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thread_loop: add more accurate timed_wait

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Add get_time() to calculate a timespec timeout value.
Add timed_wait_full() to wait for a timespec
This commit is contained in:
Wim Taymans 2020-07-14 17:13:59 +02:00
parent 36511a5d8e
commit a6d221f18a
2 changed files with 54 additions and 5 deletions
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58
src/pipewire/thread-loop.c
View file

@ -366,7 +366,7 @@ void pw_thread_loop_wait(struct pw_thread_loop *loop)
*
* \param loop a \ref pw_thread_loop to signal
* \param wait_max_sec the maximum number of seconds to wait for a \ref pw_thread_loop_signal()
* \return 0 on success or ETIMEDOUT on timeout
* \return 0 on success or ETIMEDOUT on timeout or a negative errno value.
*
* \memberof pw_thread_loop
*/
@ -375,15 +375,55 @@ int pw_thread_loop_timed_wait(struct pw_thread_loop *loop, int wait_max_sec)
{
struct timespec timeout;
int ret = 0;
clock_gettime(CLOCK_REALTIME, &timeout);
timeout.tv_sec += wait_max_sec;
loop->n_waiting++;
ret = pthread_cond_timedwait(&loop->cond, &loop->lock, &timeout);
loop->n_waiting--;
if ((ret = pw_thread_loop_get_time(loop,
&timeout, wait_max_sec * SPA_NSEC_PER_SEC)) < 0)
return ret;
ret = pw_thread_loop_timed_wait_full(loop, &timeout);
return ret == -ETIMEDOUT ? ETIMEDOUT : ret;
}
/** Get the current time of the loop + timeout. This can be used in
* pw_thread_loop_timed_wait_full().
*
* \param loop a \ref pw_thread_loop
* \param abstime the result struct timesspec
* \param timeout the time in nanoseconds to add to \a tp
* \return 0 on success or a negative errno value on error.
*
* \memberof pw_thread_loop
*/
SPA_EXPORT
int pw_thread_loop_get_time(struct pw_thread_loop *loop, struct timespec *abstime, int64_t timeout)
{
if (clock_gettime(CLOCK_REALTIME, abstime) < 0)
return -errno;
abstime->tv_sec += timeout / SPA_NSEC_PER_SEC;
abstime->tv_nsec += timeout % SPA_NSEC_PER_SEC;
if (abstime->tv_nsec >= SPA_NSEC_PER_SEC) {
abstime->tv_sec++;
abstime->tv_nsec -= SPA_NSEC_PER_SEC;
}
return 0;
}
/** Wait for the loop thread to call \ref pw_thread_loop_signal()
* or time out.
*
* \param loop a \ref pw_thread_loop to signal
* \param abstime the absolute time to wait for a \ref pw_thread_loop_signal()
* \return 0 on success or -ETIMEDOUT on timeout or a negative error value
*
* \memberof pw_thread_loop
*/
SPA_EXPORT
int pw_thread_loop_timed_wait_full(struct pw_thread_loop *loop, struct timespec *abstime)
{
int ret;
loop->n_waiting++;
ret = pthread_cond_timedwait(&loop->cond, &loop->lock, abstime);
loop->n_waiting--;
return -ret;
}
/** Signal the loop thread waiting for accept with \ref pw_thread_loop_signal()

9
src/pipewire/thread-loop.h
View file

@ -143,6 +143,15 @@ void pw_thread_loop_wait(struct pw_thread_loop *loop);
* until some thread calls \ref pw_thread_loop_signal or time out */
int pw_thread_loop_timed_wait(struct pw_thread_loop *loop, int wait_max_sec);
/** Get a struct timespec suitable for \ref pw_thread_loop_timed_wait_full.
* Since: 0.3.7 */
int pw_thread_loop_get_time(struct pw_thread_loop *loop, struct timespec *abstime, int64_t timeout);
/** Release the lock and wait until \a timeout until some thread calls
* \ref pw_thread_loop_signal. Use \ref pw_thread_loop_get_time to make a timeout.
* Since: 0.3.7 */
int pw_thread_loop_timed_wait_full(struct pw_thread_loop *loop, struct timespec *abstime);
/** Signal all threads waiting with \ref pw_thread_loop_wait */
void pw_thread_loop_signal(struct pw_thread_loop *loop, bool wait_for_accept);