lib/sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc

   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:
  13 clang++ -fno-exceptions -g -fPIC -I. \
  14  sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc \
  15  sanitizer_common/sanitizer_*.cc -shared -lpthread -o teststoptheworld.so
  16 LD_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
  30 namespace {
  31 const uptr kSuspendDuration = 3;
  32 const uptr kRunDuration = 3;
  33
  34 void Callback(const SuspendedThreadsList &suspended_threads_list,
  35               void *argument) {
  36   sleep(kSuspendDuration);
  37 }
  38
  39 void *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