X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=io_u_queue.h;h=118e59342b5da4bd814be51aa7f561d519603838;hp=4f6e8e6a703b573e8f5c0d3e24fa397e090008e2;hb=e39c0676d1af779004194ae4b3cc111db49bef7a;hpb=2ae0b204743d6b4048c6fffd46c6280a70f2ecd1

diff --git a/io_u_queue.h b/io_u_queue.h
index 4f6e8e6a..118e5934 100644
--- a/io_u_queue.h
+++ b/io_u_queue.h
@@ -8,28 +8,39 @@ struct io_u;
 struct io_u_queue {
 	struct io_u **io_us;
 	unsigned int nr;
+	unsigned int max;
 };
 
 static inline struct io_u *io_u_qpop(struct io_u_queue *q)
 {
-	if (q->nr)
-		return q->io_us[--q->nr];
+	if (q->nr) {
+		const unsigned int next = --q->nr;
+		struct io_u *io_u = q->io_us[next];
+
+		q->io_us[next] = NULL;
+		return io_u;
+	}
 
 	return NULL;
 }
 
 static inline void io_u_qpush(struct io_u_queue *q, struct io_u *io_u)
 {
-	q->io_us[q->nr++] = io_u;
+	if (q->nr < q->max) {
+		q->io_us[q->nr++] = io_u;
+		return;
+	}
+
+	assert(0);
 }
 
-static inline int io_u_qempty(struct io_u_queue *q)
+static inline int io_u_qempty(const struct io_u_queue *q)
 {
 	return !q->nr;
 }
 
 #define io_u_qiter(q, io_u, i)	\
-	for (i = 0, io_u = (q)->io_us[0]; i < (q)->nr; i++, io_u = (q)->io_us[i])
+	for (i = 0; i < (q)->nr && (io_u = (q)->io_us[i]); i++)
 
 int io_u_qinit(struct io_u_queue *q, unsigned int nr);
 void io_u_qexit(struct io_u_queue *q);