Function TEST

test/cpp/fluid/reader/reader_blocking_queue_test.cc:22–26

using paddle::operators::reader::BlockingQueue;

TEST(BlockingQueue, CapacityTest) {
  size_t cap = 10;
  BlockingQueue<int> q(cap);
  EXPECT_EQ(q.Cap(), cap);
}

void FirstInFirstOut(size_t queue_cap,
                     size_t elem_num,