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71733723 | 1 | /* Copyright (C) 1994, 1995, 1996 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 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
28f540f4 | 18 | |
71733723 | 19 | #include <hurd/sigpreempt.h> |
28f540f4 | 20 | #include <hurd/signal.h> |
71733723 | 21 | #include <assert.h> |
28f540f4 | 22 | |
71733723 | 23 | void |
10dc2a90 | 24 | hurd_preempt_signals (struct hurd_signal_preemptor *preemptor) |
28f540f4 | 25 | { |
71733723 | 26 | __mutex_lock (&_hurd_siglock); |
10dc2a90 UD |
27 | preemptor->next = _hurdsig_preemptors; |
28 | _hurdsig_preemptors = preemptor; | |
29 | _hurdsig_preempted_set |= preemptor->signals; | |
71733723 | 30 | __mutex_unlock (&_hurd_siglock); |
28f540f4 RM |
31 | } |
32 | ||
71733723 | 33 | void |
10dc2a90 | 34 | hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor) |
28f540f4 | 35 | { |
10dc2a90 | 36 | struct hurd_signal_preemptor **p; |
71733723 RM |
37 | sigset_t preempted = 0; |
38 | ||
39 | __mutex_lock (&_hurd_siglock); | |
40 | ||
10dc2a90 | 41 | p = &_hurdsig_preemptors; |
71733723 | 42 | while (*p) |
10dc2a90 | 43 | if (*p == preemptor) |
28f540f4 | 44 | { |
71733723 RM |
45 | /* Found it; take it off the chain. */ |
46 | *p = (*p)->next; | |
10dc2a90 | 47 | if ((preemptor->signals & preempted) != preemptor->signals) |
71733723 | 48 | { |
10dc2a90 | 49 | /* This might have been the only preemptor for some |
71733723 RM |
50 | of those signals, so we must collect the full mask |
51 | from the others. */ | |
10dc2a90 | 52 | struct hurd_signal_preemptor *pp; |
71733723 RM |
53 | for (pp = *p; pp; pp = pp->next) |
54 | preempted |= pp->signals; | |
55 | _hurdsig_preempted_set = preempted; | |
56 | } | |
57 | __mutex_unlock (&_hurd_siglock); | |
58 | return; | |
28f540f4 | 59 | } |
71733723 RM |
60 | else |
61 | { | |
62 | preempted |= (*p)->signals; | |
63 | p = &(*p)->next; | |
64 | } | |
65 | ||
66 | __mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle. */ | |
10dc2a90 | 67 | assert (! "removing absent preemptor"); |
28f540f4 | 68 | } |