public static async Task <ONIContextDisposable> ReserveContextAsync(ONIHardwareSlot slot, bool releaseWaiting = false, CancellationToken ct = default)
{
#if DEBUG
Console.WriteLine("Context async slot " + slot + " reserved by " + (new System.Diagnostics.StackTrace()).GetFrame(1).GetMethod().DeclaringType);
#endif
return(await Task.Run(() => ReserveContext(slot, releaseWaiting), ct));
}
/// <summary>
/// Reserve an ONI Context after it has already been opened by the appropriate call to
/// <see cref="ReserveContext(ONIHardwareSlot, bool)"/>
/// </summary>
/// <param name="slot">Hardware slot to reserve.</param>
/// <returns>Returns a <see cref="ONIContextDisposable"/> asynchronously after it has already been opened.</returns>
public static async Task <ONIContextDisposable> ReserveOpenContextAsync(ONIHardwareSlot slot)
{
#if DEBUG
Console.WriteLine("Open context async slot " + slot + " reserved by " + (new System.Diagnostics.StackTrace()).GetFrame(1).GetMethod().DeclaringType);
#endif
lock (openContextLock)
{
if (!contextWaitHandles.TryGetValue(slot.MakeKey(), out EventWaitHandle waitHandle))
{
contextWaitHandles.Add(slot.MakeKey(), new EventWaitHandle(false, EventResetMode.ManualReset));
}
}
return(await Task.Run(() =>
{
contextWaitHandles[slot.MakeKey()].WaitOne();
return ReserveContext(slot);
}));
}
public static ONIContextDisposable ReserveContext(ONIHardwareSlot slot, bool releaseWaiting = false, bool resetRunning = false)
{
var contextCounted = default(Tuple <ONIContextTask, RefCountDisposable>);
lock (openContextLock)
{
if (string.IsNullOrEmpty(slot.Driver))
{
contextCounted = openContexts.Count == 1
? openContexts.Values.Single()
: throw new ArgumentException("An ONI hardware slot must be specified.", nameof(slot));
}
if (!openContexts.TryGetValue(slot.MakeKey(), out contextCounted))
{
var configuration = LoadConfiguration();
if (configuration.Contains(slot.MakeKey()))
{
slot = configuration[slot.MakeKey()];
}
var ctx = new ONIContextTask(slot.Driver, slot.Index);
var dispose = Disposable.Create(() =>
{
ctx.Dispose();
contextWaitHandles[slot.MakeKey()].Reset();
// Context and wait handles are removed from dictionaries together
openContexts.Remove(slot.MakeKey());
contextWaitHandles.Remove(slot.MakeKey());
});
if (!contextWaitHandles.TryGetValue(slot.MakeKey(), out EventWaitHandle waitHandle))
{
contextWaitHandles.Add(slot.MakeKey(), new EventWaitHandle(false, EventResetMode.ManualReset));
}
if (releaseWaiting)
{
contextWaitHandles[slot.MakeKey()].Set();
}
var referenenceCount = new RefCountDisposable(dispose);
contextCounted = Tuple.Create(ctx, referenenceCount);
openContexts.Add(slot.MakeKey(), contextCounted);
return(new ONIContextDisposable(ctx, referenenceCount, openContextLock));
}
if (resetRunning)
{
contextCounted.Item1.Reset();
}
if (releaseWaiting)
{
// Will already be created if we in this portion of code.
contextWaitHandles[slot.MakeKey()].Set();
}
#if DEBUG
Console.WriteLine("Context slot " + slot + " reserved by " + new System.Diagnostics.StackTrace().GetFrame(1).GetMethod().DeclaringType);
#endif
return(new ONIContextDisposable(contextCounted.Item1, contextCounted.Item2.GetDisposable(), openContextLock));
}
}
