public void Dispose()
{
if (_state != null)
{
GC.SuppressFinalize(this);
_state.ReleaseRef();
_state = null !;
}
}
internal static void CheckChildren(bool reapAll)
{
// This is called on SIGCHLD from a native thread.
// A lock in Process ensures no new processes are spawned while we are checking.
lock (s_childProcessWaitStates)
{
bool checkAll = false;
// Check terminated processes.
int pid;
do
{
// Find a process that terminated without reaping it yet.
pid = Interop.Sys.WaitIdAnyExitedNoHangNoWait();
if (pid > 0)
{
if (s_childProcessWaitStates.TryGetValue(pid, out ProcessWaitState? pws))
{
// Known Process.
if (pws.TryReapChild())
{
pws.ReleaseRef();
}
}
else
{
// unlikely: This is not a managed Process, so we are not responsible for reaping.
// Fall back to checking all Processes.
checkAll = true;
break;
}
}
else if (pid == 0)
{
// No more terminated children.
}
else
{
// Unexpected.
int errorCode = Marshal.GetLastWin32Error();
Environment.FailFast("Error while checking for terminated children. errno = " + errorCode);
}
} while (pid > 0);
if (checkAll)
{
// We track things to unref so we don't invalidate our iterator by changing s_childProcessWaitStates.
ProcessWaitState? firstToRemove = null;
List <ProcessWaitState>?additionalToRemove = null;
foreach (KeyValuePair <int, ProcessWaitState> kv in s_childProcessWaitStates)
{
ProcessWaitState pws = kv.Value;
if (pws.TryReapChild())
{
if (firstToRemove == null)
{
firstToRemove = pws;
}
else
{
if (additionalToRemove == null)
{
additionalToRemove = new List <ProcessWaitState>();
}
additionalToRemove.Add(pws);
}
}
}
if (firstToRemove != null)
{
firstToRemove.ReleaseRef();
if (additionalToRemove != null)
{
foreach (ProcessWaitState pws in additionalToRemove)
{
pws.ReleaseRef();
}
}
}
}
if (reapAll)
{
do
{
int exitCode;
pid = Interop.Sys.WaitPidExitedNoHang(-1, out exitCode);
} while (pid > 0);
}
}
}
