Use atomic functions where appropriate

Also, rename atomic functions to be consistent with the rest of the
platform/threading functions, and move atomic functions to threading*
files rather than platform* files

libobs-opengl/gl-subsystem.h

@@ -18,6 +18,7 @@
 #pragma once
 
 #include <util/darray.h>
+#include <util/threading.h>
 #include <graphics/graphics.h>
 #include <graphics/matrix4.h>
 
@@ -285,12 +286,12 @@ struct gs_sampler_state {
 
 static inline void samplerstate_addref(samplerstate_t ss)
 {
-	ss->ref++;
+	os_atomic_inc_long(&ss->ref);
 }
 
 static inline void samplerstate_release(samplerstate_t ss)
 {
-	if (--ss->ref == 0)
+	if (os_atomic_dec_long(&ss->ref) == 0)
 		bfree(ss);
 }
 

libobs/graphics/graphics-internal.h

@@ -241,5 +241,5 @@ struct graphics_subsystem {
 	DARRAY(struct vec2)    texverts[16];
 
 	pthread_mutex_t        mutex;
-	volatile int           ref;
+	volatile long          ref;
 };

libobs/graphics/graphics.c

@@ -179,13 +179,13 @@ void gs_entercontext(graphics_t graphics)
 		thread_graphics = graphics;
 	}
 
-	graphics->ref++;
+	os_atomic_inc_long(&graphics->ref);
 }
 
 void gs_leavecontext(void)
 {
 	if (thread_graphics) {
-		if (!--thread_graphics->ref) {
+		if (!os_atomic_dec_long(&thread_graphics->ref)) {
 			graphics_t graphics = thread_graphics;
 
 			graphics->exports.device_leavecontext(graphics->device);

libobs/obs-data.c

@@ -16,11 +16,12 @@
 ******************************************************************************/
 
 #include "util/bmem.h"
+#include "util/threading.h"
 #include "util/darray.h"
 #include "obs-data.h"
 
 struct obs_data_item {
-	volatile int         ref;
+	volatile long        ref;
 	struct obs_data      *parent;
 	struct obs_data_item *next;
 	enum obs_data_type   type;
@@ -30,13 +31,13 @@ struct obs_data_item {
 };
 
 struct obs_data {
-	volatile int         ref;
+	volatile long        ref;
 	char                 *json;
 	struct obs_data_item *first_item;
 };
 
 struct obs_data_array {
-	volatile int         ref;
+	volatile long        ref;
 	DARRAY(obs_data_t)   objects;
 };
 
@@ -244,7 +245,7 @@ obs_data_t obs_data_create_from_json(const char *json_string)
 void obs_data_addref(obs_data_t data)
 {
 	if (data)
-		++data->ref;
+		os_atomic_inc_long(&data->ref);
 }
 
 static inline void obs_data_destroy(struct obs_data *data)
@@ -265,7 +266,7 @@ void obs_data_release(obs_data_t data)
 {
 	if (!data) return;
 
-	if (--data->ref == 0)
+	if (os_atomic_dec_long(&data->ref) == 0)
 		obs_data_destroy(data);
 }
 
@@ -466,7 +467,7 @@ obs_data_t obs_data_getobj(obs_data_t data, const char *name)
 	obs_data_t obj = get_item_obj(item);
 
 	if (obj)
-		obj->ref++;
+		os_atomic_inc_long(&obj->ref);
 	return obj;
 }
 
@@ -476,7 +477,7 @@ obs_data_array_t obs_data_getarray(obs_data_t data, const char *name)
 	obs_data_array_t array = get_item_array(item);
 
 	if (array)
-		array->ref++;
+		os_atomic_inc_long(&array->ref);
 	return array;
 }
 
@@ -491,7 +492,7 @@ obs_data_array_t obs_data_array_create()
 void obs_data_array_addref(obs_data_array_t array)
 {
 	if (array)
-		++array->ref;
+		os_atomic_inc_long(&array->ref);
 }
 
 static inline void obs_data_array_destroy(obs_data_array_t array)
@@ -509,7 +510,7 @@ void obs_data_array_release(obs_data_array_t array)
 	if (!array)
 		return;
 
-	if (--array->ref == 0)
+	if (os_atomic_dec_long(&array->ref) == 0)
 		obs_data_array_destroy(array);
 }
 
@@ -528,7 +529,7 @@ obs_data_t obs_data_array_item(obs_data_array_t array, size_t idx)
 	data = (idx < array->objects.num) ? array->objects.array[idx] : NULL;
 
 	if (data)
-		data->ref++;
+		os_atomic_inc_long(&data->ref);
 	return data;
 }
 
@@ -537,7 +538,7 @@ size_t obs_data_array_push_back(obs_data_array_t array, obs_data_t obj)
 	if (!array || !obj)
 		return 0;
 
-	obj->ref++;
+	os_atomic_inc_long(&obj->ref);
 	return da_push_back(array->objects, &obj);
 }
 
@@ -546,7 +547,7 @@ void obs_data_array_insert(obs_data_array_t array, size_t idx, obs_data_t obj)
 	if (!array || !obj)
 		return;
 
-	obj->ref++;
+	os_atomic_inc_long(&obj->ref);
 	da_insert(array->objects, idx, &obj);
 }
 
@@ -567,7 +568,7 @@ obs_data_item_t obs_data_first(obs_data_t data)
 		return NULL;
 
 	if (data->first_item)
-		data->first_item->ref++;
+		os_atomic_inc_long(&data->first_item->ref);
 	return data->first_item;
 }
 
@@ -578,18 +579,20 @@ obs_data_item_t obs_data_item_byname(obs_data_t data, const char *name)
 
 	struct obs_data_item *item = get_item(data, name);
 	if (item)
-		item->ref++;
+		os_atomic_inc_long(&item->ref);
 	return item;
 }
 
 bool obs_data_item_next(obs_data_item_t *item)
 {
 	if (item && *item) {
-		(*item)->ref--;
+		obs_data_item_t next = (*item)->next;
-		*item = (*item)->next;
+		obs_data_item_release(item);
 
-		if (*item) {
+		*item = next;
-			(*item)->ref++;
+
+		if (next) {
+			os_atomic_inc_long(&next->ref);
 			return true;
 		}
 	}
@@ -600,7 +603,7 @@ bool obs_data_item_next(obs_data_item_t *item)
 void obs_data_item_release(obs_data_item_t *item)
 {
 	if (item && *item) {
-		int ref = --(*item)->ref;
+		long ref = os_atomic_dec_long(&(*item)->ref);
 		if (!ref) {
 			obs_data_item_destroy(*item);
 			*item = NULL;
@@ -689,7 +692,7 @@ obs_data_t obs_data_item_getobj(obs_data_item_t item)
 		get_item_obj(item) : NULL;
 
 	if (obj)
-		obj->ref++;
+		os_atomic_inc_long(&obj->ref);
 	return obj;
 }
 
@@ -699,6 +702,6 @@ obs_data_array_t obs_data_item_getarray(obs_data_item_t item)
 		get_item_array(item) : NULL;
 
 	if (array)
-		array->ref++;
+		os_atomic_inc_long(&array->ref);
 	return array;
 }

libobs/obs-internal.h

@@ -176,7 +176,7 @@ extern void *obs_video_thread(void *param);
 /* sources  */
 
 struct obs_source {
-	volatile int                    refs;
+	volatile long                   refs;
 	struct obs_source_info          info;
 
 	/* source-specific data */
@@ -188,13 +188,13 @@ struct obs_source {
 	proc_handler_t                  procs;
 
 	/* ensures show/hide are only called once */
-	int                             show_refs;
+	volatile long                   show_refs;
 
 	/* ensures activate/deactivate are only called once */
-	int                             activate_refs;
+	volatile long                   activate_refs;
 
 	/* prevents infinite recursion when enumerating sources */
-	int                             enum_refs;
+	volatile long                   enum_refs;
 
 	/* used to indicate that the source has been removed and all
 	 * references to it should be released (not exactly how I would prefer
@@ -204,7 +204,7 @@ struct obs_source {
 	/* timing (if video is present, is based upon video) */
 	volatile bool                   timing_set;
 	volatile uint64_t               timing_adjust;
-	volatile int                    audio_reset_ref;
+	volatile long                   audio_reset_ref;
 	uint64_t                        next_audio_ts_min;
 	uint64_t                        last_frame_ts;
 	uint64_t                        last_sys_timestamp;

libobs/obs-scene.c

@@ -15,6 +15,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
 
+#include "util/threading.h"
 #include "graphics/math-defs.h"
 #include "obs-scene.h"
 
@@ -373,7 +374,7 @@ static void obs_sceneitem_destroy(obs_sceneitem_t item)
 void obs_sceneitem_addref(obs_sceneitem_t item)
 {
 	if (item)
-		++item->ref;
+		os_atomic_inc_long(&item->ref);
 }
 
 void obs_sceneitem_release(obs_sceneitem_t item)
@@ -381,7 +382,7 @@ void obs_sceneitem_release(obs_sceneitem_t item)
 	if (!item)
 		return;
 
-	if (--item->ref == 0)
+	if (os_atomic_dec_long(&item->ref) == 0)
 		obs_sceneitem_destroy(item);
 }
 

libobs/obs-scene.h

@@ -23,7 +23,7 @@
 /* how obs scene! */
 
 struct obs_scene_item {
-	volatile int          ref;
+	volatile long         ref;
 	volatile bool         removed;
 
 	struct obs_scene      *parent;

libobs/obs-source.c

@@ -19,6 +19,7 @@
 
 #include "media-io/format-conversion.h"
 #include "media-io/video-frame.h"
+#include "util/threading.h"
 #include "util/platform.h"
 #include "callback/calldata.h"
 #include "graphics/matrix3.h"
@@ -268,7 +269,7 @@ static void obs_source_destroy(struct obs_source *source)
 void obs_source_addref(obs_source_t source)
 {
 	if (source)
-		++source->refs;
+		os_atomic_inc_long(&source->refs);
 }
 
 void obs_source_release(obs_source_t source)
@@ -276,7 +277,7 @@ void obs_source_release(obs_source_t source)
 	if (!source)
 		return;
 
-	if (--source->refs == 0)
+	if (os_atomic_dec_long(&source->refs) == 0)
 		obs_source_destroy(source);
 }
 
@@ -380,7 +381,7 @@ static void hide_source(obs_source_t source)
 
 static void activate_tree(obs_source_t parent, obs_source_t child, void *param)
 {
-	if (++child->activate_refs == 1)
+	if (os_atomic_inc_long(&child->activate_refs) == 1)
 		activate_source(child);
 
 	UNUSED_PARAMETER(parent);
@@ -390,7 +391,7 @@ static void activate_tree(obs_source_t parent, obs_source_t child, void *param)
 static void deactivate_tree(obs_source_t parent, obs_source_t child,
 		void *param)
 {
-	if (--child->activate_refs == 0)
+	if (os_atomic_dec_long(&child->activate_refs) == 0)
 		deactivate_source(child);
 
 	UNUSED_PARAMETER(parent);
@@ -399,7 +400,7 @@ static void deactivate_tree(obs_source_t parent, obs_source_t child,
 
 static void show_tree(obs_source_t parent, obs_source_t child, void *param)
 {
-	if (++child->show_refs == 1)
+	if (os_atomic_inc_long(&child->show_refs) == 1)
 		show_source(child);
 
 	UNUSED_PARAMETER(parent);
@@ -408,7 +409,7 @@ static void show_tree(obs_source_t parent, obs_source_t child, void *param)
 
 static void hide_tree(obs_source_t parent, obs_source_t child, void *param)
 {
-	if (--child->show_refs == 0)
+	if (os_atomic_dec_long(&child->show_refs) == 0)
 		hide_source(child);
 
 	UNUSED_PARAMETER(parent);
@@ -419,13 +420,13 @@ void obs_source_activate(obs_source_t source, enum view_type type)
 {
 	if (!source) return;
 
-	if (++source->show_refs == 1) {
+	if (os_atomic_inc_long(&source->show_refs) == 1) {
 		show_source(source);
 		obs_source_enum_tree(source, show_tree, NULL);
 	}
 
 	if (type == MAIN_VIEW) {
-		if (++source->activate_refs == 1) {
+		if (os_atomic_inc_long(&source->activate_refs) == 1) {
 			activate_source(source);
 			obs_source_enum_tree(source, activate_tree, NULL);
 			obs_source_set_present_volume(source, 1.0f);
@@ -437,13 +438,13 @@ void obs_source_deactivate(obs_source_t source, enum view_type type)
 {
 	if (!source) return;
 
-	if (--source->show_refs == 0) {
+	if (os_atomic_dec_long(&source->show_refs) == 0) {
 		hide_source(source);
 		obs_source_enum_tree(source, hide_tree, NULL);
 	}
 
 	if (type == MAIN_VIEW) {
-		if (--source->activate_refs == 0) {
+		if (os_atomic_dec_long(&source->activate_refs) == 0) {
 			deactivate_source(source);
 			obs_source_enum_tree(source, deactivate_tree, NULL);
 			obs_source_set_present_volume(source, 0.0f);
@@ -496,7 +497,7 @@ static inline void handle_ts_jump(obs_source_t source, uint64_t expected,
 
 	/* if has video, ignore audio data until reset */
 	if (source->info.output_flags & OBS_SOURCE_ASYNC_VIDEO)
-		source->audio_reset_ref--;
+		os_atomic_dec_long(&source->audio_reset_ref);
 	else 
 		reset_audio_timing(source, ts);
 }
@@ -1384,12 +1385,12 @@ static void enum_source_tree_callback(obs_source_t parent, obs_source_t child,
 	struct source_enum_data *data = param;
 
 	if (child->info.enum_sources && !child->enum_refs) {
-		child->enum_refs++;
+		os_atomic_inc_long(&child->enum_refs);
 
 		child->info.enum_sources(child->data,
 				enum_source_tree_callback, data);
 
-		child->enum_refs--;
+		os_atomic_dec_long(&child->enum_refs);
 	}
 
 	data->enum_callback(parent, child, data->param);
@@ -1404,9 +1405,9 @@ void obs_source_enum_sources(obs_source_t source,
 
 	obs_source_addref(source);
 
-	source->enum_refs++;
+	os_atomic_inc_long(&source->enum_refs);
 	source->info.enum_sources(source->data, enum_callback, param);
-	source->enum_refs--;
+	os_atomic_dec_long(&source->enum_refs);
 
 	obs_source_release(source);
 }
@@ -1422,10 +1423,10 @@ void obs_source_enum_tree(obs_source_t source,
 
 	obs_source_addref(source);
 
-	source->enum_refs++;
+	os_atomic_inc_long(&source->enum_refs);
 	source->info.enum_sources(source->data, enum_source_tree_callback,
 			&data);
-	source->enum_refs--;
+	os_atomic_dec_long(&source->enum_refs);
 
 	obs_source_release(source);
 }

libobs/util/platform-nix.c

@@ -116,13 +116,3 @@ int os_mkdir(const char *path)
 
 	return (errno == EEXIST) ? MKDIR_EXISTS : MKDIR_ERROR;
 }
-
-long atomic_inc_long(volatile long *val)
-{
-	return __sync_fetch_and_add(val, 1);
-}
-
-long atomic_dec_long(volatile long *val)
-{
-	return __sync_fetch_and_sub(val, 1);
-}

libobs/util/platform-windows.c

@@ -185,16 +185,6 @@ int os_mkdir(const char *path)
 	return MKDIR_SUCCESS;
 }
 
-long atomic_inc_long(volatile long *val)
-{
-	return InterlockedIncrement(val);
-}
-
-long atomic_dec_long(volatile long *val)
-{
-	return InterlockedDecrement(val);
-}
-
 
 BOOL WINAPI DllMain(HINSTANCE hinst_dll, DWORD reason, LPVOID reserved)
 {

libobs/util/platform.h

@@ -76,9 +76,6 @@ EXPORT char *os_get_config_path(const char *name);
 
 EXPORT bool os_file_exists(const char *path);
 
-EXPORT long atomic_inc_long(volatile long *val);
-EXPORT long atomic_dec_long(volatile long *val);
-
 #define MKDIR_EXISTS   1
 #define MKDIR_SUCCESS  0
 #define MKDIR_ERROR   -1

libobs/util/threading-posix.c

@@ -235,3 +235,13 @@ int  os_sem_wait(os_sem_t sem)
 }
 
 #endif
+
+long os_atomic_inc_long(volatile long *val)
+{
+	return __sync_fetch_and_add(val, 1);
+}
+
+long os_atomic_dec_long(volatile long *val)
+{
+	return __sync_fetch_and_sub(val, 1);
+}

libobs/util/threading-windows.c

@@ -150,3 +150,13 @@ int  os_sem_wait(os_sem_t sem)
 	ret = WaitForSingleObject(sem->handle, INFINITE);
 	return (ret == WAIT_OBJECT_0) ? 0 : -1;
 }
+
+long os_atomic_inc_long(volatile long *val)
+{
+	return InterlockedIncrement(val);
+}
+
+long os_atomic_dec_long(volatile long *val)
+{
+	return InterlockedDecrement(val);
+}

libobs/util/threading.h

@@ -67,6 +67,9 @@ EXPORT void os_sem_destroy(os_sem_t sem);
 EXPORT int  os_sem_post(os_sem_t sem);
 EXPORT int  os_sem_wait(os_sem_t sem);
 
+EXPORT long os_atomic_inc_long(volatile long *val);
+EXPORT long os_atomic_dec_long(volatile long *val);
+
 
 #ifdef __cplusplus
 }

plugins/win-capture/dc-capture.c

@@ -5,7 +5,7 @@
 
 static inline void init_textures(struct dc_capture *capture)
 {
-	for (size_t i = 0; i < capture->num_textures; i++) {
+	for (int i = 0; i < capture->num_textures; i++) {
 		if (capture->compatibility)
 			capture->textures[i] = gs_create_texture(
 					capture->width, capture->height,
@@ -28,6 +28,8 @@ void dc_capture_init(struct dc_capture *capture, int x, int y,
 		uint32_t width, uint32_t height, bool cursor,
 		bool compatibility)
 {
+	memset(capture, 0, sizeof(struct dc_capture));
+
 	capture->x              = x;
 	capture->y              = y;
 	capture->width          = width;
@@ -76,7 +78,7 @@ void dc_capture_free(struct dc_capture *capture)
 
 	gs_entercontext(obs_graphics());
 
-	for (size_t i = 0; i < capture->num_textures; i++)
+	for (int i = 0; i < capture->num_textures; i++)
 		texture_destroy(capture->textures[i]);
 
 	gs_leavecontext();