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/*
*
* 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 */
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