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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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284bfca414
Original commit message from CVS: Added element-level locking support, implemented for cothreads with a mutex held whenever an element is actually currently running. This should be done with atomic variables eventually, but the best I can find is to use <asm/spinlock.h> from the kernel, which brings in too much for my taste. Also increased cothread stack size to 32KB and max cothread count to 64, which fits within the default pthread 2MB stack. It would probably be good to do a pthread_attr_getstacksize() to verify that it's 2MB, and if linuxthreads had a pthread_attr_setstacksize(), we could remove these limits.
141 lines
4.5 KiB
C
141 lines
4.5 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstscheduler.h: Header for default scheduler code
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_SCHEDULER_H__
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#define __GST_SCHEDULER_H__
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#include <gst/gstelement.h>
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#include <gst/gstbin.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_SCHEDULE \
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(gst_schedule_get_type())
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#define GST_SCHEDULE(obj) \
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(GTK_CHECK_CAST((obj),GST_TYPE_SCHEDULE,GstSchedule))
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#define GST_SCHEDULE_CLASS(klass) \
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(GTK_CHECK_CLASS_CAST((klass),GST_TYPE_SCHEDULE,GstScheduleClass))
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#define GST_IS_SCHEDULE(obj) \
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(GTK_CHECK_TYPE((obj),GST_TYPE_SCHEDULE))
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#define GST_IS_SCHEDULE_CLASS(klass) \
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(GTK_CHECK_CLASS_TYPE((klass),GST_TYPE_SCHEDULE))
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//typedef struct _GstSchedule GstSchedule;
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//typedef struct _GstScheduleClass GstScheduleClass;
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typedef struct _GstScheduleChain GstScheduleChain;
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struct _GstSchedule {
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GstObject object;
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GstElement *parent;
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GList *elements;
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gint num_elements;
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GList *chains;
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gint num_chains;
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void (*add_element) (GstSchedule *sched, GstElement *element);
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void (*remove_element) (GstSchedule *sched, GstElement *element);
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void (*enable_element) (GstSchedule *sched, GstElement *element);
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void (*disable_element) (GstSchedule *sched, GstElement *element);
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void (*lock_element) (GstSchedule *sched, GstElement *element);
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void (*unlock_element) (GstSchedule *sched, GstElement *element);
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void (*pad_connect) (GstSchedule *sched, GstPad *srcpad, GstPad *sinkpad);
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void (*pad_disconnect) (GstSchedule *sched, GstPad *srcpad, GstPad *sinkpad);
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gboolean (*iterate) (GstSchedule *sched);
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};
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struct _GstScheduleClass {
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GstObjectClass parent_class;
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};
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//#define GST_SCHEDULE_SAFETY if (sched)
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#define GST_SCHEDULE_SAFETY
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#define GST_SCHEDULE_ADD_ELEMENT(sched,element) \
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GST_SCHEDULE_SAFETY ((sched)->add_element((sched),(element)))
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#define GST_SCHEDULE_REMOVE_ELEMENT(sched,element) \
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GST_SCHEDULE_SAFETY ((sched)->remove_element((sched),(element)))
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#define GST_SCHEDULE_ENABLE_ELEMENT(sched,element) \
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GST_SCHEDULE_SAFETY ((sched)->enable_element((sched),(element)))
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#define GST_SCHEDULE_DISABLE_ELEMENT(sched,element) \
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GST_SCHEDULE_SAFETY ((sched)->disable_element((sched),(element)))
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#define GST_SCHEDULE_LOCK_ELEMENT(sched,element) \
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if ((sched)->lock_element != NULL) \
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((sched)->lock_element((sched),(element)))
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#define GST_SCHEDULE_UNLOCK_ELEMENT(sched,element) \
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if ((sched)->unlock_element != NULL) \
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((sched)->unlock_element((sched),(element)))
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#define GST_SCHEDULE_PAD_CONNECT(sched,srcpad,sinkpad) \
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GST_SCHEDULE_SAFETY ((sched)->pad_connect((sched),(srcpad),(sinkpad)))
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#define GST_SCHEDULE_PAD_DISCONNECT(sched,srcpad,sinkpad) \
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GST_SCHEDULE_SAFETY ((sched)->pad_disconnect((sched),(srcpad),(sinkpad)))
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#define GST_SCHEDULE_ITERATE(sched) \
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((sched)->iterate((sched)))
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struct _GstScheduleChain {
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GstSchedule *sched;
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GList *disabled;
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GList *elements;
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gint num_elements;
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GstElement *entry;
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gint cothreaded_elements;
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gboolean schedule;
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};
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void gst_bin_schedule_func(GstBin *bin);
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GtkType gst_schedule_get_type (void);
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GstSchedule * gst_schedule_new (GstElement *parent);
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void gst_schedule_add_element (GstSchedule *sched, GstElement *element);
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void gst_schedule_remove_element (GstSchedule *sched, GstElement *element);
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void gst_schedule_enable_element (GstSchedule *sched, GstElement *element);
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void gst_schedule_disable_element (GstSchedule *sched, GstElement *element);
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void gst_schedule_pad_connect (GstSchedule *sched, GstPad *srcpad, GstPad *sinkpad);
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void gst_schedule_pad_disconnect (GstSchedule *sched, GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_schedule_iterate (GstSchedule *sched);
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void gst_schedule_show (GstSchedule *sched);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_SCHEDULER_H__ */
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