[GitHub] [arrow] jonkeane commented on a diff in pull request #12558: ARROW-15841: [R] Implement SafeCallIntoR to safely call the R API from another thread

[GitBox <gi...@apache.org>]

jonkeane commented on code in PR #12558:
URL: https://github.com/apache/arrow/pull/12558#discussion_r845100426


##########
r/src/safe-call-into-r-impl.cpp:
##########
@@ -0,0 +1,89 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 "./arrow_types.h"
+#if defined(ARROW_R_WITH_ARROW)
+
+#include <functional>
+#include <thread>
+#include "./safe-call-into-r.h"
+
+MainRThread& GetMainRThread() {
+  static MainRThread main_r_thread;
+  return main_r_thread;
+}
+
+// [[arrow::export]]
+void InitializeMainRThread() { GetMainRThread().Initialize(); }
+
+// [[arrow::export]]
+std::string TestSafeCallIntoR(cpp11::function r_fun_that_returns_a_string,

Review Comment:
   I haven't dug in too much too the code yet, but is this resolved with new commits, or do we still need to find a way to gate this?



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