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glbufferpool: protect release_buffer from multiple concurrent access

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If two different threads attempt to release buffers at the same time, then the
keep-alive-slightly-longer GQueue may become corrupted.  Guard against that with
some locking.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6504>
This commit is contained in:
Matthew Waters 2024-04-02 12:22:33 +11:00 committed by GStreamer Marge Bot
parent 49a7424d1e
commit 3c5bb4bf5d
1 changed files with 29 additions and 4 deletions
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33
subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbufferpool.c
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@ -293,11 +293,19 @@ gst_gl_buffer_pool_stop (GstBufferPool * pool)
GstGLBufferPool *glpool = GST_GL_BUFFER_POOL_CAST (pool);
GstGLBufferPoolPrivate *priv = glpool->priv;
GstBuffer *buffer;
GQueue *free_buffers;
while ((buffer = g_queue_pop_head (priv->free_cache_buffers))) {
GST_OBJECT_LOCK (pool);
free_buffers = priv->free_cache_buffers;
priv->free_cache_buffers = g_queue_new ();
GST_OBJECT_UNLOCK (pool);
while ((buffer = g_queue_pop_head (free_buffers))) {
GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (pool, buffer);
}
g_clear_pointer (&free_buffers, g_queue_free);
return GST_BUFFER_POOL_CLASS (parent_class)->stop (pool);
}
@ -345,18 +353,35 @@ gst_gl_buffer_pool_release_buffer (GstBufferPool * pool, GstBuffer * buffer)
GstGLBufferPool *glpool = GST_GL_BUFFER_POOL_CAST (pool);
GstGLBufferPoolPrivate *priv = glpool->priv;
GST_OBJECT_LOCK (pool);
if (priv->free_queue_min_depth == 0
&& g_queue_get_length (priv->free_cache_buffers) == 0) {
&& g_queue_is_empty (priv->free_cache_buffers)) {
GST_OBJECT_UNLOCK (pool);
GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (pool, buffer);
} else {
GPtrArray *free_buffers = g_ptr_array_new ();
guint q_len = g_queue_get_length (priv->free_cache_buffers);
guint i;
g_queue_push_tail (priv->free_cache_buffers, buffer);
while (g_queue_get_length (priv->free_cache_buffers) >
priv->free_queue_min_depth) {
while (q_len > priv->free_queue_min_depth) {
GstBuffer *release_buffer = g_queue_pop_head (priv->free_cache_buffers);
g_ptr_array_add (free_buffers, release_buffer);
q_len -= 1;
}
GST_OBJECT_UNLOCK (pool);
for (i = 0; i < free_buffers->len; i++) {
GstBuffer *release_buffer = g_ptr_array_index (free_buffers, i);
GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (pool,
release_buffer);
}
g_ptr_array_unref (free_buffers);
}
}