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handle read from timerfd correctly

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When reading the timerfd gives an error, we should return right away
because the timeout did not happen.

If we change the timerfd timeout before reading it, we can get -EAGAIN.
Don't log an error in that case but wait for the new timeout.
This commit is contained in:
Wim Taymans 2022-12-09 17:30:31 +01:00
parent 3a443b4e1c
commit f44d55f6c2
14 changed files with 153 additions and 55 deletions
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14
spa/plugins/test/fakesrc.c
View file

@ -233,12 +233,17 @@ static void set_timer(struct impl *this, bool enabled)
static inline void read_timer(struct impl *this)
{
uint64_t expirations;
int res = 0;
if (this->callbacks.funcs || this->props.live) {
if (spa_system_timerfd_read(this->data_system,
this->timer_source.fd, &expirations) < 0)
perror("read timerfd");
if ((res = spa_system_timerfd_read(this->data_system,
this->timer_source.fd, &expirations)) < 0) {
if (res != -EAGAIN)
spa_log_error(this->log, NAME " %p: timerfd error: %s",
this, spa_strerror(res));
}
}
return res;
}
static int make_buffer(struct impl *this)
@ -248,7 +253,8 @@ static int make_buffer(struct impl *this)
struct spa_io_buffers *io = port->io;
int n_bytes;
read_timer(this);
if (read_timer(this) < 0)
return 0;
if (spa_list_is_empty(&port->empty)) {
set_timer(this, false);