In blocking mode, if there are no buffers available the DQBUF will block
waiting for a QBUF to be called but it will block holding the streaming
lock which will prevent any QBUF from happening, causing a deadlock.
Can be tested with: v4l2grab -t 1 -b 1 -s 2000
Signed-off-by: Thiago Santos <ts.santos@xxxxxxxxxxxxxxxx>
---
lib/libv4l2/libv4l2.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/libv4l2/libv4l2.c b/lib/libv4l2/libv4l2.c
index c4d69f7..5589fe0 100644
--- a/lib/libv4l2/libv4l2.c
+++ b/lib/libv4l2/libv4l2.c
@@ -290,9 +290,11 @@ static int v4l2_dequeue_and_convert(int index, struct v4l2_buffer *buf,
return result;
do {
+ pthread_mutex_unlock(&devices[index].stream_lock);
result = devices[index].dev_ops->ioctl(
devices[index].dev_ops_priv,
devices[index].fd, VIDIOC_DQBUF, buf);
+ pthread_mutex_lock(&devices[index].stream_lock);
if (result) {
if (errno != EAGAIN) {
int saved_err = errno;
--
2.0.0
--
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