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-rw-r--r--src/liburing.h2
-rw-r--r--src/setup.c25
2 files changed, 21 insertions, 6 deletions
diff --git a/src/liburing.h b/src/liburing.h
index 623556a..2e7303c 100644
--- a/src/liburing.h
+++ b/src/liburing.h
@@ -56,6 +56,8 @@ extern int io_uring_register(int fd, unsigned int opcode, void *arg,
*/
extern int io_uring_queue_init(unsigned entries, struct io_uring *ring,
unsigned flags);
+extern int io_uring_queue_mmap(int fd, struct io_uring_params *p,
+ struct io_uring *ring);
extern void io_uring_queue_exit(struct io_uring *ring);
extern int io_uring_get_completion(struct io_uring *ring,
struct io_uring_cqe **cqe_ptr);
diff --git a/src/setup.c b/src/setup.c
index eeb5fef..9979dd0 100644
--- a/src/setup.c
+++ b/src/setup.c
@@ -58,13 +58,30 @@ err:
}
/*
+ * For users that want to specify sq_thread_cpu or sq_thread_idle, this
+ * interface is a convenient helper for mmap()ing the rings.
+ * Returns -1 on error, or zero on success. On success, 'ring'
+ * contains the necessary information to read/write to the rings.
+ */
+int io_uring_queue_mmap(int fd, struct io_uring_params *p, struct io_uring *ring)
+{
+ int ret;
+
+ memset(ring, 0, sizeof(*ring));
+ ret = io_uring_mmap(fd, p, &ring->sq, &ring->cq);
+ if (!ret)
+ ring->ring_fd = fd;
+ return ret;
+}
+
+/*
* Returns -1 on error, or zero on success. On success, 'ring'
* contains the necessary information to read/write to the rings.
*/
int io_uring_queue_init(unsigned entries, struct io_uring *ring, unsigned flags)
{
struct io_uring_params p;
- int fd, ret;
+ int fd;
memset(&p, 0, sizeof(p));
p.flags = flags;
@@ -73,11 +90,7 @@ int io_uring_queue_init(unsigned entries, struct io_uring *ring, unsigned flags)
if (fd < 0)
return fd;
- memset(ring, 0, sizeof(*ring));
- ret = io_uring_mmap(fd, &p, &ring->sq, &ring->cq);
- if (!ret)
- ring->ring_fd = fd;
- return ret;
+ return io_uring_queue_mmap(fd, &p, ring);
}
void io_uring_queue_exit(struct io_uring *ring)