在V8中为什么Isolate :: GetCurrent（）返回NULL？ [英] In V8 why does Isolate::GetCurrent() return NULL?

问题描述

我在Ubuntu上编译了 V8 ，并且有一个非常简单的V8程序，名为isolate_test.cc 。它基于 Google的Hello World示例：

I have compiled V8 on Ubuntu and have a very simple V8 program called isolate_test.cc. It is based on the Hello World example from Google:

#include <v8.h> 
using namespace v8;

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

    V8::initialize();
    Isolate* isolate = Isolate::GetCurrent(); //Always returns NULL

    return 0; 
}

我用来编译此程序的命令是：

The command I use to compile this program is:

g++ -Iinclude -g isolate_test.cc -o isolate_test -Wl,--start-group out/x64.debug/obj.target/{tools/gyp/libv8_{base,snapshot},third_party/icu/libicu{uc,i18n,data}}.a -Wl,--end-group -lrt -lpthread

问题是 Isolate :: GetCurrent（） 返回 NULL 。为什么会发生这种情况，获得当前 Isolate 的正确方法是什么？

Problem is Isolate::GetCurrent() always returns NULL. Why does this happen and what is the correct way of getting the current Isolate?

我可以离开轨道，但我的第一个想法是这涉及到 Isolate :: GetCurrent（）无法从 libpthread 获取当前线程。

I could be way off track but my first thought is that this relates to Isolate::GetCurrent() being unable to get the current thread from libpthread.

更新：根据这个问题我添加了 V8 :: initialize（）作为程序中的第一个调用，但是这不是解决问题。

Update: As per this question I have added V8::initialize() as the first call in the program, however this does not solve the problem.

推荐答案

我有同样的问题。我真的不知道底层的原因，但这里的NULL表示未创建并输入默认隔离。显而易见的解决方法是手动执行

I have the same issue. I don't really know the underlying reason, but NULL here means default isolate was not created and entered. The obvious workaround is to do it manually

Isolate* isolate = Isolate::GetCurrent(); // returns NULL
if (!isolate) {
    isolate = Isolate::New();
    isolate->Enter();
}

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