src/core/lib/iomgr/event_engine/iomgr.cc

   1 // Copyright 2021 The gRPC Authors
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 #include <grpc/support/port_platform.h>
  15
  16 #ifdef GRPC_USE_EVENT_ENGINE
  17 #include <grpc/event_engine/event_engine.h>
  18
  19 #include "src/core/lib/debug/trace.h"
  20 #include "src/core/lib/iomgr/closure.h"
  21 #include "src/core/lib/iomgr/event_engine/iomgr.h"
  22 #include "src/core/lib/iomgr/iomgr_internal.h"
  23 #include "src/core/lib/iomgr/tcp_client.h"
  24 #include "src/core/lib/iomgr/tcp_server.h"
  25 #include "src/core/lib/iomgr/timer.h"
  26 #include "src/core/lib/surface/init.h"
  27
  28 extern grpc_tcp_client_vtable grpc_event_engine_tcp_client_vtable;
  29 extern grpc_tcp_server_vtable grpc_event_engine_tcp_server_vtable;
  30 extern grpc_timer_vtable grpc_event_engine_timer_vtable;
  31 extern grpc_pollset_vtable grpc_event_engine_pollset_vtable;
  32 extern grpc_pollset_set_vtable grpc_event_engine_pollset_set_vtable;
  33 extern grpc_address_resolver_vtable grpc_event_engine_resolver_vtable;
  34
  35 // Disabled by default. grpc_polling_trace must be defined in all iomgr
  36 // implementations due to its usage in lockfree_event.
  37 grpc_core::DebugOnlyTraceFlag grpc_polling_trace(false, "polling");
  38
  39 namespace {
  40
  41 using ::grpc_event_engine::experimental::DefaultEventEngineFactory;
  42 using ::grpc_event_engine::experimental::EventEngine;
  43
  44 EventEngine* g_event_engine = nullptr;
  45
  46 // TODO(nnoble): Instantiate the default EventEngine if none have been provided.
  47 void iomgr_platform_init(void) { GPR_ASSERT(g_event_engine != nullptr); }
  48
  49 void iomgr_platform_flush(void) {}
  50
  51 void iomgr_platform_shutdown(void) {
  52   delete g_event_engine;
  53   g_event_engine = nullptr;
  54 }
  55
  56 void iomgr_platform_shutdown_background_closure(void) {}
  57
  58 bool iomgr_platform_is_any_background_poller_thread(void) {
  59   return g_event_engine->IsWorkerThread();
  60 }
  61
  62 bool iomgr_platform_add_closure_to_background_poller(
  63     grpc_closure* /* closure */, grpc_error* /* error */) {
  64   return false;
  65 }
  66
  67 grpc_iomgr_platform_vtable vtable = {
  68     iomgr_platform_init,
  69     iomgr_platform_flush,
  70     iomgr_platform_shutdown,
  71     iomgr_platform_shutdown_background_closure,
  72     iomgr_platform_is_any_background_poller_thread,
  73     iomgr_platform_add_closure_to_background_poller};
  74
  75 }  // namespace
  76
  77 void grpc_set_default_iomgr_platform() {
  78   grpc_set_tcp_client_impl(&grpc_event_engine_tcp_client_vtable);
  79   grpc_set_tcp_server_impl(&grpc_event_engine_tcp_server_vtable);
  80   grpc_set_timer_impl(&grpc_event_engine_timer_vtable);
  81   grpc_set_pollset_vtable(&grpc_event_engine_pollset_vtable);
  82   grpc_set_pollset_set_vtable(&grpc_event_engine_pollset_set_vtable);
  83   grpc_set_resolver_impl(&grpc_event_engine_resolver_vtable);
  84   grpc_set_iomgr_platform_vtable(&vtable);
  85 }
  86
  87 bool grpc_iomgr_run_in_background() { return false; }
  88
  89 grpc_event_engine::experimental::EventEngine* grpc_iomgr_event_engine() {
  90   return g_event_engine;
  91 }
  92
  93 namespace grpc_core {
  94
  95 void SetDefaultEventEngine(
  96     std::unique_ptr<grpc_event_engine::experimental::EventEngine>
  97         event_engine) {
  98   GPR_ASSERT(g_event_engine == nullptr);
  99   g_event_engine = event_engine.release();
 100 }
 101
 102 }  // namespace grpc_core
 103
 104 #endif  // GRPC_USE_EVENT_ENGINE