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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.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_POSIX_FORK
#include <string.h>
#include <grpc/fork.h>
#include <grpc/support/log.h>
#include "src/core/lib/gpr/env.h"
#include "src/core/lib/gprpp/fork.h"
#include "src/core/lib/gprpp/thd.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/surface/init.h"
/*
* NOTE: FORKING IS NOT GENERALLY SUPPORTED, THIS IS ONLY INTENDED TO WORK
* AROUND VERY SPECIFIC USE CASES.
*/
namespace {
bool skipped_handler = true;
bool registered_handlers = false;
} // namespace
void grpc_prefork() {
grpc_core::ExecCtx exec_ctx;
skipped_handler = true;
if (!grpc_is_initialized()) {
return;
}
if (!grpc_core::Fork::Enabled()) {
gpr_log(GPR_ERROR,
"Fork support not enabled; try running with the "
"environment variable GRPC_ENABLE_FORK_SUPPORT=1");
return;
}
if (!grpc_core::Fork::BlockExecCtx()) {
gpr_log(GPR_INFO,
"Other threads are currently calling into gRPC, skipping fork() "
"handlers");
return;
}
grpc_timer_manager_set_threading(false);
grpc_executor_set_threading(false);
grpc_core::ExecCtx::Get()->Flush();
grpc_core::Fork::AwaitThreads();
skipped_handler = false;
}
void grpc_postfork_parent() {
if (!skipped_handler) {
grpc_core::Fork::AllowExecCtx();
grpc_core::ExecCtx exec_ctx;
grpc_timer_manager_set_threading(true);
grpc_executor_set_threading(true);
}
}
void grpc_postfork_child() {
if (!skipped_handler) {
grpc_core::Fork::AllowExecCtx();
grpc_core::ExecCtx exec_ctx;
grpc_timer_manager_set_threading(true);
grpc_executor_set_threading(true);
}
}
void grpc_fork_handlers_auto_register() {
if (grpc_core::Fork::Enabled() & !registered_handlers) {
#ifdef GRPC_POSIX_FORK_ALLOW_PTHREAD_ATFORK
pthread_atfork(grpc_prefork, grpc_postfork_parent, grpc_postfork_child);
registered_handlers = true;
#endif // GRPC_POSIX_FORK_ALLOW_PTHREAD_ATFORK
}
}
#endif // GRPC_POSIX_FORK
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