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/*
DeaDBeeF - ultimate music player for GNU/Linux systems with X11
Copyright (C) 2009-2011 Alexey Yakovenko <waker@users.sourceforge.net>
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/>.
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include "messagepump.h"
#include "threading.h"
#include "playlist.h"
typedef struct message_s {
uint32_t id;
uintptr_t ctx;
uint32_t p1;
uint32_t p2;
struct message_s *next;
} message_t;
enum { MAX_MESSAGES = 100 };
static message_t pool[MAX_MESSAGES];
static message_t *mfree;
static message_t *mqueue;
static message_t *mqtail;
static uintptr_t mutex;
static uintptr_t cond;
static void
messagepump_reset (void);
int
messagepump_init (void) {
messagepump_reset ();
mutex = mutex_create ();
cond = cond_create ();
return 0;
}
void
messagepump_free () {
mutex_lock (mutex);
messagepump_reset ();
mutex_unlock (mutex);
mutex_free (mutex);
cond_free (cond);
}
static void
messagepump_reset (void) {
mqueue = NULL;
mfree = NULL;
mqtail = NULL;
memset (pool, 0, sizeof (pool));
for (int i = 0; i < MAX_MESSAGES; i++) {
pool[i].next = mfree;
mfree = &pool[i];
}
}
int
messagepump_push (uint32_t id, uintptr_t ctx, uint32_t p1, uint32_t p2) {
if (!mfree) {
fprintf (stderr, "WARNING: message queue is full! message ignored (%d %p %d %d)\n", id, (void*)ctx, p1, p2);
if (id >= DB_EV_FIRST && ctx) {
messagepump_event_free ((ddb_event_t *)ctx);
}
return -1;
}
mutex_lock (mutex);
message_t *msg = mfree;
mfree = mfree->next;
if (mqtail) {
mqtail->next = msg;
}
mqtail = msg;
if (!mqueue) {
mqueue = msg;
}
msg->next = NULL;
msg->id = id;
msg->ctx = ctx;
msg->p1 = p1;
msg->p2 = p2;
mutex_unlock (mutex);
cond_signal (cond);
return 0;
}
void
messagepump_wait (void) {
cond_wait (cond, mutex);
mutex_unlock (mutex);
}
int
messagepump_pop (uint32_t *id, uintptr_t *ctx, uint32_t *p1, uint32_t *p2) {
mutex_lock (mutex);
if (!mqueue) {
mutex_unlock (mutex);
return -1;
}
*id = mqueue->id;
*ctx = mqueue->ctx;
*p1 = mqueue->p1;
*p2 = mqueue->p2;
message_t *next = mqueue->next;
mqueue->next = mfree;
mfree = mqueue;
mqueue = next;
if (!mqueue) {
mqtail = NULL;
}
mutex_unlock (mutex);
return 0;
}
int
messagepump_hasmessages (void) {
return mqueue ? 1 : 0;
}
ddb_event_t *
messagepump_event_alloc (uint32_t id) {
int sz = 0;
ddb_event_t *ev;
switch (id) {
case DB_EV_SONGCHANGED:
sz = sizeof (ddb_event_trackchange_t);
break;
case DB_EV_SONGSTARTED:
case DB_EV_SONGFINISHED:
case DB_EV_TRACKINFOCHANGED:
sz = sizeof (ddb_event_track_t);
break;
case DB_EV_SEEKED:
sz = sizeof (ddb_event_playpos_t);
break;
}
assert (("Invalid event %d to use with messagepump_event_alloc, use sendmessage instead\n", id));
ev = malloc (sz);
memset (ev, 0, sz);
ev->event = id;
ev->size = sz;
return ev;
}
void
messagepump_event_free (ddb_event_t *ev) {
switch (ev->event) {
case DB_EV_SONGCHANGED:
{
ddb_event_trackchange_t *tc = (ddb_event_trackchange_t*)ev;
if (tc->from) {
pl_item_unref ((playItem_t *)tc->from);
}
if (tc->to) {
pl_item_unref ((playItem_t *)tc->to);
}
}
break;
case DB_EV_SONGSTARTED:
case DB_EV_SONGFINISHED:
case DB_EV_TRACKINFOCHANGED:
{
ddb_event_track_t *tc = (ddb_event_track_t*)ev;
if (tc->track) {
pl_item_unref ((playItem_t *)tc->track);
}
}
break;
case DB_EV_SEEKED:
{
ddb_event_playpos_t *tc = (ddb_event_playpos_t*)ev;
if (tc->track) {
pl_item_unref ((playItem_t *)tc->track);
}
}
break;
}
free (ev);
}
int
messagepump_push_event (ddb_event_t *ev, uint32_t p1, uint32_t p2) {
return messagepump_push (ev->event, (uintptr_t)ev, p1, p2);
}
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