/// <summary>
/// Initializes a new instance of the <see cref="RevertRelevance"/> struct.
/// </summary>
/// <param name="pump">The instance that created this value.</param>
internal RevertRelevance(JoinableTaskContext pump)
{
Requires.NotNull(pump, nameof(pump));
this.pump = pump;
this.oldJoinable = pump.AmbientTask;
pump.AmbientTask = null;
var jobSyncContext = SynchronizationContext.Current as JoinableTaskSynchronizationContext;
if (jobSyncContext != null)
{
SynchronizationContext appliedSyncContext = null;
if (jobSyncContext.MainThreadAffinitized)
{
appliedSyncContext = pump.UnderlyingSynchronizationContext;
}
this.temporarySyncContext = appliedSyncContext.Apply(); // Apply() extension method allows null receiver
}
else
{
this.temporarySyncContext = default(SpecializedSyncContext);
}
}