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doc: tutorial3: remove done variable

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Use `pw_main_loop_quit()` alone, which should be enough
to cause `pw_main_loop_run()` to return. `pw_main_loop_run()`
only returns prematurely when there is an error, but since
there is no error handling in this example, that scenario
is ignored.
This commit is contained in:
Barnabás Pőcze 2022-07-21 00:24:46 +02:00 • committed by Wim Taymans
parent f61bb3aef5
commit 04e65a86a1
2 changed files with 9 additions and 17 deletions
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9
doc/tutorial3.c
View file

@ -10,13 +10,11 @@
static int roundtrip(struct pw_core *core, struct pw_main_loop *loop) static int roundtrip(struct pw_core *core, struct pw_main_loop *loop)
{ {
struct spa_hook core_listener; struct spa_hook core_listener;
int pending, done = 0; int pending;
void core_event_done(void *object, uint32_t id, int seq) { void core_event_done(void *object, uint32_t id, int seq) {
if (id == PW_ID_CORE && seq == pending) { if (id == PW_ID_CORE && seq == pending)
done = 1;
pw_main_loop_quit(loop); pw_main_loop_quit(loop);
} }
}
const struct pw_core_events core_events = { const struct pw_core_events core_events = {
PW_VERSION_CORE_EVENTS, PW_VERSION_CORE_EVENTS,
.done = core_event_done, .done = core_event_done,
@ -27,9 +25,8 @@ static int roundtrip(struct pw_core *core, struct pw_main_loop *loop)
pending = pw_core_sync(core, PW_ID_CORE, 0); pending = pw_core_sync(core, PW_ID_CORE, 0);
while (!done) {
pw_main_loop_run(loop); pw_main_loop_run(loop);
}
spa_hook_remove(&core_listener); spa_hook_remove(&core_listener);
return 0; return 0;
} }

13
doc/tutorial3.dox
View file

@ -26,23 +26,20 @@ object. We are only interested in the `done` event in this
tutorial. This is the event handler: tutorial. This is the event handler:
\code{.c} \code{.c}
int pending, done = 0; int pending;
void core_event_done(void *data, uint32_t id, int seq) { void core_event_done(void *data, uint32_t id, int seq) {
if (id == PW_ID_CORE && seq == pending) { if (id == PW_ID_CORE && seq == pending)
done = 1;
pw_main_loop_quit(loop); pw_main_loop_quit(loop);
} }
}
const struct pw_core_events core_events = { const struct pw_core_events core_events = {
PW_VERSION_CORE_EVENTS, PW_VERSION_CORE_EVENTS,
.done = core_event_done, .done = core_event_done,
}; };
\endcode \endcode
When the done event is received for an object with id `PW_ID_CORE` When the done event is received for an object with id `PW_ID_CORE` and
and a certain sequence number `seq`, this function will set the done a certain sequence number `seq`, this function will call `pw_main_loop_quit()`.
variable to 1 and call `pw_main_loop_quit()`.
Next we do: Next we do:
@ -68,9 +65,7 @@ We then run the mainloop to send the messages to the server and
receive the events: receive the events:
\code{.c} \code{.c}
while (!done) {
pw_main_loop_run(loop); pw_main_loop_run(loop);
}
\endcode \endcode
When we get the done event, we can compare it to the sync method When we get the done event, we can compare it to the sync method