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diff --git a/src/pulsecore/asyncmsgq.h b/src/pulsecore/asyncmsgq.h
new file mode 100644
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+++ b/src/pulsecore/asyncmsgq.h
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+#ifndef foopulseasyncmsgqhfoo
+#define foopulseasyncmsgqhfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+
+#include <pulsecore/asyncq.h>
+#include <pulsecore/memchunk.h>
+#include <pulsecore/msgobject.h>
+
+/* A simple asynchronous message queue, based on pa_asyncq. In
+ * contrast to pa_asyncq this one is multiple-writer safe, though
+ * still not multiple-reader safe. This queue is intended to be used
+ * for controlling real-time threads from normal-priority
+ * threads. Multiple-writer-safety is accomplished by using a mutex on
+ * the writer side. This queue is thus not useful for communication
+ * between several real-time threads.
+ *
+ * The queue takes messages consisting of:
+ *    "Object" for which this messages is intended (may be NULL)
+ *    A numeric message code
+ *    Arbitrary userdata pointer (may be NULL)
+ *    A memchunk (may be NULL)
+ *
+ * There are two functions for submitting messages: _post and
+ * _send. The former just enqueues the message asynchronously, the
+ * latter waits for completion, synchronously. */
+
+enum {
+    PA_MESSAGE_SHUTDOWN = -1/* A generic message to inform the handler of this queue to quit */
+};
+
+typedef struct pa_asyncmsgq pa_asyncmsgq;
+
+pa_asyncmsgq* pa_asyncmsgq_new(unsigned size);
+pa_asyncmsgq* pa_asyncmsgq_ref(pa_asyncmsgq *q);
+
+void pa_asyncmsgq_unref(pa_asyncmsgq* q);
+
+void pa_asyncmsgq_post(pa_asyncmsgq *q, pa_msgobject *object, int code, const void *userdata, int64_t offset, const pa_memchunk *memchunk, pa_free_cb_t userdata_free_cb);
+int pa_asyncmsgq_send(pa_asyncmsgq *q, pa_msgobject *object, int code, const void *userdata, int64_t offset, const pa_memchunk *memchunk);
+
+int pa_asyncmsgq_get(pa_asyncmsgq *q, pa_msgobject **object, int *code, void **userdata, int64_t *offset, pa_memchunk *memchunk, bool wait);
+int pa_asyncmsgq_dispatch(pa_msgobject *object, int code, void *userdata, int64_t offset, pa_memchunk *memchunk);
+void pa_asyncmsgq_done(pa_asyncmsgq *q, int ret);
+int pa_asyncmsgq_wait_for(pa_asyncmsgq *a, int code);
+int pa_asyncmsgq_process_one(pa_asyncmsgq *a);
+
+void pa_asyncmsgq_flush(pa_asyncmsgq *a, bool run);
+
+/* For the reading side */
+int pa_asyncmsgq_read_fd(pa_asyncmsgq *q);
+int pa_asyncmsgq_read_before_poll(pa_asyncmsgq *a);
+void pa_asyncmsgq_read_after_poll(pa_asyncmsgq *a);
+
+/* For the write side */
+int pa_asyncmsgq_write_fd(pa_asyncmsgq *q);
+void pa_asyncmsgq_write_before_poll(pa_asyncmsgq *a);
+void pa_asyncmsgq_write_after_poll(pa_asyncmsgq *a);
+
+bool pa_asyncmsgq_dispatching(pa_asyncmsgq *a);
+
+#endif