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