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GitOrigin-RevId: bb059a0721c92e8154d33ce8057b3915a25b3d7d

mediapipe/gpu/gl_texture_buffer.cc

@@ -161,15 +161,18 @@ void GlTextureBuffer::Reuse() {
   // sync fences; with a single-threaded executor, that means switching to
   // each of those contexts, grabbing its mutex. Let's do that after releasing
   // our own mutex.
+  // Likewise, if we don't have sync fences and are simulating them, WaitOnGpu
+  // will also require invoking the consumer context, so we should not call it
+  // while holding the mutex.
   std::unique_ptr<GlMultiSyncPoint> old_consumer_sync;
   {
     absl::MutexLock lock(&consumer_sync_mutex_);
-    consumer_multi_sync_->WaitOnGpu();
     // Reset the sync points.
     old_consumer_sync = std::move(consumer_multi_sync_);
     consumer_multi_sync_ = absl::make_unique<GlMultiSyncPoint>();
     producer_sync_ = nullptr;
   }
+  old_consumer_sync->WaitOnGpu();
 }
 
 void GlTextureBuffer::Updated(std::shared_ptr<GlSyncPoint> prod_token) {