| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #include "src/core/lib/iomgr/port.h" |
| |
| #ifdef GRPC_POSIX_FORK |
| |
| #include <string.h> |
| |
| #include <grpc/fork.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/thd.h> |
| #include <grpc/support/useful.h> |
| |
| #include "src/core/lib/iomgr/ev_posix.h" |
| #include "src/core/lib/iomgr/executor.h" |
| #include "src/core/lib/iomgr/timer_manager.h" |
| #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
| #include "src/core/lib/support/env.h" |
| #include "src/core/lib/support/fork.h" |
| #include "src/core/lib/support/thd_internal.h" |
| #include "src/core/lib/surface/init.h" |
| |
| /* |
| * NOTE: FORKING IS NOT GENERALLY SUPPORTED, THIS IS ONLY INTENDED TO WORK |
| * AROUND VERY SPECIFIC USE CASES. |
| */ |
| |
| void grpc_prefork() { |
| if (!grpc_fork_support_enabled()) { |
| gpr_log(GPR_ERROR, |
| "Fork support not enabled; try running with the " |
| "environment variable GRPC_ENABLE_FORK_SUPPORT=1"); |
| return; |
| } |
| if (grpc_is_initialized()) { |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_timer_manager_set_threading(false); |
| grpc_executor_set_threading(&exec_ctx, false); |
| grpc_exec_ctx_finish(&exec_ctx); |
| if (!gpr_await_threads( |
| gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
| gpr_time_from_seconds(3, GPR_TIMESPAN)))) { |
| gpr_log(GPR_ERROR, "gRPC thread still active! Cannot fork!"); |
| } |
| } |
| } |
| |
| void grpc_postfork_parent() { |
| if (grpc_is_initialized()) { |
| grpc_timer_manager_set_threading(true); |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_executor_set_threading(&exec_ctx, true); |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |
| } |
| |
| void grpc_postfork_child() { |
| if (grpc_is_initialized()) { |
| grpc_timer_manager_set_threading(true); |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_executor_set_threading(&exec_ctx, true); |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |
| } |
| |
| void grpc_fork_handlers_auto_register() { |
| if (grpc_fork_support_enabled()) { |
| pthread_atfork(grpc_prefork, grpc_postfork_parent, grpc_postfork_child); |
| } |
| } |
| |
| #endif // GRPC_POSIX_FORK |