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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
Download patch file Download diff file Expand all files Collapse all files

21
spa/include/spa/support/loop.h
View file

@ -113,7 +113,9 @@ struct spa_loop_methods {
#define spa_loop_invoke(l,...) spa_loop_method(l,invoke,0,##__VA_ARGS__)
/** Control hooks */
/** Control hooks. These hooks can't be removed from their
* callbacks and must be removed from a safe place (when the loop
* is not running or when it is locked). */
struct spa_loop_control_hooks {
#define SPA_VERSION_LOOP_CONTROL_HOOKS 0
uint32_t version;
@ -125,8 +127,21 @@ struct spa_loop_control_hooks {
void (*after) (void *data);
};
#define spa_loop_control_hook_before(l) spa_hook_list_call_simple(l, struct spa_loop_control_hooks, before, 0)
#define spa_loop_control_hook_after(l) spa_hook_list_call_simple(l, struct spa_loop_control_hooks, after, 0)
#define spa_loop_control_hook_before(l) \
({ \
struct spa_hook_list *_l = l; \
struct spa_hook *_h; \
spa_list_for_each_reverse(_h, &_l->list, link) \
spa_callbacks_call(&_h->cb, struct spa_loop_control_hooks, before, 0); \
})
#define spa_loop_control_hook_after(l) \
({ \
struct spa_hook_list *_l = l; \
struct spa_hook *_h; \
spa_list_for_each(_h, &_l->list, link) \
spa_callbacks_call(&_h->cb, struct spa_loop_control_hooks, after, 0); \
})
/**
* Control an event loop

8
spa/include/spa/utils/list.h
View file

@ -98,9 +98,17 @@ static inline void spa_list_remove(struct spa_list *elem)
!spa_list_is_end(pos, head, member); \
pos = spa_list_next(pos, member))
#define spa_list_for_each_prev(pos, head, curr, member) \
for (pos = spa_list_last(curr, __typeof__(*pos), member); \
!spa_list_is_end(pos, head, member); \
pos = spa_list_prev(pos, member))
#define spa_list_for_each(pos, head, member) \
spa_list_for_each_next(pos, head, head, member)
#define spa_list_for_each_reverse(pos, head, member) \
spa_list_for_each_prev(pos, head, head, member)
#define spa_list_for_each_safe_next(pos, tmp, head, curr, member) \
for (pos = spa_list_first(curr, __typeof__(*pos), member); \
tmp = spa_list_next(pos, member), \

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;