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/***
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
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/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulse/xmalloc.h>
#include <pulsecore/macro.h>
#include <pulsecore/flist.h>
#include <pulse/fork-detect.h>
#include "internal.h"
#include "operation.h"
PA_STATIC_FLIST_DECLARE(operations, 0, pa_xfree);
pa_operation *pa_operation_new(pa_context *c, pa_stream *s, pa_operation_cb_t cb, void *userdata) {
pa_operation *o;
pa_assert(c);
if (!(o = pa_flist_pop(PA_STATIC_FLIST_GET(operations))))
o = pa_xnew(pa_operation, 1);
pa_zero(*o);
PA_REFCNT_INIT(o);
o->context = c;
o->stream = s;
o->state = PA_OPERATION_RUNNING;
o->callback = cb;
o->userdata = userdata;
/* Refcounting is strictly one-way: from the "bigger" to the "smaller" object. */
PA_LLIST_PREPEND(pa_operation, c->operations, o);
pa_operation_ref(o);
return o;
}
pa_operation *pa_operation_ref(pa_operation *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
PA_REFCNT_INC(o);
return o;
}
void pa_operation_unref(pa_operation *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
if (PA_REFCNT_DEC(o) <= 0) {
pa_assert(!o->context);
pa_assert(!o->stream);
if (pa_flist_push(PA_STATIC_FLIST_GET(operations), o) < 0)
pa_xfree(o);
}
}
static void operation_unlink(pa_operation *o) {
pa_assert(o);
if (o->context) {
pa_assert(PA_REFCNT_VALUE(o) >= 2);
PA_LLIST_REMOVE(pa_operation, o->context->operations, o);
pa_operation_unref(o);
o->context = NULL;
}
o->stream = NULL;
o->callback = NULL;
o->userdata = NULL;
o->state_callback = NULL;
o->state_userdata = NULL;
}
static void operation_set_state(pa_operation *o, pa_operation_state_t st) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
if (st == o->state)
return;
if ((o->state == PA_OPERATION_DONE) || (o->state == PA_OPERATION_CANCELED))
return;
pa_operation_ref(o);
o->state = st;
if (o->state_callback)
o->state_callback(o, o->state_userdata);
if ((o->state == PA_OPERATION_DONE) || (o->state == PA_OPERATION_CANCELED))
operation_unlink(o);
pa_operation_unref(o);
}
void pa_operation_cancel(pa_operation *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
operation_set_state(o, PA_OPERATION_CANCELED);
}
void pa_operation_done(pa_operation *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
operation_set_state(o, PA_OPERATION_DONE);
}
pa_operation_state_t pa_operation_get_state(const pa_operation *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
return o->state;
}
void pa_operation_set_state_callback(pa_operation *o, pa_operation_notify_cb_t cb, void *userdata) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
if (pa_detect_fork())
return;
if (o->state == PA_OPERATION_DONE || o->state == PA_OPERATION_CANCELED)
return;
o->state_callback = cb;
o->state_userdata = userdata;
}
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