/*
* Copyright (c) 2004 François Revol <revol@free.fr>
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
//#define DEBUG
int ret;
}ThreadContext;
+// it's odd Be never patented that :D
+struct benaphore {
+ vint32 atom;
+ sem_id sem;
+};
+static inline int lock_ben(struct benaphore *ben)
+{
+ if (atomic_add(&ben->atom, 1) > 0)
+ return acquire_sem(ben->sem);
+ return B_OK;
+}
+static inline int unlock_ben(struct benaphore *ben)
+{
+ if (atomic_add(&ben->atom, -1) > 1)
+ return release_sem(ben->sem);
+ return B_OK;
+}
+
+static struct benaphore av_thread_lib_ben;
static int32 ff_thread_func(void *v){
ThreadContext *c= v;
//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
release_sem(c->done_sem);
}
-
+
return B_OK;
}
int32 ret;
for(i=0; i<s->thread_count; i++){
-
+
c[i].func= NULL;
release_sem(c[i].work_sem);
wait_for_thread(c[i].thread, &ret);
int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
ThreadContext *c= s->thread_opaque;
int i;
-
+
assert(s == c->avctx);
assert(count <= s->thread_count);
-
+
/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
for(i=0; i<count; i++){
}
for(i=0; i<count; i++){
acquire_sem(c[i].done_sem);
-
+
c[i].func= NULL;
if(ret) ret[i]= c[i].ret;
}
assert(!s->thread_opaque);
c= av_mallocz(sizeof(ThreadContext)*thread_count);
s->thread_opaque= c;
-
+
for(i=0; i<thread_count; i++){
//printf("init semaphors %d\n", i); fflush(stdout);
c[i].avctx= s;
resume_thread(c[i].thread );
}
//printf("init done\n"); fflush(stdout);
-
+
s->execute= avcodec_thread_execute;
return 0;
avcodec_thread_free(s);
return -1;
}
+
+/* provide a mean to serialize calls to avcodec_*() for thread safety. */
+
+int avcodec_thread_lock_lib(void)
+{
+ return lock_ben(&av_thread_lib_ben);
+}
+
+int avcodec_thread_unlock_lib(void)
+{
+ return unlock_ben(&av_thread_lib_ben);
+}
+
+/* our versions of _init and _fini (which are called by those actually from crt.o) */
+
+void initialize_after(void)
+{
+ av_thread_lib_ben.atom = 0;
+ av_thread_lib_ben.sem = create_sem(0, "libavcodec benaphore");
+}
+
+void uninitialize_before(void)
+{
+ delete_sem(av_thread_lib_ben.sem);
+}
+
+
+