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thread-loop: add some additional check

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Check for errors from pthread_ functions and log an error.
Check the recursion count to check if locks were correctly taken.
This commit is contained in:
Wim Taymans 2023-04-04 11:34:03 +02:00
parent 796a0d2cfe
commit aa2ea737c7
1 changed files with 45 additions and 10 deletions
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55
src/pipewire/thread-loop.c
View file

@ -32,6 +32,7 @@ struct pw_thread_loop {
pthread_cond_t accept_cond;
pthread_t thread;
int recurse;
struct spa_hook hook;
@ -44,16 +45,38 @@ struct pw_thread_loop {
};
/** \endcond */
static int do_lock(struct pw_thread_loop *this)
{
int res;
if ((res = pthread_mutex_lock(&this->lock)) != 0)
pw_log_error("%p: thread:%lu: %s", this, pthread_self(), strerror(res));
else
this->recurse++;
return -res;
}
static int do_unlock(struct pw_thread_loop *this)
{
int res;
spa_return_val_if_fail(this->recurse > 0, -EIO);
this->recurse--;
if ((res = pthread_mutex_unlock(&this->lock)) != 0)
pw_log_error("%p: thread:%lu: %s", this, pthread_self(), strerror(res));
else
this->recurse++;
return -res;
}
static void impl_before(void *data)
{
struct pw_thread_loop *this = data;
pthread_mutex_unlock(&this->lock);
do_unlock(this);
}
static void impl_after(void *data)
{
struct pw_thread_loop *this = data;
pthread_mutex_lock(&this->lock);
do_lock(this);
}
static const struct spa_loop_control_hooks impl_hooks = {
@ -225,7 +248,7 @@ static void *do_loop(void *user_data)
struct pw_thread_loop *this = user_data;
int res;
pthread_mutex_lock(&this->lock);
do_lock(this);
pw_log_debug("%p: enter thread", this);
pw_loop_enter(this->loop);
@ -239,7 +262,7 @@ static void *do_loop(void *user_data)
}
pw_log_debug("%p: leave thread", this);
pw_loop_leave(this->loop);
pthread_mutex_unlock(&this->lock);
do_unlock(this);
return NULL;
}
@ -306,7 +329,7 @@ void pw_thread_loop_stop(struct pw_thread_loop *loop)
SPA_EXPORT
void pw_thread_loop_lock(struct pw_thread_loop *loop)
{
pthread_mutex_lock(&loop->lock);
do_lock(loop);
pw_log_trace("%p", loop);
}
@ -319,7 +342,7 @@ SPA_EXPORT
void pw_thread_loop_unlock(struct pw_thread_loop *loop)
{
pw_log_trace("%p", loop);
pthread_mutex_unlock(&loop->lock);
do_unlock(loop);
}
/** Signal the thread
@ -342,8 +365,11 @@ void pw_thread_loop_signal(struct pw_thread_loop *loop, bool wait_for_accept)
if (wait_for_accept) {
loop->n_waiting_for_accept++;
while (loop->n_waiting_for_accept > 0)
pthread_cond_wait(&loop->accept_cond, &loop->lock);
while (loop->n_waiting_for_accept > 0) {
int res;
if ((res = pthread_cond_wait(&loop->accept_cond, &loop->lock)) != 0)
pw_log_error("%p: thread:%lu: %s", loop, pthread_self(), strerror(res));
}
}
}
@ -355,9 +381,15 @@ void pw_thread_loop_signal(struct pw_thread_loop *loop, bool wait_for_accept)
SPA_EXPORT
void pw_thread_loop_wait(struct pw_thread_loop *loop)
{
pw_log_trace("%p, waiting %d", loop, loop->n_waiting);
int res;
pw_log_trace("%p, waiting:%d recurse:%d", loop, loop->n_waiting, loop->recurse);
spa_return_if_fail(loop->recurse > 0);
loop->n_waiting++;
pthread_cond_wait(&loop->cond, &loop->lock);
loop->recurse--;
if ((res = pthread_cond_wait(&loop->cond, &loop->lock)) != 0)
pw_log_error("%p: thread:%lu: %s", loop, pthread_self(), strerror(res));
loop->recurse++;
loop->n_waiting--;
pw_log_trace("%p, waiting done %d", loop, loop->n_waiting);
}
@ -418,8 +450,11 @@ SPA_EXPORT
int pw_thread_loop_timed_wait_full(struct pw_thread_loop *loop, const struct timespec *abstime)
{
int ret;
spa_return_val_if_fail(loop->recurse > 0, -EIO);
loop->n_waiting++;
loop->recurse--;
ret = pthread_cond_timedwait(&loop->cond, &loop->lock, abstime);
loop->recurse++;
loop->n_waiting--;
return -ret;
}