internal void Update()
{
// Clear out any processes which have ended.
_trackedProcesses = _trackedProcesses.Where(tp => !tp.HasExited).ToList();
// CAUTION: This code is subject to a race condition where between one
// call to update and the next, all the processes in the list ended, but new
// processes (which we are not yet tracking) were created. In that case,
// _trackedProcesses would now be empty, and the ProcessWatchdog would exit,
// even though there are still processes we care about.
//
// This should not happen for the scenarios we care about, since the parent
// process should outlive all its descendants.
if (_trackedProcesses.Any())
{
// Add any new descendants of the remaining processes (that is, any
// descendants that we're not already tracking).
UniqueProcess[] existingProcesses = _trackedProcesses.Select(tp => tp.Process).ToArray();
foreach (Process descendant in GetDescendants(_parentProcess.Id))
{
UniqueProcess uniqueDescendant;
if (UniqueProcess.TryCreate(descendant, out uniqueDescendant))
{
if (!existingProcesses.Contains(uniqueDescendant))
{
TrackProcess(descendant);
}
}
}
}
}
internal static bool TryCreate(
Process process,
Process procDumpProcess,
string description,
out TrackedProcess trackedProcess)
{
bool result = false;
trackedProcess = null;
if (UniqueProcess.TryCreate(process, out var uniqueProcess) &&
UniqueProcess.TryCreate(procDumpProcess, out var uniqueProcDumpProcess))
{
trackedProcess = new TrackedProcess(uniqueProcess, uniqueProcDumpProcess, description);
result = true;
}
return(result);
}
/// <summary>
/// Initializes a new instance of the <see cref="TrackedProcess"/> class from
/// the specified process information.
/// </summary>
/// <param name="process">
/// The process being tracked.
/// </param>
/// <param name="procDumpProcess">
/// The procdump process attached to <paramref name="process"/>, and responsible
/// for producing a memory dump if that process should fail.
/// </param>
/// <param name="description">
/// A string that describes the process, of the form "processName-processId".
/// </param>
private TrackedProcess(UniqueProcess process, UniqueProcess procDumpProcess, string description)
{
Process = process;
ProcDumpProcess = procDumpProcess;
Description = description;
}
