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Split the global registry into its own wl_registry object

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The only way to make the global object listener interface thread safe is to
make it its own interface and make different listeners different wl_proxies.
The core of the problem is the callback we do when a global show up or
disappears, which we can't do with a lock held.  On the other hand we can't
iterate the global list or the listener list without a lock held as new
globals or listeners may come and go during the iteration.

Making a copy of the list under the lock and then iterating after dropping
the lock wont work either.  In case of the listener list, once we drop the
lock another thread may unregister a listener and destroy the callbackk
data, which means that when we eventually call that listener we'll pass it
free memory and break everything.

We did already solve the thread-safe callback problem, however.  It's what
we do for all protocol events.  So we can just make the global registry
functionality its own new interface and give each thread its own proxy.
That way, the thread will do its own callbacks (with no locks held) and
destroy the proxy when it's no longer interested in wl_registry events.
This commit is contained in:
Kristian Høgsberg 2012-10-08 13:53:47 -04:00
parent 8872956dfd
commit 9fe75537ad
4 changed files with 72 additions and 162 deletions
Download patch file Download diff file Expand all files Collapse all files

110
src/wayland-client.c
View file

@ -42,12 +42,6 @@
#include "wayland-client.h"
#include "wayland-private.h"
struct wl_global_listener {
wl_display_global_func_t handler;
void *data;
struct wl_list link;
};
struct wl_proxy {
struct wl_object object;
struct wl_display *display;
@ -75,13 +69,8 @@ struct wl_display {
int close_fd;
pthread_t display_thread;
struct wl_map objects;
struct wl_list global_listener_list;
struct wl_list global_list;
struct wl_event_queue queue;
pthread_mutex_t mutex;
wl_display_global_func_t global_handler;
void *global_handler_data;
};
static int wl_debug = 0;
@ -128,36 +117,6 @@ wl_display_create_queue(struct wl_display *display)
return queue;
}
WL_EXPORT struct wl_global_listener *
wl_display_add_global_listener(struct wl_display *display,
wl_display_global_func_t handler, void *data)
{
struct wl_global_listener *listener;
struct wl_global *global;
listener = malloc(sizeof *listener);
if (listener == NULL)
return NULL;
listener->handler = handler;
listener->data = data;
wl_list_insert(display->global_listener_list.prev, &listener->link);
wl_list_for_each(global, &display->global_list, link)
(*listener->handler)(display, global->id, global->interface,
global->version, listener->data);
return listener;
}
WL_EXPORT void
wl_display_remove_global_listener(struct wl_display *display,
struct wl_global_listener *listener)
{
wl_list_remove(&listener->link);
free(listener);
}
WL_EXPORT struct wl_proxy *
wl_proxy_create(struct wl_proxy *factory, const struct wl_interface *interface)
{
@ -272,22 +231,6 @@ wl_proxy_marshal(struct wl_proxy *proxy, uint32_t opcode, ...)
pthread_mutex_unlock(&proxy->display->mutex);
}
/* Can't do this, there may be more than one instance of an
* interface... */
WL_EXPORT uint32_t
wl_display_get_global(struct wl_display *display,
const char *interface, uint32_t version)
{
struct wl_global *global;
wl_list_for_each(global, &display->global_list, link)
if (strcmp(interface, global->interface) == 0 &&
version <= global->version)
return global->id;
return 0;
}
static void
display_handle_error(void *data,
struct wl_display *display, struct wl_object *object,
@ -298,46 +241,6 @@ display_handle_error(void *data,
abort();
}
static void
display_handle_global(void *data,
struct wl_display *display,
uint32_t id, const char *interface, uint32_t version)
{
struct wl_global_listener *listener;
struct wl_global *global;
global = malloc(sizeof *global);
global->id = id;
global->interface = strdup(interface);
global->version = version;
wl_list_insert(display->global_list.prev, &global->link);
wl_list_for_each(listener, &display->global_listener_list, link)
(*listener->handler)(display,
id, interface, version, listener->data);
}
static void
wl_global_destroy(struct wl_global *global)
{
wl_list_remove(&global->link);
free(global->interface);
free(global);
}
static void
display_handle_global_remove(void *data,
struct wl_display *display, uint32_t id)
{
struct wl_global *global;
wl_list_for_each(global, &display->global_list, link)
if (global->id == id) {
wl_global_destroy(global);
break;
}
}
static void
display_handle_delete_id(void *data, struct wl_display *display, uint32_t id)
{
@ -356,8 +259,6 @@ display_handle_delete_id(void *data, struct wl_display *display, uint32_t id)
static const struct wl_display_listener display_listener = {
display_handle_error,
display_handle_global,
display_handle_global_remove,
display_handle_delete_id
};
@ -435,8 +336,6 @@ wl_display_connect_to_fd(int fd)
display->fd = fd;
wl_map_init(&display->objects);
wl_list_init(&display->global_listener_list);
wl_list_init(&display->global_list);
wl_event_queue_init(&display->queue);
wl_map_insert_new(&display->objects, WL_MAP_CLIENT_SIDE, NULL);
@ -494,18 +393,9 @@ wl_display_connect(const char *name)
WL_EXPORT void
wl_display_disconnect(struct wl_display *display)
{
struct wl_global *global, *gnext;
struct wl_global_listener *listener, *lnext;
wl_connection_destroy(display->connection);
wl_map_release(&display->objects);
wl_event_queue_release(&display->queue);
wl_list_for_each_safe(global, gnext,
&display->global_list, link)
wl_global_destroy(global);
wl_list_for_each_safe(listener, lnext,
&display->global_listener_list, link)
free(listener);
if (display->close_fd)
close(display->fd);