在V8

Question

使用TerminateExecution的我與此刻的V8試驗。我希望能夠在一個線程中運行一些（可能是長期運行的）javascript，然後能夠從另一個線程隨意「優雅地」終止執行。

我已經寫了這個簡單的代碼片段，測試儲物櫃的概念和TerminateExecution的用法：

void breaker(Isolate* isolate, int tid) { 

    getchar();  //wait for keyboard input on stdin 

    std::cout << "Breaking V8 execution" << std::endl; 

    v8::Locker locker(isolate);  //lock the isolate 
    v8::V8::TerminateExecution(tid); //and terminate it 
} 

int main(int argc, char **argv) { 

    if(argc != 2) { 
     std::cout << "No script name given" << std::endl; 
     return 1; 
    } 

    Isolate* isolate = Isolate::New();    //create a new isolate 
    Isolate::Scope isolateScope(isolate);   //enter it 

    v8::Locker locker(isolate);     //lock the isolate 
    v8::Locker::StartPreemption(100);    //and start preemption 

    v8::HandleScope handle_scope(isolate);  //open a new handle scope 


    /*** inject a console object into the global context ***/ 
    v8::Handle<v8::ObjectTemplate> globalTemplate = v8::ObjectTemplate::New(); 

    Handle<Context> context = Context::New(NULL, globalTemplate); 
    v8::Context::Scope context_scope(context); 

    Console* console = new Console; 
    Handle<Object> jsConsole = wrap_console(isolate, console); 
    expose_property(jsConsole, String::New("log"), InvocationCallback(Console::consoleLog)); 
    context->Global()->Set(String::New("console"), jsConsole, v8::ReadOnly); 
    /*******************************************************/ 


    //read a javascript file supplied via console 
    std::string contents = read_file(argv[1]); 
    v8::Handle<v8::String> js = v8::String::New(contents.c_str()); 

    v8::TryCatch try_catch; 
    v8::Handle<v8::Script> script = v8::Script::Compile(js); 

    if(script.IsEmpty()) { 
     report_exception(try_catch); 
    } 

    //start the breaker thread 
    std::thread th(breaker, isolate, v8::V8::GetCurrentThreadId()); 

    log_info("running script"); 
    script->Run(); 
    log_info("Script execution finished"); 

    th.join(); 
} 

但是，我總是在terminateExecution()呼叫段錯誤。我在這裏做錯了什麼？

感謝您的幫助

Answer 1

的v8::V8::GetCurrentThreadId()和v8::V8::TerminateExecution(int)方法已經從V8 API中刪除。我建議你不要使用它們。搶先功能對於這個世界可能也不長。

相反，只需調用v8::V8::TerminateExecution(v8::Isolate*)。並且不要將隔離鎖定在斷路器線程中，因爲這樣做會阻塞，直到跑步者線程釋放隔離區，直到腳本執行完成後纔會執行隔離。