[libgis] Improve threading

[Andy Spencer <andys src gnome org>]

commit d91172dc0108351719bc3e8097357349c0389378
Author: Andy Spencer <andy753421 gmail com>
Date:   Mon Apr 26 04:51:27 2010 +0000

    Improve threading
    
    - Clean up some gdk_thread_{enter,leave} calls
    - Fix bug in gis_viewer_add (linked list handling)
    - Call gtk_gl_init from gis-test (not sure if this is important)

 src/gis-opengl.c |   26 ++++++++++++--------------
 src/gis-test.c   |    2 ++
 src/gis-viewer.c |    1 -
 3 files changed, 14 insertions(+), 15 deletions(-)
---
diff --git a/src/gis-opengl.c b/src/gis-opengl.c
index 9501781..694a33e 100644
--- a/src/gis-opengl.c
+++ b/src/gis-opengl.c
@@ -441,7 +441,9 @@ static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
 	roam_sphere_draw(opengl->sphere);
 	//roam_sphere_draw_normals(opengl->sphere);
 #else
+	g_mutex_lock(opengl->objects_lock);
 	g_tree_foreach(opengl->objects, _draw_level, opengl);
+	g_mutex_unlock(opengl->objects_lock);
 	if (opengl->wireframe) {
 		glClear(GL_DEPTH_BUFFER_BIT);
 		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
@@ -462,7 +464,6 @@ static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 			event->keyval, event->state, GDK_plus);
 
 	guint kv = event->keyval;
-	gdk_threads_leave();
 	/* Testing */
 	if (kv == GDK_w) {
 		opengl->wireframe = !opengl->wireframe;
@@ -473,10 +474,7 @@ static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 	else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 	else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 	else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
-	gdk_threads_enter();
 	gtk_widget_queue_draw(GTK_WIDGET(opengl));
-#else
-	gdk_threads_enter();
 #endif
 	return FALSE;
 }
@@ -506,12 +504,10 @@ static void on_view_changed(GisOpenGL *opengl,
 static gboolean on_idle(GisOpenGL *opengl)
 {
 	//g_debug("GisOpenGL: on_idle");
-	gdk_threads_enter();
 	g_mutex_lock(opengl->sphere_lock);
 	if (roam_sphere_split_merge(opengl->sphere))
 		gtk_widget_queue_draw(GTK_WIDGET(opengl));
 	g_mutex_unlock(opengl->sphere_lock);
-	gdk_threads_leave();
 	return TRUE;
 }
 
@@ -610,8 +606,8 @@ static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
 {
 	g_assert(GIS_IS_OPENGL(_opengl));
 	GisOpenGL *opengl = GIS_OPENGL(_opengl);
-	_load_object(opengl, object);
 	g_mutex_lock(opengl->objects_lock);
+	_load_object(opengl, object);
 	struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 	if (!level) {
 		level = g_new0(struct RenderLevel, 1);
@@ -619,23 +615,25 @@ static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
 	}
 	GList *list = sort ? &level->sorted : &level->unsorted;
 	/* Put the link in the list */
-	GList *next = g_new0(GList, 1);
-	next->data = object;
-	next->prev = list;
-	next->next = list->next;
-	list->next = next;
+	GList *link = g_new0(GList, 1);
+	link->data = object;
+	link->prev = list;
+	link->next = list->next;
+	if (list->next)
+		list->next->prev = link;
+	list->next = link;
 	g_mutex_unlock(opengl->objects_lock);
-	return next;
+	return link;
 }
 
 static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
 {
 	g_assert(GIS_IS_OPENGL(_opengl));
 	GisOpenGL *opengl = GIS_OPENGL(_opengl);
+	g_mutex_lock(opengl->objects_lock);
 	GList *link = _link;
 	GisObject *object = link->data;
 	_unload_object(opengl, object);
-	g_mutex_lock(opengl->objects_lock);
 	/* Just unlink and free it, link->prev is assured */
 	link->prev->next = link->next;
 	if (link->next)
diff --git a/src/gis-test.c b/src/gis-test.c
index 7e973c1..53df1ea 100644
--- a/src/gis-test.c
+++ b/src/gis-test.c
@@ -17,6 +17,7 @@
 
 #include <config.h>
 #include <gtk/gtk.h>
+#include <gtk/gtkgl.h>
 #include <gdk/gdkkeysyms.h>
 
 #include "gis.h"
@@ -60,6 +61,7 @@ int main(int argc, char **argv)
 	g_thread_init(NULL);
 	gdk_threads_init();
 	gtk_init(&argc, &argv);
+	gtk_gl_init(&argc, &argv);
 
 	prefs   = gis_prefs_new(NULL, NULL);
 	plugins = gis_plugins_new(g_getenv("GIS_PLUGIN_PATH"), prefs);
diff --git a/src/gis-viewer.c b/src/gis-viewer.c
index f02d078..b89c37f 100644
--- a/src/gis-viewer.c
+++ b/src/gis-viewer.c
@@ -102,7 +102,6 @@ static gboolean on_key_press(GisViewer *viewer, GdkEventKey *event, gpointer _)
 	double lat, lon, elev, pan;
 	gis_viewer_get_location(viewer, &lat, &lon, &elev);
 	pan = MIN(elev/(EARTH_R/2), 30);
-	gdk_threads_leave();
 	switch (event->keyval) {
 	case GDK_Left:  case GDK_h: gis_viewer_pan(viewer,  0,  -pan, 0); break;
 	case GDK_Down:  case GDK_j: gis_viewer_pan(viewer, -pan, 0,   0); break;