[pulseaudio-discuss] [PATCH RFCv2 18/27] queue: Add pa_queue_peek() function
Peter Meerwald
pmeerw at pmeerw.net
Tue Oct 28 12:46:31 PDT 2014
From: Peter Meerwald <p.meerwald at bct-electronic.com>
gets a pointer to the first entry's data if it exists, NULL
otherwise
Signed-off-by: Peter Meerwald <pmeerw.net>
---
src/pulsecore/queue.c | 11 +++++++++++
src/pulsecore/queue.h | 3 +++
2 files changed, 14 insertions(+)
diff --git a/src/pulsecore/queue.c b/src/pulsecore/queue.c
index f4216ee..de87f33 100644
--- a/src/pulsecore/queue.c
+++ b/src/pulsecore/queue.c
@@ -117,6 +117,17 @@ void* pa_queue_pop(pa_queue *q) {
return p;
}
+const void* pa_queue_peek(pa_queue *q) {
+ struct queue_entry *e;
+
+ pa_assert(q);
+
+ if (!(e = q->front))
+ return NULL;
+
+ return e->data;
+}
+
int pa_queue_isempty(pa_queue *q) {
pa_assert(q);
diff --git a/src/pulsecore/queue.h b/src/pulsecore/queue.h
index 1b95ec8..ebaa148 100644
--- a/src/pulsecore/queue.h
+++ b/src/pulsecore/queue.h
@@ -38,6 +38,9 @@ void pa_queue_free(pa_queue *q, pa_free_cb_t free_func);
void pa_queue_push(pa_queue *q, void *p);
void* pa_queue_pop(pa_queue *q);
+/* Get a pointer to the first entry's data if it exists, NULL otherwise */
+const void* pa_queue_peek(pa_queue *q);
+
int pa_queue_isempty(pa_queue *q);
#endif
--
1.9.1
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