2
下面的代碼在OS X中起作用,但是當我編譯&在Ubuntu中運行時,在調用baton->callback
函數時出現段錯誤。看起來Persistent<Function>
不會超過最初的Aysnc::Start
方法。Calling Persistent <Function> AfterWork中的回調段錯誤
如果是這樣,爲什麼它在OS X上工作? 我該怎麼做才能使其跨平臺工作?
如果我做錯了,我需要做什麼才能使我的callback
可以從AfterWork
調用?
// Async.h
#include <v8.h>
#include <node.h>
#include <string>
using namespace node;
using namespace v8;
class Async : public ObjectWrap {
public:
static Persistent<Function> constructor_template;
static void Initialize(Handle<v8::Object> target);
protected:
Async() {}
~Async() {}
static Handle<Value> Start(const Arguments& args);
static void Work(uv_work_t* req);
static void AfterWork(uv_work_t* req);
private:
struct Baton {
uv_work_t request;
Persistent<Function> callback;
};
};
// Async.cc
Handle<Value> Async::Start(const Arguments& args) {
HandleScope scope;
if(args.Length() == 0 || !args[0]->IsFunction()) {
return ThrowException(Exception::Error(String::New("Callback is required and must be a Function.")));
}
Baton *baton = new Baton();
baton->request.data = baton;
baton->callback = Persistent<Function>::New(Handle<Function>::Cast(args[0]));
uv_queue_work(uv_default_loop(), &baton->request, Work, (uv_after_work_cb)AfterWork);
return Undefined();
}
void Async::Work(uv_work_t *req) {
printf("Work\n");
}
void Async::AfterWork(uv_work_t *req) {
printf("AfterWork\n");
HandleScope scope;
Baton *baton = static_cast<Baton *>(req->data);
delete req;
Local<Value> argv[1] = {
Local<Value>::New(Null());
};
TryCatch try_catch;
// Segfault occurs here
baton->callback->Call(Context::GetCurrent()->Global(), 1, argv);
if (try_catch.HasCaught()) {
node::FatalException(try_catch);
}
}