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module-rt: use lock for thread lookup and invoke

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We should only call invoke from one thread at a time so fuse the
gettid of the thread and invoke into the lock.

See #3357
This commit is contained in:
Wim Taymans 2023-07-20 15:39:08 +02:00
parent 47f7802c2e
commit 7b24b3b687
1 changed files with 13 additions and 17 deletions
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30
src/modules/module-rt.c
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@ -786,21 +786,6 @@ static int impl_get_rt_range(void *object, const struct spa_dict *props,
return res;
}
static pid_t impl_gettid(struct impl *impl, pthread_t pt)
{
struct thread *thr;
pid_t pid;
pthread_mutex_lock(&impl->lock);
if ((thr = find_thread_by_pt(impl, pt)) != NULL)
pid = thr->pid;
else
pid = _gettid();
pthread_mutex_unlock(&impl->lock);
return pid;
}
struct rt_params {
pid_t pid;
int priority;
@ -839,6 +824,7 @@ static int impl_acquire_rt(void *object, struct spa_thread *thread, int priority
struct impl *impl = object;
struct sched_param sp;
pthread_t pt = (pthread_t)thread;
int res;
/* See the docstring on `spa_thread_utils_methods::acquire_rt` */
if (priority == -1) {
@ -846,16 +832,26 @@ static int impl_acquire_rt(void *object, struct spa_thread *thread, int priority
}
if (impl->use_rtkit) {
struct rt_params params;
struct thread *thr;
spa_zero(sp);
if (pthread_setschedparam(pt, SCHED_OTHER | PW_SCHED_RESET_ON_FORK, &sp) == 0) {
pw_log_debug("SCHED_OTHER|SCHED_RESET_ON_FORK worked.");
}
params.pid = impl_gettid(impl, pt);
params.priority = priority;
return pw_loop_invoke(pw_thread_loop_get_loop(impl->thread_loop),
pthread_mutex_lock(&impl->lock);
if ((thr = find_thread_by_pt(impl, pt)) != NULL)
params.pid = thr->pid;
else
params.pid = _gettid();
res = pw_loop_invoke(pw_thread_loop_get_loop(impl->thread_loop),
do_make_realtime, 0, &params, sizeof(params), false, impl);
pthread_mutex_unlock(&impl->lock);
return res;
} else {
return acquire_rt_sched(thread, priority);
}