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loop: don't usleep when queue is full

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When the queue is full, before this patch we used to go into usleep in
the hope that the other thread will run and empty the queue and that we
can retry after the usleep.

This however does not always work because the other thread might be waiting
for the thread that does the invoke call and we lock forever.

Therefore we should always try to make progress in some way. Instead of
waiting, allocate an (or use the previously allocated) overflow queue and
write to that one. We can chain multiple overflow queues together as many
as we need (but we might want to bound that as well).

The loop.retry-timeout property is now deprecated.

See #4114
This commit is contained in:
Wim Taymans 2024-08-06 12:05:11 +02:00
parent 5fed160972
commit 2f3276f6bb
2 changed files with 70 additions and 61 deletions
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5
src/pipewire/keys.h
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@ -74,9 +74,6 @@ extern "C" {
#define PW_KEY_LOOP_CLASS "loop.class" /**< the classes this loop handles, array of strings */
#define PW_KEY_LOOP_RT_PRIO "loop.rt-prio" /**< realtime priority of the loop */
#define PW_KEY_LOOP_CANCEL "loop.cancel" /**< if the loop can be canceled */
#define PW_KEY_LOOP_RETRY_TIMEOUT "loop.retry-timeout" /**< when the loop invoke queue is full, the timeout
* in microseconds before retrying.
* default = 1 second, 0 = disable */
/* context */
#define PW_KEY_CONTEXT_PROFILE_MODULES "context.profile.modules" /**< a context profile for modules, deprecated */
@ -368,9 +365,11 @@ extern "C" {
# ifdef PW_ENABLE_DEPRECATED
# define PW_KEY_PRIORITY_MASTER "priority.master" /**< deprecated, use priority.driver */
# define PW_KEY_NODE_TARGET "node.target" /**< deprecated since 0.3.64, use target.object. */
# define PW_KEY_LOOP_RETRY_TIMEOUT "loop.retry-timeout" /**< deprecated since 1.3.0 */
# else
# define PW_KEY_PRIORITY_MASTER PW_DEPRECATED("priority.master")
# define PW_KEY_NODE_TARGET PW_DEPRECATED("node.target")
# define PW_KEY_LOOP_RETRY_TIMEOUT PW_DEPRECATED("loop.retry-timeout")
# endif /* PW_ENABLE_DEPRECATED */
#endif /* PW_REMOVE_DEPRECATED */