[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/hurd/preempt-sig.c b/ap/libc/glibc/glibc-2.23/hurd/preempt-sig.c
new file mode 100644
index 0000000..bece0f2
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/hurd/preempt-sig.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 1994-2016 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");
+}