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b168057a | 1 | /* Copyright (C) 1994-2015 Free Software Foundation, Inc. |
10dc2a90 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
10dc2a90 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
10dc2a90 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
71733723 | 18 | #include <hurd/sigpreempt.h> |
28f540f4 | 19 | #include <hurd/signal.h> |
71733723 | 20 | #include <assert.h> |
28f540f4 | 21 | |
71733723 | 22 | void |
10dc2a90 | 23 | hurd_preempt_signals (struct hurd_signal_preemptor *preemptor) |
28f540f4 | 24 | { |
71733723 | 25 | __mutex_lock (&_hurd_siglock); |
10dc2a90 UD |
26 | preemptor->next = _hurdsig_preemptors; |
27 | _hurdsig_preemptors = preemptor; | |
28 | _hurdsig_preempted_set |= preemptor->signals; | |
71733723 | 29 | __mutex_unlock (&_hurd_siglock); |
28f540f4 RM |
30 | } |
31 | ||
71733723 | 32 | void |
10dc2a90 | 33 | hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor) |
28f540f4 | 34 | { |
10dc2a90 | 35 | struct hurd_signal_preemptor **p; |
71733723 RM |
36 | sigset_t preempted = 0; |
37 | ||
38 | __mutex_lock (&_hurd_siglock); | |
39 | ||
10dc2a90 | 40 | p = &_hurdsig_preemptors; |
71733723 | 41 | while (*p) |
10dc2a90 | 42 | if (*p == preemptor) |
28f540f4 | 43 | { |
71733723 RM |
44 | /* Found it; take it off the chain. */ |
45 | *p = (*p)->next; | |
10dc2a90 | 46 | if ((preemptor->signals & preempted) != preemptor->signals) |
71733723 | 47 | { |
10dc2a90 | 48 | /* This might have been the only preemptor for some |
71733723 RM |
49 | of those signals, so we must collect the full mask |
50 | from the others. */ | |
10dc2a90 | 51 | struct hurd_signal_preemptor *pp; |
71733723 RM |
52 | for (pp = *p; pp; pp = pp->next) |
53 | preempted |= pp->signals; | |
54 | _hurdsig_preempted_set = preempted; | |
55 | } | |
56 | __mutex_unlock (&_hurd_siglock); | |
57 | return; | |
28f540f4 | 58 | } |
71733723 RM |
59 | else |
60 | { | |
61 | preempted |= (*p)->signals; | |
62 | p = &(*p)->next; | |
63 | } | |
64 | ||
65 | __mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle. */ | |
10dc2a90 | 66 | assert (! "removing absent preemptor"); |
28f540f4 | 67 | } |