chore: checkpoint before Python removal

vendor/aws-lc-sys/aws-lc/crypto/rwlock_static_init.cc

@@ -0,0 +1,43 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0 OR ISC
+
+// This test attempts to setup a potential race condition that can cause the
+// first use of an rwlock to fail when initialized using
+// PTHREAD_RWLOCK_INITIALIZER.
+// See: https://sourceforge.net/p/mingw-w64/bugs/883/
+
+#include <openssl/rand.h>
+
+#include <cstdint>
+#include <iostream>
+#include <thread>
+#include <cassert>
+#include <cstdlib>
+
+static void thread_task_rand(bool *myFlag) {
+  uint8_t buf[16];
+  if(1 == RAND_bytes(buf, sizeof(buf))) {
+    *myFlag = true;
+  }
+}
+
+int main(int _argc, char** _argv) {
+  constexpr size_t kNumThreads = 16;
+  bool myFlags[kNumThreads] = {};
+  std::thread myThreads[kNumThreads];
+
+  for (size_t i = 0; i < kNumThreads; i++) {
+    bool* myFlag = &myFlags[i];
+    myThreads[i] = std::thread(thread_task_rand, myFlag);
+  }
+  for (size_t i = 0; i < kNumThreads; i++) {
+    myThreads[i].join();
+    if(!myFlags[i]) {
+      std::cerr << "Thread " << i << " failed." << std::endl;
+      exit(1);
+      return 1;
+    }
+  }
+  std::cout << "PASS" << std::endl;
+  return 0;
+}