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loop: simplify before and after events

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Because the signal can't be removed from the callback we can
simply iterate backwards and then forwards.

The first added hook (the unlock/lock pair) is called last before
going into the poll and first when leaving. This executes all other
callbacks inside a locked situation. And removing them with the lock
is not going to cause problems.
This commit is contained in:
Wim Taymans 2020-09-16 13:20:19 +02:00
parent 854d019343
commit e5f7e040dc
3 changed files with 28 additions and 16 deletions
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15
spa/plugins/support/loop.c
View file

@ -278,24 +278,13 @@ static int loop_iterate(void *object, int timeout)
struct impl *impl = object;
struct spa_loop *loop = &impl->loop;
struct spa_poll_event ep[32];
struct spa_list save;
struct spa_hook *hook;
int i, nfds;
spa_list_init(&save);
spa_list_consume(hook, &impl->hooks_list.list, link) {
spa_list_remove(&hook->link);
spa_list_prepend(&save, &hook->link);
spa_callbacks_call(&hook->cb, struct spa_loop_control_hooks, before, 0);
}
spa_loop_control_hook_before(&impl->hooks_list);
nfds = spa_system_pollfd_wait(impl->system, impl->poll_fd, ep, SPA_N_ELEMENTS(ep), timeout);
spa_list_consume(hook, &save, link) {
spa_list_remove(&hook->link);
spa_list_append(&impl->hooks_list.list, &hook->link);
spa_callbacks_call(&hook->cb, struct spa_loop_control_hooks, after, 0);
}
spa_loop_control_hook_after(&impl->hooks_list);
if (SPA_UNLIKELY(nfds < 0))
return nfds;