标签：fork 26 join display e1 event wait

fork join

`include "exp_inside/tbb.sv"
class ClassBase;

    virtual function void disp();
        $display("the base print");
    endfunction: disp

endclass : ClassBase

class ClassEx1 extends ClassBase;

    function void disp();
        $display("the ex1 print");
    endfunction: disp

endclass : ClassEx1

class ClassEx2 extends ClassEx1;

    function void disp();
        $display("the ex2 print");
    endfunction: disp

    extern function int calc();

endclass : ClassEx2

function int ClassEx2::calc();
    $display("this is a calc");
    return 10;
endfunction

module taa ();
    initial begin
        ClassBase cb=new;
        ClassBase ce1=new;
        ClassEx2 ce2=new;
        cb=ce2;
        cb.disp;
        ce1=ce2;
        ce1.disp;
        $display("ce2.calc() ans %d", ce2.calc());
    end

    initial begin
        event e1;
        ForkJoin fj1=new(e1);
        fj1.fork_join;
        #100
        fj1.wait_and_disable;
        #100
        fj1.event_access;
        -> e1;
    end
endmodule

class ForkJoin;
    // data or class properties
    event e1;
    // initialization
    function new(event e1);
        this.e1=e1;
    endfunction : new

    task event_access();
        $display("event wait.");
        fork
            @e1;
            $display("event e1 is traggerd");
        join

        $display("pass");
    endtask: event_access

    task wait_and_disable();
        fork
            #1 $display("this is a fork in wait_and_disable");
        join

        fork
            #2 $display("this is a fork in #2");
        join

        fork
            #1 $display("#1 in wait ");
        join

        $display("before");
        wait fork;
        $display("wait finished");

        fork
            #10 $display("#10");
            #1 $display("#1");
        join_none

        disable fork;
        $display("disable finished");
        
    endtask: wait_and_disable

    task automatic fork_join();

        fork
            $display("thread1 start");
            #10 $display("this is a 10 in fork join");
            #5 $display("this is a 5 in fork join");
        join

        fork
            #6 $display("this is a 6 in fork join_any");
            #3 $display("this is a 3 in fork join_any");
        join_any
        #0 $display("parent in #0 print");
        $display("this is a parent thread in 0");

        fork
            #0 $display("thread3 start");
            #1 $display("thread3 in #1 ");
        join_none

        #1 $display("this is a p2 in #1");
        #0 $display("this is a #0 in parent thread");
    endtask: fork_join

endclass

输出

the ex2 print
the ex2 print
this is a calc
ce2.calc() ans          10
thread1 start
this is a 5 in fork join
this is a 10 in fork join
this is a 3 in fork join_any
parent in #0 print
this is a parent thread in 0
thread3 start
this is a p2 in #1
thread3 in #1 
this is a #0 in parent thread
this is a 6 in fork join_any
this is a fork in wait_and_disable
this is a fork in #2
#1 in wait 
before
wait finished
disable finished
event wait.
event e1 is traggerd

 不要考验ForkJoin

        fork
            $display("a");
        join_none
        $display("b");
        fork
            #0
            #1 $display("a");
        join_none
        #1 
        #0 $display("b");


        fork
            #1 $display("aa");
        join_none
        #1 $display("bb");

输出

b
a
a
b
bb
aa

标签：fork,26,join,display,e1,event,wait
来源： https://www.cnblogs.com/bai2022/p/15748569.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。