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/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <errno.h>
#include <pulsecore/atomic.h>
#include <pulsecore/log.h>
#include <pulsecore/thread.h>
#include <pulsecore/semaphore.h>
#include <pulsecore/macro.h>
#include <pulsecore/core-util.h>
#include <pulsecore/flist.h>
#include <pulse/xmalloc.h>
#include "asyncmsgq.h"
PA_STATIC_FLIST_DECLARE(asyncmsgq, 0);
struct asyncmsgq_item {
int code;
pa_msgobject *object;
void *userdata;
pa_free_cb_t free_cb;
pa_memchunk memchunk;
pa_semaphore *semaphore;
};
struct pa_asyncmsgq {
pa_asyncq *asyncq;
pa_mutex *mutex; /* only for the writer side */
struct asyncmsgq_item *current;
};
pa_asyncmsgq *pa_asyncmsgq_new(unsigned size) {
pa_asyncmsgq *a;
a = pa_xnew(pa_asyncmsgq, 1);
pa_assert_se(a->asyncq = pa_asyncq_new(size));
pa_assert_se(a->mutex = pa_mutex_new(0));
a->current = NULL;
return a;
}
void pa_asyncmsgq_free(pa_asyncmsgq *a) {
struct asyncmsgq_item *i;
pa_assert(a);
while ((i = pa_asyncq_pop(a->asyncq, 0))) {
pa_assert(!i->semaphore);
if (i->object)
pa_msgobject_unref(i->object);
if (i->memchunk.memblock)
pa_memblock_unref(i->object);
if (i->userdata_free_cb)
i->userdata_free_cb(i->userdata);
if (pa_flist_push(PA_STATIC_FLIST_GET(asyncmsgq), i) < 0)
pa_xfree(i);
}
pa_asyncq_free(a->asyncq, NULL);
pa_mutex_free(a->mutex);
pa_xfree(a);
}
void pa_asyncmsgq_post(pa_asyncmsgq *a, pa_msgobject *object, int code, const void *userdata, const pa_memchunk *chunk, pa_free_cb_t free_cb) {
struct asyncmsgq_item *i;
pa_assert(a);
if (!(i = pa_flist_pop(PA_STATIC_FLIST_GET(asyncmsgq))))
i = pa_xnew(struct asyncmsgq_item, 1);
i->code = code;
i->object = pa_msgobject_ref(object);
i->userdata = (void*) userdata;
i->free_cb = free_cb;
if (chunk) {
pa_assert(chunk->memblock);
i->memchunk = *chunk;
pa_memblock_ref(i->memchunk.memblock);
} else
pa_memchunk_reset(&i->memchunk);
i->semaphore = NULL;
/* Thus mutex makes the queue multiple-writer safe. This lock is only used on the writing side */
pa_mutex_lock(a->mutex);
pa_assert_se(pa_asyncq_push(a->asyncq, i, 1) == 0);
pa_mutex_unlock(a->mutex);
}
int pa_asyncmsgq_send(pa_asyncmsgq *a, pa_msgobject *object, int code, const void *userdata, const pa_memchunk *chunk) {
struct asyncmsgq_item i;
pa_assert(a);
i.code = code;
i.object = object;
i.userdata = (void*) userdata;
i.free_cb = NULL;
i.ret = -1;
if (chunk) {
pa_assert(chunk->memblock);
i->memchunk = *chunk;
} else
pa_memchunk_reset(&i->memchunk);
pa_assert_se(i.semaphore = pa_semaphore_new(0));
/* Thus mutex makes the queue multiple-writer safe. This lock is only used on the writing side */
pa_mutex_lock(a->mutex);
pa_assert_se(pa_asyncq_push(a->asyncq, &i, 1) == 0);
pa_mutex_unlock(a->mutex);
pa_semaphore_wait(i.semaphore);
pa_semaphore_free(i.semaphore);
return i.ret;
}
int pa_asyncmsgq_get(pa_asyncmsgq *a, pa_msgobject **object, int *code, void **userdata, pa_memchunk *chunk, int wait) {
pa_assert(a);
pa_assert(code);
pa_assert(!a->current);
if (!(a->current = pa_asyncq_pop(a->asyncq, wait)))
return -1;
*code = a->current->code;
if (userdata)
*userdata = a->current->userdata;
if (object)
*object = a->current->object;
if (chunk)
*chunk = a->chunk;
return 0;
}
void pa_asyncmsgq_done(pa_asyncmsgq *a, int ret) {
pa_assert(a);
pa_assert(a->current);
if (a->current->semaphore) {
a->current->ret = ret;
pa_semaphore_post(a->current->semaphore);
} else {
if (a->current->free_cb)
a->current->free_cb(a->current->userdata);
if (a->current->object)
pa_msgobject_unref(a->current->object);
if (a->current->memchunk.memblock)
pa_memblock_unref(a->current->memchunk.memblock);
if (pa_flist_push(PA_STATIC_FLIST_GET(asyncmsgq), a->current) < 0)
pa_xfree(a->current);
}
a->current = NULL;
}
int pa_asyncmsgq_wait_for(pa_asyncmsgq *a, int code) {
int c;
pa_assert(a);
do {
if (pa_asyncmsgq_get(a, NULL, &c, NULL, 1) < 0)
return -1;
pa_asyncmsgq_done(a);
} while (c != code);
return 0;
}
int pa_asyncmsgq_get_fd(pa_asyncmsgq *a) {
pa_assert(a);
return pa_asyncq_get_fd(a->asyncq);
}
int pa_asyncmsgq_before_poll(pa_asyncmsgq *a) {
pa_assert(a);
return pa_asyncq_before_poll(a->asyncq);
}
void pa_asyncmsgq_after_poll(pa_asyncmsgq *a) {
pa_assert(a);
pa_asyncq_after_poll(a->asyncq);
}
int pa_asyncmsgq_dispatch(pa_msgobject *object, int code, void *userdata, pa_memchunk *memchunk) {
pa_assert(q);
if (object)
return object->msg_process(object, code, userdata, memchunk);
return 0;
}
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