[TSan] Add a regression test for https://code.google.com/p/thread-sanitizer/issues/detail?id=47

llvm-svn: 200923

compiler-rt/lib/tsan/lit_tests/getline_nohang.cc

@@ -0,0 +1,28 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && TSAN_OPTIONS=report_thread_leaks=0 %t
+
+// Make sure TSan doesn't deadlock on a file stream lock at program shutdown.
+// See https://code.google.com/p/thread-sanitizer/issues/detail?id=47
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+void *thread(void *unused) {
+  char *line = NULL;
+  size_t size;
+  int fd[2];
+  pipe(fd);
+  // Forge a non-standard stream to make sure it's not closed.
+  FILE *stream = fdopen(fd[0], "r");
+  while (1) {
+    volatile int res = getline(&line, &size, stream);
+    (void)res;
+  }
+  return NULL;
+}
+
+int main() {
+  pthread_t t;
+  pthread_create(&t, NULL, thread, NULL);
+  return 0;
+  // ThreadSanitizer used to hang here because of a deadlock on a file stream.
+}