1//===-- sanitizer_stoptheworld_testlib.cc ---------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9// Dynamic library to test StopTheWorld functionality.
10// When loaded with LD_PRELOAD, it will periodically suspend all threads.
11//===----------------------------------------------------------------------===//
12/* Usage:
13clang++ -fno-exceptions -g -fPIC -I. \
14 sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc \
15 sanitizer_common/sanitizer_*.cc -shared -lpthread -o teststoptheworld.so
16LD_PRELOAD=`pwd`/teststoptheworld.so /your/app
17*/
18
19#include "sanitizer_common/sanitizer_platform.h"
20#if SANITIZER_LINUX
21
22#include <dlfcn.h>
23#include <stddef.h>
24#include <stdio.h>
25#include <pthread.h>
26#include <unistd.h>
27
28#include "sanitizer_common/sanitizer_stoptheworld.h"
29
30namespace {
31const uptr kSuspendDuration = 3;
32const uptr kRunDuration = 3;
33
34void Callback(const SuspendedThreadsList &suspended_threads_list,
35              void *argument) {
36  sleep(kSuspendDuration);
37}
38
39void *SuspenderThread(void *argument) {
40  while (true) {
41    sleep(kRunDuration);
42    StopTheWorld(Callback, NULL);
43  }
44  return NULL;
45}
46
47__attribute__((constructor)) void StopTheWorldTestLibConstructor(void) {
48  pthread_t thread_id;
49  pthread_create(&thread_id, NULL, SuspenderThread, NULL);
50}
51}  // namespace
52
53#endif  // SANITIZER_LINUX
54