我在寫一個小小的試用項目,我需要將值類型爲QueuList的對象按值傳遞給線程池線程。它是一個Boost線程池,我使用綁定將參數傳遞給線程。按值向另一個線程傳遞對象
出於某種原因,我似乎無法到我的項目傳遞給由值線程池線程...
任何人可以幫助我在做什麼錯?
void ConsumerScheduler()
{
int count = 0;
typedef boost::intrusive::list<QueuList> List;
while (true)
{
WaitForSingleObject(hConsumer, 2000); // Wait for hConsomuer to become > 0
{
//lock Queue
QueuList *item = NULL;
boost::mutex::scoped_lock lock(mtx);
{//Scope of lock
if (lst->size() == 0)
{
printf("List is emtpy");
continue;
}
else
{
List::iterator iter(lst->begin());
item = &*iter;
lst->pop_front(); //Item is removed from list, so pointer is no longer available!!!
printf("Popped item off list. List current size: %d\n",lst->size());
count++;
}
}
//Pass to threadpool
tpp.schedule(boost::bind(taskfunc,*item)); //it will not accept *item or item in this bind function to pass it by value
total--;
if (total == 0)
{
printf("Total is now zero!\nCount is %d\n", count);
}
if (count == 5)
break;
ReleaseSemaphore(hProducer,total , NULL); // Release the hProducer semaphore, possibly waking producer
}
}
}
//Thread pool thread function
void taskfunc(QueuList list)
{
boost::mutex::scoped_lock lock(mtx);
{
std::string name= list.GetName();
printf("Name gotten: %s",name);
}
}
我想按值傳遞的原因是使每一個線程池線程都有它自己的指針被從列表中的第一個函數刪除的對象的副本,這將導致一個錯誤,如果我通過引用傳遞。
請出示tpp'是如何定義'和編譯器的輸出 – 2010-10-05 14:03:58