sanitizer_stoptheworld_testlib.cc revision 3614c16084e8a0dc8ae3418402a2d0c6f8107e39 
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#ifdef __linux__
20
21#include <dlfcn.h>
22#include <stddef.h>
23#include <stdio.h>
24#include <pthread.h>
25#include <unistd.h>
26
27#include "sanitizer_common/sanitizer_stoptheworld.h"
28
29namespace {
30const uptr kSuspendDuration = 3;
31const uptr kRunDuration = 3;
32
33void Callback(const SuspendedThreadsList &suspended_threads_list,
34              void *argument) {
35  sleep(kSuspendDuration);
36}
37
38void *SuspenderThread(void *argument) {
39  while (true) {
40    sleep(kRunDuration);
41    StopTheWorld(Callback, NULL);
42  }
43  return NULL;
44}
45
46__attribute__((constructor)) void StopTheWorldTestLibConstructor(void) {
47  pthread_t thread_id;
48  pthread_create(&thread_id, NULL, SuspenderThread, NULL);
49}
50}  // namespace
51
52#endif  // __linux__
53