/** Enables a frame to be drawn. */
void SoundManagerSonix::update()
{
const vpr::Interval cur_time(vpr::Interval::now());
const vpr::Interval delta(cur_time - mLastFrameTime);
float delta_sec(0.0f);
if ( cur_time > mLastFrameTime )
{
delta_sec = delta.secf();
if ( delta_sec > 1.0f )
{
delta_sec = 1.0f;
}
}
mLastFrameTime = cur_time;
snx::sonix::instance()->step(delta_sec);
}
vpr::Uint32 SerialPortImplWin32::read_i(void* buffer, const vpr::Uint32 length,
const vpr::Interval& timeout)
{
unsigned long bytes;
// Shouldn't be setting this every read, but don't have any other way of
// specifying the timeout.
if ( vpr::Interval::NoTimeout != timeout )
{
COMMTIMEOUTS t;
GetCommTimeouts(mHandle, &t);
t.ReadTotalTimeoutConstant = (int)timeout.msec();
SetCommTimeouts(mHandle, &t);
}
if ( ! ReadFile(mHandle, buffer, length, &bytes, NULL) )
{
std::stringstream msg_stream;
msg_stream << "Failed to read from serial port " << mName << ": "
<< getErrorMessageWithCode(GetLastError());
throw IOException(msg_stream.str(), VPR_LOCATION);
}
//Now set the timeout back
if ( vpr::Interval::NoTimeout != timeout )
{
COMMTIMEOUTS t;
GetCommTimeouts(mHandle, &t);
t.ReadTotalTimeoutConstant = (int)mCurrentTimeout*100;
SetCommTimeouts(mHandle, &t);
}
// XXX: Does reading 0 bytes really indicate a timeout?
if ( bytes == 0 )
{
std::stringstream msg_stream;
msg_stream << "Timeout while attempting to read from serial port "
<< mName;
throw TimeoutException(msg_stream.str(), VPR_LOCATION);
}
return bytes;
}
bool FileHandleImplUNIX::isWriteable(const vpr::Interval timeout) const
{
fd_set write_set;
int num_events;
struct timeval timeout_obj;
if ( mFdesc == -1 )
{
throw IOException("Invalid file handle.", VPR_LOCATION);
}
else
{
if ( timeout == vpr::Interval::NoWait )
{
timeout_obj.tv_sec = 0;
timeout_obj.tv_usec = 0;
}
else
{
if ( timeout.msec() >= 1000 )
{
timeout_obj.tv_sec = timeout.msec() / 1000;
timeout_obj.tv_usec = (timeout.msec() % 1000) * 1000000;
}
else
{
timeout_obj.tv_sec = 0;
timeout_obj.tv_usec = timeout.msec() * 1000;
}
}
FD_ZERO(&write_set);
FD_SET(mFdesc, &write_set);
// Watch to see if a write will block. Timeout is an upper bound on the amount of time
// elapsed before select returns. It may be zero, causing select to return
// immediately. (This is useful for polling.) If timeout is NULL (no timeout),
// select can block indefinitely.
num_events = select(mFdesc + 1, NULL, &write_set, NULL,
(timeout != vpr::Interval::NoTimeout) ? &timeout_obj :
NULL);
if ( num_events == 0 )
{
// Added in revision 1.33
// If timeout is vpr::Interval::NoWait(NULL) the file handle may be ready for
// writing even though select returned 0. This is vauge in the documentation
// because it says that calling select with a timeout of NULL will return
// immediately.
if ( ! FD_ISSET(mFdesc, &write_set) )
{
return false;
}
}
else if ( num_events < 0 )
{
// TODO: Test additional select errors.
// EBADF An invalid file descriptor was given in one of the sets.
// EINTR A non blocked signal was caught.
// EINVAL n is negative or the value contained within timeout is invalid.
// ENOMEM select was unable to allocate memory for internal tables.
throw IOException("Error while testing if file handle is writeable.", VPR_LOCATION);
}
}
return true;
}
vpr::Uint32 SocketDatagramImplBOOST::recvfrom(void* msg,
const vpr::Uint32 length,
vpr::InetAddr& from,
const vpr::Interval& timeout)
{
mBytesRead = 0;
// NOTE: It appears that binding the address of a stack variable
// (timer_result) to an asynchronous callback functor works here because
// the I/O service is being pumped by this method.
boost::optional<boost::system::error_code> timer_result;
boost::asio::deadline_timer timer(mUdpSocket->get_io_service());
timer.expires_from_now(boost::posix_time::microseconds(timeout.msec()));
timer.async_wait(boost::bind(&SocketDatagramImplBOOST::setResult, this,
&timer_result, _1, -1));
// Same situation for read_result.
boost::optional<boost::system::error_code> read_result;
mUdpSocket->async_receive_from(boost::asio::buffer(msg, length),
from.mUdpAddr,
boost::bind(&SocketDatagramImplBOOST::setResult,
this, &read_result, _1, _2));
mUdpSocket->get_io_service().reset();
static bool cancel_supported(true);
while (mUdpSocket->get_io_service().run_one())
{
if (read_result)
{
timer.cancel();
}
else if (timer_result)
{
if (cancel_supported)
{
try
{
mUdpSocket->cancel();
}
catch (std::exception & ex)
{
vprDEBUG(vprDBG_ALL, vprDBG_CONFIG_STATUS_LVL)
<< "[SocketDatagramImplBOOST] caught an exception "
<< "cancelling UDP socket, switching to pre-Vista mode..."
<< std::endl << vprDEBUG_FLUSH;
cancel_supported = false;
}
}
if (! cancel_supported)
{
const bool was_bound(isBound());
mUdpSocket->shutdown(boost::asio::ip::udp::socket::shutdown_both);
mUdpSocket->close();
this->close();
this->open();
if (was_bound)
{
this->bind();
}
}
throw TimeoutException("recvfrom operation timed out", VPR_LOCATION);
}
}
return mBytesRead;
}