/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
+ * 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* gstthread.c: Threaded container object
*
* Boston, MA 02111-1307, USA.
*/
-#include <unistd.h>
-
-/* #define GST_DEBUG_ENABLED */
-#include "gst_private.h"
-
-#include "gst.h"
#include "gstthread.h"
#include "gstscheduler.h"
-#include "gstqueue.h"
+#include "gstinfo.h"
+#include "gstlog.h"
#define STACK_SIZE 0x200000
-#define g_thread_equal(a,b) ((a) == (b))
-
GstElementDetails gst_thread_details = {
"Threaded container",
"Generic/Bin",
"LGPL",
"Container that creates/manages a thread",
VERSION,
- "Erik Walthinsen <omega@cse.ogi.edu>",
- "(C) 1999, 2000",
+ "Erik Walthinsen <omega@cse.ogi.edu>,"
+ "Benjamin Otte <in7y118@informatik.uni-hamburg.de",
+ "(C) 1999-2003",
};
const GValue *value, GParamSpec *pspec);
static void gst_thread_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
-static
-GstElementStateReturn gst_thread_change_state (GstElement *element);
+static GstElementStateReturn gst_thread_change_state (GstElement *element);
+static void gst_thread_child_state_change (GstBin *bin, GstElementState oldstate,
+ GstElementState newstate, GstElement *element);
+
+static void gst_thread_catch (GstThread *thread);
+static void gst_thread_release (GstThread *thread);
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr gst_thread_save_thyself (GstObject *object,
xmlNodePtr self);
#endif
-static void* gst_thread_main_loop (void *arg);
+static void * gst_thread_main_loop (void *arg);
#define GST_TYPE_THREAD_PRIORITY (gst_thread_priority_get_type())
static GType
static GstBinClass *parent_class = NULL;
static guint gst_thread_signals[LAST_SIGNAL] = { 0 };
+GPrivate *gst_thread_current;
GType
gst_thread_get_type(void) {
return thread_type;
}
+static void do_nothing (gpointer hi) {}
static void
gst_thread_class_init (GstThreadClass *klass)
{
GstElementClass *gstelement_class;
GstBinClass *gstbin_class;
+ /* setup gst_thread_current */
+ gst_thread_current = g_private_new (do_nothing);
+
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_thread_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_thread_get_property);
+ gstbin_class->child_state_change = GST_DEBUG_FUNCPTR (gst_thread_child_state_change);
}
static void
g_assert (scheduler);
thread->lock = g_mutex_new ();
- thread->cond_t = g_cond_new ();
- thread->cond_m = g_cond_new ();
+ thread->cond = g_cond_new ();
- thread->ppid = getpid ();
thread->thread_id = (GThread *) NULL; /* set in NULL -> READY */
thread->priority = G_THREAD_PRIORITY_NORMAL;
- thread->stack = NULL;
}
static void
{
GstThread *thread = GST_THREAD (object);
- GST_DEBUG (GST_CAT_REFCOUNTING, "dispose");
+ GST_DEBUG (GST_CAT_REFCOUNTING, "GstThread: dispose");
- g_mutex_lock (thread->lock);
- if (GST_STATE (thread) != GST_STATE_NULL) {
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
- }
- g_mutex_unlock (thread->lock);
+ G_OBJECT_CLASS (parent_class)->dispose (object);
- gst_element_set_state (GST_ELEMENT (thread), GST_STATE_NULL);
+ g_assert (GST_STATE (thread) == GST_STATE_NULL);
g_mutex_free (thread->lock);
- g_cond_free (thread->cond_t);
- g_cond_free (thread->cond_m);
+ g_cond_free (thread->cond);
gst_object_replace ((GstObject **)&GST_ELEMENT_SCHED (thread), NULL);
-
- G_OBJECT_CLASS (parent_class)->dispose (object);
}
/**
return gst_element_factory_make ("thread", name);
}
-/* these two macros are used for debug/info from the state_change function */
-
-/* FIXME: with some rearranging of output or otherwise we could probably
- * get rid of this g_strdup_printf we're using here, so go ahead if you're
- * concerned about this slowing down */
-#ifdef G_HAVE_ISO_VARARGS
-
-#define THR_INFO(...) \
- { \
- gchar *val = g_strdup_printf(__VA_ARGS__); \
- GST_INFO_ELEMENT(GST_CAT_THREAD, thread, \
- "sync(" GST_DEBUG_THREAD_FORMAT "): %s", \
- GST_DEBUG_THREAD_ARGS(thread->pid), val); \
- g_free(val); \
- }
-
-#define THR_DEBUG(...) \
- { \
- gchar *val = g_strdup_printf(__VA_ARGS__); \
- GST_INFO_ELEMENT(GST_CAT_THREAD, thread, \
- "sync(" GST_DEBUG_THREAD_FORMAT "): %s", \
- GST_DEBUG_THREAD_ARGS(thread->pid), val); \
- g_free(val); \
- }
-
-/* these two macros are used for debug/info from the gst_thread_main_loop
- * function
- */
-
-#define THR_INFO_MAIN(...) \
- { \
- gchar *val = g_strdup_printf(__VA_ARGS__); \
- GST_INFO_ELEMENT(GST_CAT_THREAD, thread, \
- "sync-main(" GST_DEBUG_THREAD_FORMAT "): %s", \
- GST_DEBUG_THREAD_ARGS(thread->pid), val); \
- g_free(val); \
- }
-
-#define THR_DEBUG_MAIN(...) \
- { \
- gchar *val = g_strdup_printf(__VA_ARGS__); \
- GST_INFO_ELEMENT(GST_CAT_THREAD, thread, \
- "sync-main(" GST_DEBUG_THREAD_FORMAT "): %s", \
- GST_DEBUG_THREAD_ARGS(thread->pid), val); \
- g_free(val); \
- }
-
-#elif defined(G_HAVE_GNUC_VARARGS)
-
-#define THR_INFO(format,args...) \
- GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
- GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
-
-#define THR_DEBUG(format,args...) \
- GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
- GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
-
-/* these two macros are used for debug/info from the gst_thread_main_loop
- * function
+/**
+ * gst_thread_get_current:
+ *
+ * Create a new thread with the given name.
+ *
+ * Returns: The current GstThread or NULL if you are not running inside a
+ * #GstThread.
*/
+GstThread *
+gst_thread_get_current (void)
+{
+ return (GstThread *) g_private_get (gst_thread_current);
+}
-#define THR_INFO_MAIN(format,args...) \
- GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
- GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
+static inline void
+gst_thread_release_children_locks (GstThread *thread)
+{
+ GstRealPad *peer = NULL;
+ GstElement *peerelement;
+ GList *elements = (GList *) gst_bin_get_list (GST_BIN (thread));
+
+ while (elements) {
+ GstElement *element = GST_ELEMENT (elements->data);
+ GList *pads;
+
+ g_assert (element);
+ GST_DEBUG (GST_CAT_THREAD, "waking element \"%s\"", GST_ELEMENT_NAME (element));
+ elements = g_list_next (elements);
+
+ if (!gst_element_release_locks (element))
+ g_warning ("element %s could not release locks", GST_ELEMENT_NAME (element));
+
+ pads = GST_ELEMENT_PADS (element);
+
+ while (pads) {
+ if (GST_PAD_PEER (pads->data)) {
+ peer = GST_REAL_PAD (GST_PAD_PEER (pads->data));
+ pads = g_list_next (pads);
+ } else {
+ pads = g_list_next (pads);
+ continue;
+ }
-#define THR_DEBUG_MAIN(format,args...) \
- GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
- GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
+ if (!peer)
+ continue;
-#endif
+ peerelement = GST_PAD_PARENT (peer);
+ if (!peerelement)
+ continue; /* FIXME: deal with case where there's no peer */
-static GstElementStateReturn
-gst_thread_update_state (GstThread *thread)
+ if (GST_ELEMENT_SCHED (peerelement) != GST_ELEMENT_SCHED (thread)) {
+ GST_DEBUG (GST_CAT_THREAD, "element \"%s\" has pad cross sched boundary", GST_ELEMENT_NAME (element));
+ GST_DEBUG (GST_CAT_THREAD, "waking element \"%s\"", GST_ELEMENT_NAME (peerelement));
+ if (!gst_element_release_locks (peerelement))
+ g_warning ("element %s could not release locks", GST_ELEMENT_NAME (peerelement));
+ }
+ }
+ }
+}
+/* stops the main thread, if there is one and grabs the thread's mutex */
+static void
+gst_thread_catch (GstThread *thread)
{
- GST_DEBUG_ELEMENT (GST_CAT_THREAD, thread, "updating state of thread");
- /* check for state change */
- if (GST_STATE_PENDING (thread) != GST_STATE_VOID_PENDING) {
- /* punt and change state on all the children */
- if (GST_ELEMENT_CLASS (parent_class)->change_state)
- return GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT (thread));
+ gboolean wait;
+ g_mutex_lock (thread->lock);
+ if (thread != gst_thread_get_current()) {
+ /* another thread is trying to catch us */
+ wait = !GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING);
+ while (!wait) {
+ GTimeVal tv;
+ GST_DEBUG (GST_CAT_THREAD, "catching %s...", GST_ELEMENT_NAME (thread));
+ GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
+ g_cond_signal (thread->cond);
+ gst_thread_release_children_locks (thread);
+ g_get_current_time (&tv);
+ g_time_val_add (&tv, 1000); /* wait a millisecond to catch the thread */
+ wait = g_cond_timed_wait (thread->cond, thread->lock, &tv);
+ }
+ GST_DEBUG (GST_CAT_THREAD, "caught %s", GST_ELEMENT_NAME (thread));
}
-
- /* FIXME: in the case of no change_state function in the parent's class,
- * shouldn't we actually change the thread's state ? */
- g_warning ("thread's parent doesn't have change_state, returning success");
- return GST_STATE_SUCCESS;
+ g_assert (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING));
+}
+static void
+gst_thread_release (GstThread *thread)
+{
+ g_cond_signal (thread->cond);
+ g_mutex_unlock (thread->lock);
}
-
-
static GstElementStateReturn
gst_thread_change_state (GstElement *element)
{
GstThread *thread;
- gboolean stateset = GST_STATE_SUCCESS;
- gint transition;
- GThread *self = g_thread_self ();
- GError *error = NULL;
+ GstElementStateReturn ret;
g_return_val_if_fail (GST_IS_THREAD (element), GST_STATE_FAILURE);
- g_return_val_if_fail (gst_has_threads (), GST_STATE_FAILURE);
thread = GST_THREAD (element);
- transition = GST_STATE_TRANSITION (element);
+ GST_DEBUG (GST_CAT_STATES, "%s is changing state from %s to %s",
+ GST_ELEMENT_NAME (element), gst_element_state_get_name (GST_STATE (element)),
+ gst_element_state_get_name (GST_STATE_PENDING (element)));
- THR_INFO ("changing state from %s to %s",
- gst_element_state_get_name (GST_STATE (element)),
- gst_element_state_get_name (GST_STATE_PENDING (element)));
+ gst_thread_catch (thread);
- if (g_thread_equal (self, thread->thread_id)) {
- GST_DEBUG (GST_CAT_THREAD,
- "no sync(" GST_DEBUG_THREAD_FORMAT "): "
- "setting own thread's state to spinning",
- GST_DEBUG_THREAD_ARGS (thread->pid));
- return gst_thread_update_state (thread);
- }
-
- switch (transition) {
+ switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
- /* set the state to idle */
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
-
- THR_DEBUG ("creating thread \"%s\"", GST_ELEMENT_NAME (element));
-
- /* this bit of code handles creation of GThreads
- * this is therefor tricky code
- * compare it with the block of code that handles the destruction
- * in GST_STATE_READY_TO_NULL below
- */
- g_mutex_lock (thread->lock);
-
- /* create a new GThread
- * use the specified attributes
- * make it execute gst_thread_main_loop (thread)
- */
- GST_DEBUG (GST_CAT_THREAD, "going to g_thread_create_full...");
+ /* create the thread */
+ GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
thread->thread_id = g_thread_create_full(gst_thread_main_loop,
- thread, STACK_SIZE, TRUE, TRUE, thread->priority,
- &error);
-
+ thread, STACK_SIZE, FALSE, TRUE, thread->priority,
+ NULL);
if (!thread->thread_id){
- GST_DEBUG (GST_CAT_THREAD, "g_thread_create_full failed");
- g_mutex_unlock (thread->lock);
- GST_DEBUG (GST_CAT_THREAD, "could not create thread \"%s\"",
- GST_ELEMENT_NAME (element));
-
- return GST_STATE_FAILURE;
+ GST_DEBUG (GST_CAT_THREAD, "g_thread_create_full for %sfailed", GST_ELEMENT_NAME (element));
+ goto error_out;
}
GST_DEBUG (GST_CAT_THREAD, "GThread created");
/* wait for it to 'spin up' */
- THR_DEBUG ("waiting for child thread spinup");
- g_cond_wait (thread->cond_m, thread->lock);
- THR_DEBUG ("thread claims to be up");
- g_mutex_unlock (thread->lock);
+ g_cond_wait (thread->cond, thread->lock);
break;
case GST_STATE_READY_TO_PAUSED:
- THR_INFO ("readying thread");
- g_mutex_lock (thread->lock);
- THR_DEBUG ("signaling");
- g_cond_signal (thread->cond_t);
- THR_DEBUG ("waiting for ack");
- g_cond_wait (thread->cond_m, thread->lock);
- THR_DEBUG ("got ack");
- g_mutex_unlock (thread->lock);
break;
case GST_STATE_PAUSED_TO_PLAYING:
{
- /* fixme: recurse into sub-bins */
- const GList *elements = gst_bin_get_list (GST_BIN (thread));
+ /* FIXME: recurse into sub-bins */
+ GList *elements = (GList *) gst_bin_get_list (GST_BIN (thread));
while (elements) {
gst_element_enable_threadsafe_properties ((GstElement*)elements->data);
elements = g_list_next (elements);
}
-
- THR_DEBUG ("telling thread to start spinning");
- g_mutex_lock (thread->lock);
- THR_DEBUG ("signaling");
- g_cond_signal (thread->cond_t);
- THR_DEBUG ("waiting for ack");
- g_cond_wait (thread->cond_m, thread->lock);
- THR_DEBUG ("got ack");
- g_mutex_unlock (thread->lock);
-
- /* we're actually doing async notification, the state could
- * have changed already (eg. EOS) here. commented out as
- * it needs more thinking... */
- /* stateset = GST_STATE_ASYNC; */
break;
}
case GST_STATE_PLAYING_TO_PAUSED:
{
- const GList *elements = (GList *) gst_bin_get_list (GST_BIN (thread));
-
- THR_INFO ("pausing thread");
-
- /* the following code ensures that the bottom half of thread will run
- * to perform each elements' change_state() (by calling gstbin.c::
- * change_state()).
- * + the pending state was already set by gstelement.c::set_state()
- * + unlock all elements so the bottom half can start the state change.
- */
- g_mutex_lock (thread->lock);
-
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
-
- while (elements) {
- GstElement *element = GST_ELEMENT (elements->data);
- GList *pads;
-
- g_assert (element);
- THR_DEBUG (" waking element \"%s\"", GST_ELEMENT_NAME (element));
- elements = g_list_next (elements);
-
- if (!gst_element_release_locks (element)) {
- g_warning ("element %s could not release locks",
- GST_ELEMENT_NAME (element));
- }
-
- pads = GST_ELEMENT_PADS (element);
-
- while (pads) {
- GstRealPad *peer = NULL;
- GstElement *peerelement;
-
- if (GST_PAD_PEER (pads->data))
- peer = GST_REAL_PAD (GST_PAD_PEER (pads->data));
-
- pads = g_list_next (pads);
-
- if (!peer)
- continue;
-
- peerelement = GST_PAD_PARENT (peer);
- if (!peerelement)
- continue; /* deal with case where there's no peer */
-
- if (!GST_FLAG_IS_SET (peerelement, GST_ELEMENT_DECOUPLED)) {
- GST_DEBUG (GST_CAT_THREAD, "peer element isn't DECOUPLED");
- continue;
- }
-
- if (GST_ELEMENT_SCHED (peerelement) != GST_ELEMENT_SCHED (thread)) {
- THR_DEBUG (" element \"%s\" has pad cross sched boundary", GST_ELEMENT_NAME (element));
- THR_DEBUG (" waking element \"%s\"", GST_ELEMENT_NAME (peerelement));
- if (!gst_element_release_locks (peerelement)) {
- g_warning ("element %s could not release locks", GST_ELEMENT_NAME (peerelement));
- }
- }
- }
-
- }
- THR_DEBUG ("telling thread to pause, signaling");
- g_cond_signal (thread->cond_t);
- THR_DEBUG ("waiting for ack");
- g_cond_wait (thread->cond_m, thread->lock);
- THR_DEBUG ("got ack");
- g_mutex_unlock (thread->lock);
-
- elements = gst_bin_get_list (GST_BIN (thread));
+ GList *elements = (GList *) gst_bin_get_list (GST_BIN (thread));
while (elements) {
gst_element_disable_threadsafe_properties ((GstElement*)elements->data);
elements = g_list_next (elements);
}
break;
}
+ case GST_STATE_PAUSED_TO_READY:
+ break;
case GST_STATE_READY_TO_NULL:
- THR_DEBUG ("telling thread to pause (null) - and joining");
- /* MattH FIXME revisit */
- g_mutex_lock (thread->lock);
- THR_DEBUG ("signaling");
- g_cond_signal (thread->cond_t);
- THR_DEBUG ("waiting for ack");
- g_cond_wait (thread->cond_m, thread->lock);
- THR_DEBUG ("got ack");
-
-
- /* this block of code is very tricky
- * basically, we try to clean up the whole thread and
- * everything related to it in the right order without
- * triggering segfaults
- * compare this block to the block
- */
-
- GST_DEBUG (GST_CAT_THREAD, "joining GThread %p", thread->thread_id);
- g_thread_join (thread->thread_id);
-
+ /* we can't join the threads here, because this could have been triggered
+ by ourself (ouch) */
+ GST_DEBUG (GST_CAT_THREAD, "destroying GThread %p", thread->thread_id);
+ GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
thread->thread_id = NULL;
- thread->stack = NULL;
-
- THR_DEBUG ("unlocking mutex");
- g_mutex_unlock (thread->lock);
+ if (thread == gst_thread_get_current()) {
+ /* or should we continue? */
+ g_warning ("Thread %s is destroying itself. Function call will not return!", GST_ELEMENT_NAME (thread));
+ gst_scheduler_reset (GST_ELEMENT_SCHED (thread));
+
+ /* unlock and signal - we are out */
+ gst_thread_release (thread);
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_STARTED);
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
+ GST_INFO (GST_CAT_THREAD, "gstthread: thread \"%s\" is stopped",
+ GST_ELEMENT_NAME (thread));
- break;
- case GST_STATE_PAUSED_TO_READY:
- THR_DEBUG ("telling thread to stop spinning");
- g_mutex_lock (thread->lock);
- THR_DEBUG ("signaling");
- g_cond_signal (thread->cond_t);
- THR_DEBUG ("waiting for ack");
- g_cond_wait (thread->cond_m, thread->lock);
- THR_DEBUG ("got ack");
- g_mutex_unlock (thread->lock);
+ g_signal_emit (G_OBJECT (thread), gst_thread_signals[SHUTDOWN], 0);
+ g_thread_exit (NULL);
+ }
+ /* now wait for the thread to destroy itself */
+ g_cond_signal (thread->cond);
+ g_cond_wait (thread->cond, thread->lock);
+ /* it should be dead now */
break;
default:
- GST_DEBUG_ELEMENT (GST_CAT_THREAD, element, "UNHANDLED STATE CHANGE! %x", transition);
+ GST_DEBUG_ELEMENT (GST_CAT_THREAD, element, "UNHANDLED STATE CHANGE! %x",
+ GST_STATE_TRANSITION (element));
+ g_assert_not_reached ();
break;
}
- return stateset;
+ if (GST_ELEMENT_CLASS (parent_class)->change_state) {
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT (thread));
+ } else {
+ ret = GST_STATE_SUCCESS;
+ }
+
+ gst_thread_release (thread);
+ return ret;
+
+error_out:
+ GST_DEBUG (GST_CAT_STATES, "changing state from %s to %s failed for %s",
+ gst_element_state_get_name (GST_STATE (element)),
+ gst_element_state_get_name (GST_STATE_PENDING (element)),
+ GST_ELEMENT_NAME (element));
+ gst_thread_release (thread);
+ return GST_STATE_FAILURE;
}
+/* state changes work this way: We grab the lock and stop the thread from
+ spinning (via gst_thread_catch) - then we change the state. After that the
+ thread may spin on. */
+static void
+gst_thread_child_state_change (GstBin *bin, GstElementState oldstate,
+ GstElementState newstate, GstElement *element)
+{
+ parent_class->child_state_change (bin, oldstate, newstate, element);
+ /* We'll wake up the main thread now. Note that we can't lock the thread here,
+ because we might be called from inside gst_thread_change_state when holding
+ the lock. But this doesn't cause any problems. */
+ if (newstate == GST_STATE_PLAYING)
+ g_cond_signal (GST_THREAD (bin)->cond);
+}
/**
* gst_thread_main_loop:
* @arg: the thread to start
gst_thread_main_loop (void *arg)
{
GstThread *thread = NULL;
- gint stateset;
- glong page_size;
- gpointer stack_pointer;
- gulong stack_offset;
+ gboolean status;
- GST_DEBUG (GST_CAT_THREAD, "gst_thread_main_loop started");
thread = GST_THREAD (arg);
g_mutex_lock (thread->lock);
+ GST_DEBUG (GST_CAT_THREAD, "Thread %s started main loop", GST_ELEMENT_NAME (thread));
+
+ /* initialize gst_thread_current */
+ g_private_set (gst_thread_current, thread);
/* set up the element's scheduler */
gst_scheduler_setup (GST_ELEMENT_SCHED (thread));
GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
- thread->pid = getpid();
- THR_INFO_MAIN ("thread is running");
-
- page_size = sysconf(_SC_PAGESIZE);
- stack_pointer = (gpointer) &stack_pointer;
-
- if(((gulong)stack_pointer & (page_size-1)) < (page_size>>1)){
- /* stack grows up, I think */
- /* FIXME this is probably not true for the main thread */
- stack_offset = (gulong)stack_pointer & (page_size - 1);
- }else{
- /* stack grows down, I think */
- stack_offset = STACK_SIZE - ((gulong)stack_pointer & (page_size - 1));
- }
- /* note the subtlety with pointer arithmetic */
- thread->stack = stack_pointer - stack_offset;
- thread->stack_size = STACK_SIZE;
-
- /* first we need to change the state of all the children */
- if (GST_ELEMENT_CLASS (parent_class)->change_state) {
- stateset = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
-
- if (stateset != GST_STATE_SUCCESS) {
- THR_DEBUG_MAIN ("state change of children failed");
- }
- }
-
- THR_DEBUG_MAIN ("indicating spinup");
- g_cond_signal (thread->cond_m);
- /* don't unlock the mutex because we hold it into the top of the while loop */
- THR_DEBUG_MAIN ("thread has indicated spinup to parent process");
-
- /***** THREAD IS NOW IN READY STATE *****/
-
- /* CR1: most of this code is handshaking */
- /* do this while the thread lives */
- while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
- /* NOTE we hold the thread lock at this point */
- /* what we do depends on what state we're in */
- switch (GST_STATE (thread)) {
- /* NOTE: cannot be in NULL, we're not running in that state at all */
- case GST_STATE_READY:
- /* wait to be set to either the NULL or PAUSED states */
- THR_DEBUG_MAIN ("thread in %s state, waiting for either %s or %s",
- gst_element_state_get_name (GST_STATE_READY),
- gst_element_state_get_name (GST_STATE_NULL),
- gst_element_state_get_name (GST_STATE_PAUSED));
- g_cond_wait (thread->cond_t, thread->lock);
-
- /* this must have happened by a state change in the thread context */
- if (GST_STATE_PENDING (thread) != GST_STATE_NULL &&
- GST_STATE_PENDING (thread) != GST_STATE_PAUSED) {
- g_cond_signal (thread->cond_m);
- continue;
- }
-
- /* been signaled, we need to state transition now and signal back */
- gst_thread_update_state (thread);
- /* now we decide what to do next */
- if (GST_STATE (thread) == GST_STATE_NULL) {
- /* REAPING must be set, we can simply break this iteration */
- THR_DEBUG_MAIN ("set GST_THREAD_STATE_REAPING");
- GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
- }
- THR_DEBUG_MAIN ("done with state transition, "
- "signaling back to parent process");
- g_cond_signal (thread->cond_m);
- continue;
-
- case GST_STATE_PAUSED:
- /* wait to be set to either the READY or PLAYING states */
- THR_DEBUG_MAIN ("thread in %s state, waiting for either %s or %s",
- gst_element_state_get_name (GST_STATE_PAUSED),
- gst_element_state_get_name (GST_STATE_READY),
- gst_element_state_get_name (GST_STATE_PLAYING));
- g_cond_wait (thread->cond_t, thread->lock);
-
- /* this must have happened by a state change in the thread context */
- if (GST_STATE_PENDING (thread) != GST_STATE_READY &&
- GST_STATE_PENDING (thread) != GST_STATE_PLAYING) {
- g_cond_signal (thread->cond_m);
- continue;
- }
-
- /* been signaled, we need to state transition now and signal back */
- gst_thread_update_state (thread);
-
- /* now we decide what to do next */
- if (GST_STATE (thread) != GST_STATE_PLAYING) {
- /* either READY or the state change failed for some reason */
- g_cond_signal (thread->cond_m);
- continue;
- }
- else {
- GST_FLAG_SET (thread, GST_THREAD_STATE_SPINNING);
- /* PLAYING is coming up, so we can now start spinning */
- while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
- gboolean status;
-
- g_cond_signal (thread->cond_m);
- g_mutex_unlock (thread->lock);
- status = gst_bin_iterate (GST_BIN (thread));
- g_mutex_lock (thread->lock);
- /* g_cond_signal(thread->cond); */
-
- if (!status || GST_STATE_PENDING (thread) != GST_STATE_VOID_PENDING)
- GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
- }
- /* looks like we were stopped because of a statechange */
- if (GST_STATE_PENDING (thread) != GST_STATE_VOID_PENDING) {
- gst_thread_update_state (thread);
- }
- /* once we're here, SPINNING has stopped, we should signal that we're done */
- THR_DEBUG_MAIN ("SPINNING stopped, signaling back to parent process");
- g_cond_signal (thread->cond_m);
- /* now we can wait for PAUSED */
- continue;
- }
- case GST_STATE_PLAYING:
- /* wait to be set to PAUSED */
- THR_DEBUG_MAIN ("thread in %s state, waiting for %s",
- gst_element_state_get_name (GST_STATE_PLAYING),
- gst_element_state_get_name (GST_STATE_PAUSED));
- g_cond_wait (thread->cond_t,thread->lock);
-
- /* been signaled, we need to state transition now and signal back */
- gst_thread_update_state (thread);
- g_cond_signal (thread->cond_m);
- /* now we decide what to do next */
- /* there's only PAUSED, we we just wait for it */
- continue;
- case GST_STATE_NULL:
- THR_DEBUG_MAIN ("thread in %s state, preparing to die",
- gst_element_state_get_name (GST_STATE_NULL));
- GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
- break;
- default:
- g_assert_not_reached ();
- break;
+ g_cond_signal (thread->cond);
+ while (!(GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING))) {
+ if (GST_STATE (thread) == GST_STATE_PLAYING) {
+ GST_FLAG_SET (thread, GST_THREAD_STATE_SPINNING);
+ status = TRUE;
+ GST_DEBUG (GST_CAT_THREAD, "%s starts iterating\n", GST_ELEMENT_NAME (thread));
+ while (status && GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
+ g_mutex_unlock (thread->lock);
+ status = gst_bin_iterate (GST_BIN (thread));
+ g_mutex_lock (thread->lock);
+ }
+ GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
}
+ if (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING))
+ break;
+ GST_DEBUG (GST_CAT_THREAD, "%s was caught\n", GST_ELEMENT_NAME (thread));
+ g_cond_signal (thread->cond);
+ g_cond_wait (thread->cond, thread->lock);
}
- /* THREAD HAS STOPPED RUNNING */
-
/* we need to destroy the scheduler here because it has mapped it's
* stack into the threads stack space */
gst_scheduler_reset (GST_ELEMENT_SCHED (thread));
- /* since we don't unlock at the end of the while loop, do it here */
+ /* unlock and signal - we are out */
+ g_cond_signal (thread->cond);
g_mutex_unlock (thread->lock);
GST_INFO (GST_CAT_THREAD, "gstthread: thread \"%s\" is stopped",
- GST_ELEMENT_NAME (thread));
+ GST_ELEMENT_NAME (thread));
g_signal_emit (G_OBJECT (thread), gst_thread_signals[SHUTDOWN], 0);
projects / platform / upstream / gstreamer.git / commitdiff