1 /* Copyright (C) 1994-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
18 #include <hurd/sigpreempt.h>
19 #include <hurd/signal.h>
23 hurd_preempt_signals (struct hurd_signal_preemptor *preemptor)
25 __mutex_lock (&_hurd_siglock);
26 preemptor->next = _hurdsig_preemptors;
27 _hurdsig_preemptors = preemptor;
28 _hurdsig_preempted_set |= preemptor->signals;
29 __mutex_unlock (&_hurd_siglock);
33 hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor)
35 struct hurd_signal_preemptor **p;
36 sigset_t preempted = 0;
38 __mutex_lock (&_hurd_siglock);
40 p = &_hurdsig_preemptors;
44 /* Found it; take it off the chain. */
46 if ((preemptor->signals & preempted) != preemptor->signals)
48 /* This might have been the only preemptor for some
49 of those signals, so we must collect the full mask
51 struct hurd_signal_preemptor *pp;
52 for (pp = *p; pp; pp = pp->next)
53 preempted |= pp->signals;
54 _hurdsig_preempted_set = preempted;
56 __mutex_unlock (&_hurd_siglock);
61 preempted |= (*p)->signals;
65 __mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle. */
66 assert (! "removing absent preemptor");