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loop: handle remove while dispatching better

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Keep the array of dispatched sources around in the loop. When a source
is removed while dispatching, set the data to NULL so that we don't try
to deref the source again or call its function.

Fixes #2114
This commit is contained in:
Wim Taymans 2022-02-08 10:09:06 +01:00
parent afc88a12e5
commit 45d911641b
1 changed files with 16 additions and 5 deletions
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21
spa/plugins/support/loop.c
View file

@ -48,6 +48,7 @@ static struct spa_log_topic log_topic = SPA_LOG_TOPIC(0, "spa.loop");
#define MAX_ALIGN 8
#define ITEM_ALIGN 8
#define DATAS_SIZE (4096*8)
#define MAX_EP 32
/** \cond */
@ -80,6 +81,9 @@ struct impl {
int poll_fd;
pthread_t thread;
struct spa_poll_event dispatching[MAX_EP];
uint32_t n_dispatching;
struct spa_source *wakeup;
int ack_fd;
@ -125,6 +129,11 @@ static int loop_update_source(void *object, struct spa_source *source)
static int loop_remove_source(void *object, struct spa_source *source)
{
struct impl *impl = object;
uint32_t i;
for (i = 0; i < impl->n_dispatching; i++) {
if (impl->dispatching[i].data == source)
impl->dispatching[i].data = NULL;
}
source->loop = NULL;
return spa_system_pollfd_del(impl->system, impl->poll_fd, source->fd);
}
@ -311,13 +320,12 @@ static inline void process_destroy(struct impl *impl)
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_poll_event *ep = impl->dispatching;
int i, nfds;
spa_loop_control_hook_before(&impl->hooks_list);
nfds = spa_system_pollfd_wait(impl->system, impl->poll_fd, ep, SPA_N_ELEMENTS(ep), timeout);
nfds = spa_system_pollfd_wait(impl->system, impl->poll_fd, ep, MAX_EP, timeout);
spa_loop_control_hook_after(&impl->hooks_list);
@ -329,16 +337,19 @@ static int loop_iterate(void *object, int timeout)
* can then reset the rmask to suppress the callback */
for (i = 0; i < nfds; i++) {
struct spa_source *s = ep[i].data;
s->rmask = ep[i].events;
if (SPA_LIKELY(s))
s->rmask = ep[i].events;
}
impl->n_dispatching = nfds;
for (i = 0; i < nfds; i++) {
struct spa_source *s = ep[i].data;
if (SPA_LIKELY(s->rmask && s->fd != -1 && s->loop == loop))
if (SPA_LIKELY(s && s->rmask))
s->func(s);
}
if (SPA_UNLIKELY(!spa_list_is_empty(&impl->destroy_list)))
process_destroy(impl);
impl->n_dispatching = 0;
return nfds;
}