| /* |
| * |
| * Copyright 2017 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_LIB_GPRPP_FORK_H |
| #define GRPC_CORE_LIB_GPRPP_FORK_H |
| |
| /* |
| * NOTE: FORKING IS NOT GENERALLY SUPPORTED, THIS IS ONLY INTENDED TO WORK |
| * AROUND VERY SPECIFIC USE CASES. |
| */ |
| |
| namespace grpc_core { |
| |
| namespace internal { |
| class ExecCtxState; |
| class ThreadState; |
| } // namespace internal |
| |
| class Fork { |
| public: |
| typedef void (*child_postfork_func)(void); |
| |
| static void GlobalInit(); |
| static void GlobalShutdown(); |
| |
| // Returns true if fork suppport is enabled, false otherwise |
| static bool Enabled(); |
| |
| // Increment the count of active ExecCtxs. |
| // Will block until a pending fork is complete if one is in progress. |
| static void IncExecCtxCount(); |
| |
| // Decrement the count of active ExecCtxs |
| static void DecExecCtxCount(); |
| |
| // Provide a function that will be invoked in the child's postfork handler to |
| // reset the polling engine's internal state. |
| static void SetResetChildPollingEngineFunc( |
| child_postfork_func reset_child_polling_engine); |
| static child_postfork_func GetResetChildPollingEngineFunc(); |
| |
| // Check if there is a single active ExecCtx |
| // (the one used to invoke this function). If there are more, |
| // return false. Otherwise, return true and block creation of |
| // more ExecCtx s until AlloWExecCtx() is called |
| // |
| static bool BlockExecCtx(); |
| static void AllowExecCtx(); |
| |
| // Increment the count of active threads. |
| static void IncThreadCount(); |
| |
| // Decrement the count of active threads. |
| static void DecThreadCount(); |
| |
| // Await all core threads to be joined. |
| static void AwaitThreads(); |
| |
| // Test only: overrides environment variables/compile flags |
| // Must be called before grpc_init() |
| static void Enable(bool enable); |
| |
| private: |
| static internal::ExecCtxState* exec_ctx_state_; |
| static internal::ThreadState* thread_state_; |
| static bool support_enabled_; |
| static bool override_enabled_; |
| static child_postfork_func reset_child_polling_engine_; |
| }; |
| |
| } // namespace grpc_core |
| |
| #endif /* GRPC_CORE_LIB_GPRPP_FORK_H */ |