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context: hash the globals by id

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Store the globals by id in a hashtable. O(1) insert and remove.
It moves the find_global overhead from the top of the list to somewhere
in the middle for the jack-stress test.
This commit is contained in:
Wim Taymans 2022-01-14 13:19:31 +01:00
parent 6394537dbd
commit 80b2e345d7
2 changed files with 13 additions and 2 deletions
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12
src/pipewire/context.c
View file

@ -198,6 +198,7 @@ struct pw_context *pw_context_new(struct pw_loop *main_loop,
struct pw_properties *pr, *conf;
struct spa_cpu *cpu;
int res = 0;
struct spa_list *m;
impl = calloc(1, sizeof(struct impl) + user_data_size);
if (impl == NULL) {
@ -215,6 +216,9 @@ struct pw_context *pw_context_new(struct pw_loop *main_loop,
pw_array_init(&this->factory_lib, 32);
pw_array_init(&this->objects, 32);
SPA_FOR_EACH_ELEMENT(this->global_map, m)
spa_list_init(m);
spa_list_init(&this->core_impl_list);
spa_list_init(&this->protocol_list);
spa_list_init(&this->core_list);
@ -479,7 +483,6 @@ void pw_context_destroy(struct pw_context *context)
free(entry->lib);
}
pw_array_clear(&context->factory_lib);
pw_array_clear(&context->objects);
spa_hook_list_clean(&context->listener_list);
@ -584,7 +587,10 @@ int pw_context_for_each_global(struct pw_context *context,
static struct pw_global *find_global(struct pw_context *context, uint32_t id)
{
struct pw_global *g;
spa_list_for_each(g, &context->global_list, link) {
struct spa_list *l;
l = &context->global_map[id % GLOBAL_HASH_SIZE];
spa_list_for_each(g, l, map_link) {
if (g->id == id)
return g;
}
@ -618,6 +624,7 @@ uint32_t pw_context_add_global(struct pw_context *context, struct pw_global *glo
global->id = context->serial;
context->serial = (context->serial+1) & PW_ID_MASK;
spa_list_prepend(&context->global_map[global->id % GLOBAL_HASH_SIZE], &global->map_link);
spa_list_append(&context->sorted_globals, &global->sorted_link);
spa_list_append(&context->global_list, &global->link);
return global->id;
@ -627,6 +634,7 @@ void pw_context_remove_global(struct pw_context *context, struct pw_global *glob
{
spa_list_remove(&global->link);
spa_list_remove(&global->sorted_link);
spa_list_remove(&global->map_link);
}
SPA_EXPORT

3
src/pipewire/private.h
View file

@ -321,6 +321,7 @@ struct pw_global {
struct spa_list link; /**< link in context list of globals */
struct spa_list sorted_link; /**< link in context list of sorted_globals */
struct spa_list map_link; /**< link in context list of global_map */
uint32_t id; /**< server id of the object */
struct pw_properties *properties; /**< properties of the global */
@ -452,6 +453,8 @@ struct pw_context {
struct pw_array factory_lib; /**< mapping of factory_name regexp to library */
uint32_t serial;
#define GLOBAL_HASH_SIZE 127
struct spa_list global_map[GLOBAL_HASH_SIZE];
struct spa_list sorted_globals;
struct pw_array objects; /**< objects */