Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/lldb/unittests/tools/lldb-server/inferior/environment_check.cpp

@@ -0,0 +1,20 @@
+//===-- thread_inferior.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <string>
+#include <cstdlib>
+
+int main() {
+  const char *value = std::getenv("LLDB_TEST_MAGIC_VARIABLE");
+  if (!value)
+    return 1;
+  if (std::string(value) != "LLDB_TEST_MAGIC_VALUE")
+    return 2;
+  return 0;
+}

external/llvm-project/lldb/unittests/tools/lldb-server/inferior/thread_inferior.cpp

@@ -0,0 +1,41 @@
+//===-- thread_inferior.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <atomic>
+#include <chrono>
+#include <string>
+#include <thread>
+#include <vector>
+
+int main(int argc, char* argv[]) {
+  int thread_count = 2;
+  if (argc > 1) {
+    thread_count = std::stoi(argv[1], nullptr, 10);
+  }
+
+  std::atomic<bool> delay(true);
+  std::vector<std::thread> threads;
+  for (int i = 0; i < thread_count; i++) {
+    threads.push_back(std::thread([&delay] {
+      while (delay.load())
+        std::this_thread::sleep_for(std::chrono::seconds(1));
+    }));
+  }
+
+  // Cause a break.
+  volatile char *p = NULL;
+  *p = 'a';
+
+  delay.store(false);
+  for (std::thread& t : threads) {
+    t.join();
+  }
+
+  return 0;
+}