Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / src / core / lib / iomgr / fork_posix.cc

diff --git a/legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/fork_posix.cc b/legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/fork_posix.cc
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+++ b/legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/fork_posix.cc
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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/grpc.h>
+#include <grpc/support/log.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"
+
+/*
+ * 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() {
+  skipped_handler = true;
+  // This  may be called after core shuts down, so verify initialized before
+  // instantiating an ExecCtx.
+  if (!grpc_is_initialized()) {
+    return;
+  }
+  grpc_core::ExecCtx exec_ctx;
+  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;
+  }
+  const char* poll_strategy_name = grpc_get_poll_strategy_name();
+  if (poll_strategy_name == nullptr ||
+      (strcmp(poll_strategy_name, "epoll1") != 0 &&
+       strcmp(poll_strategy_name, "poll") != 0)) {
+    gpr_log(GPR_INFO,
+            "Fork support is only compatible with the epoll1 and poll polling "
+            "strategies");
+  }
+  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_core::Executor::SetThreadingAll(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_core::Executor::SetThreadingAll(true);
+  }
+}
+
+void grpc_postfork_child() {
+  if (!skipped_handler) {
+    grpc_core::Fork::AllowExecCtx();
+    grpc_core::ExecCtx exec_ctx;
+    grpc_core::Fork::child_postfork_func reset_polling_engine =
+        grpc_core::Fork::GetResetChildPollingEngineFunc();
+    if (reset_polling_engine != nullptr) {
+      reset_polling_engine();
+    }
+    grpc_timer_manager_set_threading(true);
+    grpc_core::Executor::SetThreadingAll(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