Reuse of threads

Question

I’m making an addon for nodejs. One of the functions is responsible for parameterizing the incoming audio, from the various clients. I want this parameterization to be done in a thread.

void buffering(const FunctionCallbackInfo<v8::Value>& args) {

Isolate* isolate = Isolate::GetCurrent();
HandleScope scope(isolate);

int size = args[1]->NumberValue();
int final_read = args[2]->NumberValue();
int inicio_read = args[3]->NumberValue();
int client_id = args[4]->NumberValue();

Local<Object> bufferObj = args[0]->ToObject();

buf = node::Buffer::Data(bufferObj);
char mini_buf[80000];//char mini_buf[4096];
memcpy(mini_buf, buf, size);
//Função para a correr numa nova thread
int teste_buf = Julius[client_id].Audio_Buffering(mini_buf, size, final_read, inicio_read, client_id);

If the Audio_Buffering were executed only once I could do as follows:

std::thread t[num__threads];
t[client_id] = std::thread(&SREngineJulius::Audio_Buffering, &Julius[client_id], mini_buf, size, final_read,inicio_read,client_id);

The problem is that this function, for the same client, will be run multiple times (until the customer stream is over). A solution would be to iterate and create new threads, but in the long run it would create a lot of junk. Any way to reuse a thread? Or create and destroy right away?