Google Javascript v8 - 多线程
假设我有以下一段代码，
bool run (void)
{
HandleScope hande_scope;
Handle<String> source;
Local<Script> script;
Persistent<Context> context;
context = Context::New();
Context::Scope context_scope(context);
script = Script::Compile("var a = 1; var b = 2;");
Local<Value> result = script->Run();
if (result.IsEmpty())
return false;
else
return true;
}
是否真的无法使用多线程执行这段代码？似乎 HandleScope 并非设计用于多线程应用程序。 我可以使用 v8::Locker 和 v8::Unlocker 方法，但这总是会给我执行跟踪，如下所示：
t1: a = 1
t1: b = 2
t2: a = 1
t2: b = 2
我希望有人能给我一个关于获取这个的提示多线程代码，以便可能的执行跟踪如下所示：
t1: a = 1
t2: a = 1
t1: b = 2
t2: b = 2
Suppose I have the following piece of code
bool run (void)
{
HandleScope hande_scope;
Handle<String> source;
Local<Script> script;
Persistent<Context> context;
context = Context::New();
Context::Scope context_scope(context);
script = Script::Compile("var a = 1; var b = 2;");
Local<Value> result = script->Run();
if (result.IsEmpty())
return false;
else
return true;
}
Is it true that one cannot execute this code using multiple threads? It seems like HandleScope is not designed to be used in multithreaded applications.
I can use the v8::Locker and v8::Unlocker methodes but that would always give me execution traces as this:
t1: a = 1
t1: b = 2
t2: a = 1
t2: b = 2
I hope someone can give me a hint on getting this code multithreaded so that a possible execution trace could like this:
t1: a = 1
t2: a = 1
t1: b = 2
t2: b = 2
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根据 v8 问题 510，一项名为“隔离”的功能几个月前添加到后备箱。这应该允许在单个进程中存在 v8 的多个（非交互）实例。
According to v8 issue 510, a feature called "Isolates" was added to the trunk some months back. This should allow multiple (non-interacting) instances of v8 in a single process.
请查看这篇文章。 v8 引擎有一个 Locker 类，可让您抢占代码。这样您就可以使用多个线程。
Look at this post. The v8 engine has a Locker class, that lets you preempt your code. With this you can use multiple threads.