GRPC-C++源码分析（七）--ServerCompletionQueue续

cq = static_cast<grpc_completion_queue*>(
      gpr_zalloc(sizeof(grpc_completion_queue) + vtable->data_size +
                 poller_vtable->size()));

size_t grpc_pollset_size(void) { return grpc_pollset_impl->pollset_size(); }

//ev_posix.cc
  grpc_pollset_vtable grpc_posix_pollset_vtable = {
    pollset_global_init, pollset_global_shutdown,
    pollset_init,        pollset_shutdown,
    pollset_destroy,     pollset_work,
    pollset_kick,        pollset_size};

static size_t pollset_size(void) { return g_event_engine->pollset_size; }

//ev_epollex_linux.cc
static const grpc_event_engine_vtable vtable = {
    sizeof(grpc_pollset),//第一个
    ………………

poller_vtable->init(POLLSET_FROM_CQ(cq), &cq->mu);

vtable->init(DATA_FROM_CQ(cq), shutdown_callback);