }

        void eventTriggered() {
            // printf("Foo: Got event from pthread \n");
            GenScEvent.notify();
        }
    public:
        ThreadSafeEvent threadSafeEvent;
};

void* PollingThread(void* arg) {
    int cnt = 0;
    while (1) {
        cnt++;
        printf("[POLL]: %d: Before generating event from PollingThread \n", cnt);
        usleep(3*1000*1000);
        Foo *foo = (Foo*)(arg);
        foo->threadSafeEvent.notify();
        printf("[POLL]: %d: Event notified from PollingThread \n", cnt);

    }
};

class sc_top : public sc_module {
    private:
        SC_HAS_PROCESS(sc_top);
    public:
        sc_top(sc_module_name name="SCTOP"): sc_module(name) {
            SC_THREAD(processing_thread);
        }
        void processing_thread();
};

void sc_top::processing_thread() {
    int cnt =0;
    while (1) {
        printf("[PROC]: processing_thread called \n");
        cout << "[PROC]: Wait GenScEvent  time: " << sc_time_stamp();
        wait(GenScEvent);
        workingFlag = 1;
        cnt++;
        wait(10, SC_SEC);  // advance simulation time
        cout << "[PROC]: Got and Finish "<<cnt << " GenScEvent   time: " << sc_time_stamp();
        workingFinishEvent.notify();
        workingFlag = 0;
    }
}

int sc_main(int argc, char *argv[]) {
    Foo foo("foo");
    sc_top u_sc_top("u_sc_top");

    pthread_t thread;
    pthread_create(&thread, NULL, PollingThread, &foo); 

    sc_start();

    return 0;
}