1 files changed, 53 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc
new file mode 100644
index 000000000000..d8be2afb19e9
--- /dev/null
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc
@@ -0,0 +1,53 @@
+//===-- sanitizer_stoptheworld_testlib.cc ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Dynamic library to test StopTheWorld functionality.
+// When loaded with LD_PRELOAD, it will periodically suspend all threads.
+//===----------------------------------------------------------------------===//
+/* Usage:
+clang++ -fno-exceptions -g -fPIC -I. \
+ sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc \
+ sanitizer_common/sanitizer_*.cc -shared -lpthread -o teststoptheworld.so
+LD_PRELOAD=`pwd`/teststoptheworld.so /your/app
+*/
+
+#include "sanitizer_common/sanitizer_platform.h"
+#if SANITIZER_LINUX
+
+#include <dlfcn.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <pthread.h>
+#include <unistd.h>
+
+#include "sanitizer_common/sanitizer_stoptheworld.h"
+
+namespace {
+const uptr kSuspendDuration = 3;
+const uptr kRunDuration = 3;
+
+void Callback(const SuspendedThreadsList &suspended_threads_list,
+              void *argument) {
+  sleep(kSuspendDuration);
+}
+
+void *SuspenderThread(void *argument) {
+  while (true) {
+    sleep(kRunDuration);
+    StopTheWorld(Callback, NULL);
+  }
+  return NULL;
+}
+
+__attribute__((constructor)) void StopTheWorldTestLibConstructor(void) {
+  pthread_t thread_id;
+  pthread_create(&thread_id, NULL, SuspenderThread, NULL);
+}
+}  // namespace
+
+#endif  // SANITIZER_LINUX