async::TaskResult use conditional_variable. (reverted from commit 7d0fa7fbb83677d62ad1f14f72ce0916a6747e50)
async::TaskResult use conditional_variable. (reverted from commit 7d0fa7fbb83677d62ad1f14f72ce0916a6747e50)

dariadb/dariadb,lysevi/dariadb,lysevi/dariadb,dariadb/dariadb,lysevi/dariadb