123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 Warren Dukes <warren.dukes@gmail.com>
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* Copyright (C) 2008 Eric Wong <normalperson@yhbt.net>
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*
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "main_notify.h"
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#include "notify.h"
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#include "utils.h"
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#include "ioops.h"
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#include "gcc.h"
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#include "log.h"
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static struct ioOps main_notify_IO;
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static int main_pipe[2];
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static pthread_t main_task;
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static Notify main_notify;
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static pthread_mutex_t select_mutex = PTHREAD_MUTEX_INITIALIZER;
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static int ioops_fdset(fd_set * rfds,
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mpd_unused fd_set * wfds, mpd_unused fd_set * efds)
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{
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FD_SET(main_pipe[0], rfds);
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return main_pipe[0];
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}
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static void consume_pipe(void)
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{
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char buffer[2];
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ssize_t r = read(main_pipe[0], buffer, sizeof(buffer));
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if (r < 0 && errno != EAGAIN && errno != EINTR)
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FATAL("error reading from pipe: %s\n", strerror(errno));
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}
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static int ioops_consume(int fd_count, fd_set * rfds,
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mpd_unused fd_set * wfds, mpd_unused fd_set * efds)
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{
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if (FD_ISSET(main_pipe[0], rfds)) {
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consume_pipe();
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FD_CLR(main_pipe[0], rfds);
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fd_count--;
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}
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return fd_count;
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}
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void init_main_notify(void)
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{
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init_async_pipe(main_pipe);
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main_notify_IO.fdset = ioops_fdset;
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main_notify_IO.consume = ioops_consume;
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registerIO(&main_notify_IO);
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main_task = pthread_self();
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notify_init(&main_notify);
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}
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void deinit_main_notify(void)
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{
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notify_deinit(&main_notify);
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deregisterIO(&main_notify_IO);
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xclose(main_pipe[0]);
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xclose(main_pipe[1]);
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}
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static int wakeup_via_pipe(void)
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{
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int ret = pthread_mutex_trylock(&select_mutex);
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if (ret == EBUSY) {
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ssize_t w = write(main_pipe[1], "", 1);
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if (w < 0 && errno != EAGAIN && errno != EINTR)
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FATAL("error writing to pipe: %s\n",
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strerror(errno));
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return 1;
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} else {
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pthread_mutex_unlock(&select_mutex);
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return 0;
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}
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}
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void wakeup_main_task(void)
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{
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main_notify.pending = 1;
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if (!wakeup_via_pipe())
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notify_signal(&main_notify);
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}
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void main_notify_lock(void)
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{
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assert(pthread_equal(main_task, pthread_self()));
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pthread_mutex_lock(&select_mutex);
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}
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void main_notify_unlock(void)
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{
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assert(pthread_equal(main_task, pthread_self()));
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pthread_mutex_unlock(&select_mutex);
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}
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void wait_main_task(void)
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{
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assert(pthread_equal(main_task, pthread_self()));
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notify_enter(&main_notify);
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notify_wait(&main_notify);
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notify_leave(&main_notify);
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}
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