diff options
Diffstat (limited to 'src/core/lib/iomgr/fork_posix.cc')
-rw-r--r-- | src/core/lib/iomgr/fork_posix.cc | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/fork_posix.cc b/src/core/lib/iomgr/fork_posix.cc new file mode 100644 index 0000000000..a55b3a349a --- /dev/null +++ b/src/core/lib/iomgr/fork_posix.cc @@ -0,0 +1,88 @@ +/* + * + * 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 |