diff options
| author |   Simon Rozman <simon@rozman.si> | 2020-11-18 17:35:42 +0100 |
|---|---|---|
| committer |   Jason A. Donenfeld <Jason@zx2c4.com> | 2020-11-27 14:52:03 +0100 |
| commit | ecf70261da7b42db080df5047685850ab39b58fe (patch) | |
| tree | c541455593bceabf96906fa74b3df8803a49686f | |
| parent | api: allow header to be mit (diff) | |
| download | wintun-ecf70261da7b42db080df5047685850ab39b58fe.tar.xz wintun-ecf70261da7b42db080df5047685850ab39b58fe.zip | |
api: skip notifying driver when there are no receive packets yet
Signed-off-by: Simon Rozman <simon@rozman.si>
| -rw-r--r-- | api/session.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/api/session.c b/api/session.c index c48d5cb..a900a0a 100644 --- a/api/session.c +++ b/api/session.c @@ -293,8 +293,10 @@ WintunSendPacket(_In_ TUN_SESSION *Session, _In_ const BYTE *Packet) TUN_RING_WRAP(Session->Receive.TailRelease + AlignedPacketSize, Session->Capacity); Session->Receive.PacketsToRelease--; } - WriteULongRelease(&Session->Descriptor.Receive.Ring->Tail, Session->Receive.TailRelease); - if (ReadAcquire(&Session->Descriptor.Receive.Ring->Alertable)) - SetEvent(Session->Descriptor.Receive.TailMoved); + if (Session->Descriptor.Receive.Ring->Tail != Session->Receive.TailRelease) { + WriteULongRelease(&Session->Descriptor.Receive.Ring->Tail, Session->Receive.TailRelease); + if (ReadAcquire(&Session->Descriptor.Receive.Ring->Alertable)) + SetEvent(Session->Descriptor.Receive.TailMoved); + } LeaveCriticalSection(&Session->Receive.Lock); } |