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locking.h

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+/*
+ * Copyright 2008-2013 Various Authors
+ * Copyright 2004 Timo Hirvonen
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CMUS_LOCKING_H
+#define CMUS_LOCKING_H
+
+#include <pthread.h>
+#include <stdatomic.h>
+
+struct fifo_mutex {
+	struct fifo_waiter * _Atomic tail;
+	struct fifo_waiter *head;
+	pthread_mutex_t mutex;
+};
+
+extern pthread_t main_thread;
+
+#define CMUS_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
+#define CMUS_COND_INITIALIZER PTHREAD_COND_INITIALIZER
+#define CMUS_RWLOCK_INITIALIZER PTHREAD_RWLOCK_INITIALIZER
+
+#define FIFO_MUTEX_INITIALIZER { \
+		.mutex = PTHREAD_MUTEX_INITIALIZER, \
+		.tail = ATOMIC_VAR_INIT(NULL), \
+	}
+
+void cmus_mutex_lock(pthread_mutex_t *mutex);
+void cmus_mutex_unlock(pthread_mutex_t *mutex);
+void cmus_rwlock_rdlock(pthread_rwlock_t *lock);
+void cmus_rwlock_wrlock(pthread_rwlock_t *lock);
+void cmus_rwlock_unlock(pthread_rwlock_t *lock);
+
+void fifo_mutex_lock(struct fifo_mutex *fifo);
+void fifo_mutex_unlock(struct fifo_mutex *fifo);
+void fifo_mutex_yield(struct fifo_mutex *fifo);
+
+#endif