1 files changed, 67 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/preempt-sig.c b/REORG.TODO/hurd/preempt-sig.c
new file mode 100644
index 0000000000..81c4e905b4
--- /dev/null
+++ b/REORG.TODO/hurd/preempt-sig.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 1994-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <hurd/sigpreempt.h>
+#include <hurd/signal.h>
+#include <assert.h>
+
+void
+hurd_preempt_signals (struct hurd_signal_preemptor *preemptor)
+{
+  __mutex_lock (&_hurd_siglock);
+  preemptor->next = _hurdsig_preemptors;
+  _hurdsig_preemptors = preemptor;
+  _hurdsig_preempted_set |= preemptor->signals;
+  __mutex_unlock (&_hurd_siglock);
+}
+
+void
+hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor)
+{
+  struct hurd_signal_preemptor **p;
+  sigset_t preempted = 0;
+
+  __mutex_lock (&_hurd_siglock);
+
+  p = &_hurdsig_preemptors;
+  while (*p)
+    if (*p == preemptor)
+      {
+	/* Found it; take it off the chain.  */
+	*p = (*p)->next;
+	if ((preemptor->signals & preempted) != preemptor->signals)
+	  {
+	    /* This might have been the only preemptor for some
+	       of those signals, so we must collect the full mask
+	       from the others.  */
+	    struct hurd_signal_preemptor *pp;
+	    for (pp = *p; pp; pp = pp->next)
+	      preempted |= pp->signals;
+	    _hurdsig_preempted_set = preempted;
+	  }
+	__mutex_unlock (&_hurd_siglock);
+	return;
+      }
+    else
+      {
+	preempted |= (*p)->signals;
+	p = &(*p)->next;
+      }
+
+  __mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle.  */
+  assert (! "removing absent preemptor");
+}