CODEWITHSUNDEEP
csocketswinapiwinsockiocp
Steve
Steve

Reputation: 731

How to know if a WSASend() operation has been completed without calling GetQueuedCompletionStatus()?

When calling WSASend(), I have to pass it a WSAOVERLAPPED instance, and I cannot re-use this WSAOVERLAPPED instance until the previous WSASend() operation has been completed (i.e. when a completion packet has been placed in the completion port).

Is there a way I can know if the WSASend() operation has been completed without calling GetQueuedCompletionStatus()?

Upvotes: 1

Views: 460

Answers (2)

Mathieu
Mathieu

Reputation: 9629

You can use WSAGetOverlappedResult to get the WSASend progression:

/* size bytes to send */
WSASend(Sock, &aBuf, 1, NULL, 0, &overlap, NULL);

/* warning no test for error cases */
DWORD dummy;
DWORD sent;   
do 
{
    /* Ask for the sending progression without waiting */
    WSAGetOverlappedResult(Sock, &SendOverlapped, &sent, FALSE, &dummy);
    /* to prevent too much CPU usage */
    Sleep(15);
} while (size != sent);

Upvotes: 1

RbMm
RbMm

Reputation: 33716

you need bind own socket to system created IOCP as result when operation finished your callback will be called automatic. you have 2 options here:

after you create socket by 

SOCKET socket = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, 0, WSA_FLAG_OVERLAPPED)

you need call BindIoCompletionCallback((HANDLE)socket, *,0) or CreateThreadpoolIo((HANDLE)socket, *, 0, 0);

and all. you not need call GetQueuedCompletionStatus() or wait at all

Upvotes: 2

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