68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Copyright (C) 1994-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <hurd/sigpreempt.h>
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#include <hurd/signal.h>
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#include <assert.h>
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void
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hurd_preempt_signals (struct hurd_signal_preemptor *preemptor)
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{
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__mutex_lock (&_hurd_siglock);
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preemptor->next = _hurdsig_preemptors;
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_hurdsig_preemptors = preemptor;
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_hurdsig_preempted_set |= preemptor->signals;
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__mutex_unlock (&_hurd_siglock);
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}
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void
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hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor)
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{
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struct hurd_signal_preemptor **p;
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sigset_t preempted = 0;
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__mutex_lock (&_hurd_siglock);
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p = &_hurdsig_preemptors;
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while (*p)
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if (*p == preemptor)
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{
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/* Found it; take it off the chain. */
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*p = (*p)->next;
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if ((preemptor->signals & preempted) != preemptor->signals)
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{
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/* This might have been the only preemptor for some
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of those signals, so we must collect the full mask
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from the others. */
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struct hurd_signal_preemptor *pp;
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for (pp = *p; pp; pp = pp->next)
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preempted |= pp->signals;
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_hurdsig_preempted_set = preempted;
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}
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__mutex_unlock (&_hurd_siglock);
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return;
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}
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else
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{
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preempted |= (*p)->signals;
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p = &(*p)->next;
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}
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__mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle. */
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assert (! "removing absent preemptor");
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}
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