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	global: add registering signal
Add a new signal that can be used to register child objects
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					 2 changed files with 45 additions and 26 deletions
				
			
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			@ -29,8 +29,9 @@
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#include <pipewire/global.h>
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/** \cond */
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struct global_impl {
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struct impl {
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	struct pw_global this;
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	bool registered;
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};
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/** \endcond */
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			@ -64,10 +65,10 @@ pw_global_new(struct pw_core *core,
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	      struct pw_properties *properties,
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	      void *object)
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{
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	struct global_impl *impl;
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	struct impl *impl;
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	struct pw_global *this;
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	impl = calloc(1, sizeof(struct global_impl));
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	impl = calloc(1, sizeof(struct impl));
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	if (impl == NULL)
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		return NULL;
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			@ -78,12 +79,13 @@ pw_global_new(struct pw_core *core,
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	this->version = version;
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	this->object = object;
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	this->properties = properties;
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	this->id = SPA_ID_INVALID;
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	this->id = pw_map_insert_new(&core->globals, this);
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	spa_hook_list_init(&this->listener_list);
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	pw_log_debug("global %p: new %s", this,
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			spa_type_map_get_type(core->type.map, this->type));
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	pw_log_debug("global %p: new %s %d", this,
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			spa_type_map_get_type(core->type.map, this->type),
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			this->id);
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	return this;
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}
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			@ -102,6 +104,7 @@ pw_global_register(struct pw_global *global,
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		   struct pw_client *owner,
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		   struct pw_global *parent)
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{
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	struct impl *impl = SPA_CONTAINER_OF(global, struct impl, this);
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	struct pw_resource *registry;
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	struct pw_core *core = global->core;
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			@ -114,12 +117,8 @@ pw_global_register(struct pw_global *global,
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		parent = global;
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	global->parent = parent;
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	global->id = pw_map_insert_new(&core->globals, global);
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	spa_list_append(&core->global_list, &global->link);
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	pw_log_debug("global %p: add %u owner %p parent %p", global, global->id, owner, parent);
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	spa_hook_list_call(&core->listener_list, struct pw_core_events, global_added, global);
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	impl->registered = true;
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	spa_list_for_each(registry, &core->registry_resource_list, link) {
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		uint32_t permissions = pw_global_get_permissions(global, registry->client);
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			@ -134,6 +133,37 @@ pw_global_register(struct pw_global *global,
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						    global->properties ?
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						        &global->properties->dict : NULL);
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	}
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	spa_hook_list_call(&global->listener_list, struct pw_global_events, registering);
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	pw_log_debug("global %p: add %u owner %p parent %p", global, global->id, owner, parent);
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	spa_hook_list_call(&core->listener_list, struct pw_core_events, global_added, global);
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	return 0;
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}
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static int global_unregister(struct pw_global *global)
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{
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	struct impl *impl = SPA_CONTAINER_OF(global, struct impl, this);
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	struct pw_core *core = global->core;
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	struct pw_resource *registry;
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	if (!impl->registered)
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		return 0;
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	spa_list_for_each(registry, &core->registry_resource_list, link) {
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		uint32_t permissions = pw_global_get_permissions(global, registry->client);
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		pw_log_debug("registry %p: global %d %08x", registry, global->id, permissions);
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		if (PW_PERM_IS_R(permissions))
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			pw_registry_resource_global_remove(registry, global->id);
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	}
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	spa_list_remove(&global->link);
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	spa_hook_list_call(&core->listener_list, struct pw_core_events,
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			global_removed, global);
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	impl->registered = false;
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	return 0;
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}
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			@ -230,25 +260,14 @@ pw_global_bind(struct pw_global *global, struct pw_client *client, uint32_t perm
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void pw_global_destroy(struct pw_global *global)
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{
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	struct pw_core *core = global->core;
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	struct pw_resource *registry;
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	global_unregister(global);
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	pw_log_debug("global %p: destroy %u", global, global->id);
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	spa_hook_list_call(&global->listener_list, struct pw_global_events, destroy);
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	if (global->id != SPA_ID_INVALID) {
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		spa_list_for_each(registry, &core->registry_resource_list, link) {
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			uint32_t permissions = pw_global_get_permissions(global, registry->client);
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			pw_log_debug("registry %p: global %d %08x", registry, global->id, permissions);
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			if (PW_PERM_IS_R(permissions))
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				pw_registry_resource_global_remove(registry, global->id);
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		}
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	pw_map_remove(&core->globals, global->id);
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		spa_list_remove(&global->link);
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		spa_hook_list_call(&core->listener_list, struct pw_core_events, global_removed, global);
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	}
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	pw_log_debug("global %p: free", global);
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	spa_hook_list_call(&global->listener_list, struct pw_global_events, free);
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			@ -60,9 +60,9 @@ struct pw_global_events {
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#define PW_VERSION_GLOBAL_EVENTS 0
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	uint32_t version;
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	void (*registering) (void *data);
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	/** The global is destroyed */
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	void (*destroy) (void *data);
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	/** The global is freed */
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	void (*free) (void *data);
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