private static int Recv(Thread current, ref Arch.ExceptionRegisters regs, UserPtr ptr_label, UserPtr userBuf, uint size)
{
Contract.Requires(current.VBinderState.Owner == current);
if (!current.Parent.Space.VerifyWrite(userBuf, size) || !current.Parent.Space.VerifyWrite(ptr_label, sizeof(int)))
{
return(-ErrorCode.EFAULT);
}
var b = current.VBinderState.NoPendingMessages();
if (b)
{
var entry = new VBinderCompletion(current, ptr_label, userBuf, size);
current.VBinderState.Completion = entry;
current.SaveState(ref regs);
current.AsyncReturn = true;
return(0);
}
else
{
var msg = current.VBinderState.TakeMessage();
Contract.Assert(msg.GhostTarget == current);
var length = msg.Length;
ptr_label.Write(current.Parent, msg.label);
userBuf.Write(current, new Pointer(msg.payload.Location), length);
msg.Recycle();
return(length);
}
}
private static int Recv(Thread current, ref Arch.ExceptionRegisters regs, UserPtr ptr_label, UserPtr userBuf, uint size)
{
Contract.Requires(current.VBinderState.Owner == current);
if (!current.Parent.Space.VerifyWrite(userBuf, size) || !current.Parent.Space.VerifyWrite(ptr_label, sizeof(int)))
return -ErrorCode.EFAULT;
var b = current.VBinderState.NoPendingMessages();
if (b)
{
var entry = new VBinderCompletion(current, ptr_label, userBuf, size);
current.VBinderState.Completion = entry;
current.SaveState(ref regs);
current.AsyncReturn = true;
return 0;
}
else
{
var msg = current.VBinderState.TakeMessage();
Contract.Assert(msg.GhostTarget == current);
var length = msg.Length;
ptr_label.Write(current.Parent, msg.label);
userBuf.Write(current, new Pointer(msg.payload.Location), length);
msg.Recycle();
return length;
}
}