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pulse: Add pa_operation_set_state_callback() API

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[The original commit message didn't have any explanation why this
change is made, so I'll add that information here myself.
--Tanu Kaskinen]

This change is from the developers of a Haskell binding[1]. According
to them, this change isn't strictly necessary, but their code gets
significantly cleaner if they can register an operation callback that
is called when the operation is cancelled due to the context getting
disconnected.

[1] https://github.com/favonia/pulse
This commit is contained in:
Paul Meng 2013-01-07 21:41:26 +08:00 • committed by Tanu Kaskinen
parent b1e47df72c
commit a255c29344
4 changed files with 30 additions and 0 deletions
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20
src/pulse/operation.c
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@ -26,6 +26,7 @@
#include <pulse/xmalloc.h>
#include <pulsecore/macro.h>
#include <pulsecore/flist.h>
#include <pulse/fork-detect.h>
#include "internal.h"
#include "operation.h"
@ -91,6 +92,8 @@ static void operation_unlink(pa_operation *o) {
o->stream = NULL;
o->callback = NULL;
o->userdata = NULL;
o->state_callback = NULL;
o->state_userdata = NULL;
}
static void operation_set_state(pa_operation *o, pa_operation_state_t st) {
@ -104,6 +107,9 @@ static void operation_set_state(pa_operation *o, pa_operation_state_t st) {
o->state = st;
if (o->state_callback)
o->state_callback(o, o->state_userdata);
if ((o->state == PA_OPERATION_DONE) || (o->state == PA_OPERATION_CANCELED))
operation_unlink(o);
@ -130,3 +136,17 @@ pa_operation_state_t pa_operation_get_state(pa_operation *o) {
return o->state;
}
void pa_operation_set_state_callback(pa_operation *o, pa_operation_notify_cb_t cb, void *userdata) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
if (pa_detect_fork())
return;
if (o->state == PA_OPERATION_DONE || o->state == PA_OPERATION_CANCELED)
return;
o->state_callback = cb;
o->state_userdata = userdata;
}