public int DataAvailable(int timeout)
{
vfsMessageTypes.ReadWriteMessage rwm = new vfsMessageTypes.ReadWriteMessage();
rwm.buf = new byte[1];
rwm.buf_offset = 0;
rwm.count = 1;
tysos.Syscalls.DebugFunctions.DebugWrite("Console: KeyAvailable: called (timeout = " + timeout.ToString() + ")\n");
tysos.Syscalls.IPCFunctions.SendMessage(GetConsoleProcess(), new tysos.IPCMessage {
Type = vfsMessageTypes.PEEK, Message = rwm
});
/* Block on either receiving a character or the timeout, whichever comes first */
tysos.WaitAnyEvent wae = new tysos.WaitAnyEvent();
wae.Children.Add(rwm.completed);
wae.Children.Add(new tysos.TimerEvent(timeout));
tysos.Syscalls.SchedulerFunctions.Block(wae);
//lock (rwm.completed)
{
if (rwm.completed.IsSet)
{
tysos.Syscalls.DebugFunctions.DebugWrite("Console: KeyAvailable: returning true\n");
return((int)rwm.count);
}
rwm.completed.Set();
tysos.Syscalls.DebugFunctions.DebugWrite("Console: KeyAvailable: returning false\n");
return(0);
}
}
private void process_pending_reads()
{
while (pending_reads.Count > 0)
{
//lock (pending_awaits[0].completed)
{
vfsMessageTypes.ReadWriteMessage rwm = pending_reads[0].Message as vfsMessageTypes.ReadWriteMessage;
if (rwm == null)
{
pending_reads.RemoveAt(0);
continue;
}
if (rwm.completed.IsSet)
{
pending_reads.RemoveAt(0);
continue;
}
if (read_buffer.Count > 0)
{
int count_read = 0;
if (pending_reads[0].Type == vfsMessageTypes.READ)
{
while ((read_buffer.Count > 0) && (count_read < rwm.count))
{
rwm.buf[rwm.buf_offset + count_read] = read_buffer[0];
read_buffer.RemoveAt(0);
count_read++;
}
}
else
{
count_read = read_buffer.Count;
if (rwm.count < count_read)
{
count_read = rwm.count;
}
}
rwm.count_read = count_read;
rwm.completed.Set();
pending_reads.RemoveAt(0);
continue;
}
else
{
break;
}
}
}
}
public int Read(byte[] dest, int dest_offset, int count)
{
vfsMessageTypes.ReadWriteMessage rwm = new vfsMessageTypes.ReadWriteMessage();
rwm.buf = dest;
rwm.buf_offset = dest_offset;
rwm.count = count;
tysos.Syscalls.IPCFunctions.SendMessage(GetConsoleProcess(), new tysos.IPCMessage {
Type = vfsMessageTypes.READ, Message = rwm
});
tysos.Syscalls.SchedulerFunctions.Block(rwm.completed);
tysos.Syscalls.DebugFunctions.DebugWrite("Console: Read: returning " + rwm.count_read.ToString() + "\n");
return(rwm.count_read);
}
public void Write(byte[] src, int src_offset, int count)
{
vfsMessageTypes.ReadWriteMessage rwm = new vfsMessageTypes.ReadWriteMessage();
rwm.buf = new byte[count];
for (int i = 0; i < count; i++)
{
rwm.buf[i] = src[i + src_offset];
}
rwm.buf_offset = 0;
rwm.count = count;
tysos.Syscalls.IPCFunctions.SendMessage(GetConsoleProcess(), new tysos.IPCMessage {
Type = vfsMessageTypes.WRITE, Message = rwm
});
}
private void handle_message(tysos.IPCMessage msg)
{
switch (msg.Type)
{
case vfsMessageTypes.READ:
{
vfsMessageTypes.ReadWriteMessage rwm = msg.Message as vfsMessageTypes.ReadWriteMessage;
if (rwm != null)
{
if (read_buffer.Count > 0)
{
int count_read = 0;
while ((read_buffer.Count > 0) && (count_read < rwm.count))
{
rwm.buf[rwm.buf_offset + count_read] = read_buffer[0];
read_buffer.RemoveAt(0);
count_read++;
}
rwm.count_read = count_read;
rwm.completed.Set();
}
else
{
pending_reads.Add(msg);
}
}
}
break;
case vfsMessageTypes.WRITE:
{
vfsMessageTypes.ReadWriteMessage rwm = msg.Message as vfsMessageTypes.ReadWriteMessage;
if (rwm != null)
{
_Write(rwm.buf, rwm.buf_offset, rwm.count);
}
}
break;
case vfsMessageTypes.PEEK:
{
vfsMessageTypes.ReadWriteMessage rwm = msg.Message as vfsMessageTypes.ReadWriteMessage;
if (rwm != null)
{
//lock (rwm.completed)
{
if (read_buffer.Count >= rwm.count)
{
rwm.count_read = rwm.count;
rwm.completed.Set();
}
else
{
pending_reads.Add(msg);
}
}
}
}
break;
case GuiMessageTypes.KEYPRESS_MESSAGE:
{
GuiMessageTypes.KeyPressMessage kpm = msg.Message as GuiMessageTypes.KeyPressMessage;
if (kpm != null)
{
read_buffer.Add((byte)kpm.key);
process_pending_reads();
}
}
break;
}
}
