void ComputeThreadFunc(object thread_data)
{
thread_timestamp data = thread_data as thread_timestamp;
try {
T result = ResultSource.ExtractResult();
lock (compute_thread_lock) {
computed_result = result;
computing = false;
}
} catch (Exception e) {
background_exception = e;
computing = false;
last_exception_timestamp = data.timestamp;
}
}
void spawn_recompute()
{
Thread computer = null;
lock (compute_thread_lock) {
if (computing == false)
{
computing = true;
active_thread_data = new thread_timestamp()
{
timestamp = this.result_timestamp
};
ActiveComputeExceptions = new List <ModelingOpException>(); // maybe should go in active_thread_data ?
computer = new Thread(ComputeThreadFunc);
}
}
if (computer != null)
{
computer.Start(active_thread_data);
}
}
public OpResultOutputStatus <T> CheckForNewResult()
{
if (computing)
{
return(OpResultOutputStatus <T> .Computing());
}
else if (result_valid)
{
return(OpResultOutputStatus <T> .Unavailable());
}
else if (last_exception_timestamp == result_timestamp)
{
return(OpResultOutputStatus <T> .Unavailable());
}
else
{
// the compute we were waiting for has finished, extract the resulting mesh
T returnResult = default(T);
bool spawn_new_compute = false;
lock (compute_thread_lock) {
returnResult = computed_result;
computed_result = default(T);
// situations where we will discard this result:
// 1) it came back null. lets hope this is temporary...
// 2) active_thread_data was null. This means we hadn't actually spawned
// the compute thread yet. [TODO] maybe this should happen another way?
// 3) the timestamp increment since we spawned the current comput thread.
// Discard the result and spawn a new compute.
bool use_result = (returnResult != null) &&
(active_thread_data != null) &&
(active_thread_data.timestamp == result_timestamp);
if (use_result)
{
result_valid = true;
}
else
{
result_valid = false;
spawn_new_compute = true;
}
active_thread_data = null;
LastComputeExceptions = ActiveComputeExceptions;
ActiveComputeExceptions = null;
}
if (spawn_new_compute)
{
spawn_recompute();
}
if (returnResult == null)
{
return((computing) ? OpResultOutputStatus <T> .Computing() : OpResultOutputStatus <T> .Unavailable());
}
else
{
return(OpResultOutputStatus <T> .Ready(returnResult, LastComputeExceptions));
}
}
}
