我有一个套接字列表。(已打开的连接)
我有n个工作线程。
线程循环:
while (1)
{
_this.result = GetQueuedCompletionStatus(a_server.server_iocp, &_this.numberOfBytesTransfered,
&_this.completionKey, (OVERLAPPED**)&_this.iocp_task, INFINITE);
...
}
我有这个简单的结构:
struct iocp_send_global :public iocp_task<IOCP_SEND_GLOBAL> {
OVERLLAPED ov; //overlapped struct at top
std::atomic_uint32_t ref;
bool decr_ref(){ return ref.fetch_sub(1, std::memory_order_acq_rel) == 1;}
//packet data here
}
...
这是'广播'功能:
iocp_send_global * packet = new iocp_send_global;
[set packet data here]
for(int i=0;i<connectionsCount;++i){
WSASend(connections[i],...,&packet,...); //posting same packet to all connections
}
我想在GetQueuedCompletionStatus调用返回重叠结果后在worker循环中执行此操作;
if (_this.iocp_task->type == IOCP_SEND_GLOBAL) {
auto* task = (iocp_send_global*)_this.iocp_task;
if (!task->decr_ref()) {
_this.iocp_task = nullptr;
//dont delete the task yet,
//all send post must finish first
//[all posts share the same buffer]
}
else {
//delete the task containing the send data after all send posts finished
delete _this.iocp_task;
_this.iocp_task = nullptr;
}
}
根据我在Microsoft WSASend文档中读到的内容,每个WSASend重叠调用都应该传递自己的OVERLAPPED结构,但是当我WSASend相同的缓冲区时它是否有效?
谢谢!
答案 0 :(得分:2)
您必须为每个呼叫传递不同的OVERLAPPED
缓冲区,因为您将进行多个待处理呼叫。这在OVERLAPPED
结构的文档中清楚地说明了。