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a67c21f093
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1971 fefdeb5f-60dc-0310-8127-8f9354f1896f
133 lines
3 KiB
C
133 lines
3 KiB
C
/* $Id$ */
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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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 PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <signal.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/flist.h>
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#include <pulsecore/once.h>
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#include <pulsecore/thread.h>
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#include <pulsecore/core-util.h>
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#include "rtsig.h"
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#ifdef SIGRTMIN
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static void _free_rtsig(void *p) {
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pa_rtsig_put(PA_PTR_TO_INT(p));
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}
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PA_STATIC_FLIST_DECLARE(rtsig_flist, pa_make_power_of_two(SIGRTMAX-SIGRTMIN+1), NULL);
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PA_STATIC_TLS_DECLARE(rtsig_tls, _free_rtsig);
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static pa_atomic_t rtsig_current = PA_ATOMIC_INIT(-1);
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static int rtsig_start = -1, rtsig_end = -1;
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int pa_rtsig_get(void) {
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void *p;
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int sig;
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if ((p = pa_flist_pop(PA_STATIC_FLIST_GET(rtsig_flist))))
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return PA_PTR_TO_INT(p);
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sig = pa_atomic_dec(&rtsig_current);
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pa_assert(sig <= SIGRTMAX);
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pa_assert(sig <= rtsig_end);
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if (sig < rtsig_start) {
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pa_atomic_inc(&rtsig_current);
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return -1;
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}
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return sig;
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}
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int pa_rtsig_get_for_thread(void) {
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int sig;
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void *p;
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if ((p = PA_STATIC_TLS_GET(rtsig_tls)))
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return PA_PTR_TO_INT(p);
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if ((sig = pa_rtsig_get()) < 0)
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return -1;
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PA_STATIC_TLS_SET(rtsig_tls, PA_INT_TO_PTR(sig));
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return sig;
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}
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void pa_rtsig_put(int sig) {
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pa_assert(sig >= rtsig_start);
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pa_assert(sig <= rtsig_end);
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pa_assert_se(pa_flist_push(PA_STATIC_FLIST_GET(rtsig_flist), PA_INT_TO_PTR(sig)) >= 0);
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}
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void pa_rtsig_configure(int start, int end) {
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int s;
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sigset_t ss;
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pa_assert(pa_atomic_load(&rtsig_current) == -1);
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pa_assert(SIGRTMIN <= start);
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pa_assert(start <= end);
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pa_assert(end <= SIGRTMAX);
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rtsig_start = start;
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rtsig_end = end;
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sigemptyset(&ss);
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for (s = rtsig_start; s <= rtsig_end; s++)
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pa_assert_se(sigaddset(&ss, s) == 0);
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pa_assert(pthread_sigmask(SIG_BLOCK, &ss, NULL) == 0);
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/* We allocate starting from the end */
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pa_atomic_store(&rtsig_current, rtsig_end);
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}
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#else /* SIGRTMIN */
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int pa_rtsig_get(void) {
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return -1;
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}
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int pa_rtsig_get_for_thread(void) {
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return -1;
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}
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void pa_rtsig_put(int sig) {
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}
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void pa_rtsig_configure(int start, int end) {
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}
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#endif /* SIGRTMIN */
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