1 //===-- sanitizer_stoptheworld_testlib.cpp --------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // Dynamic library to test StopTheWorld functionality. 9 // When loaded with LD_PRELOAD, it will periodically suspend all threads. 10 //===----------------------------------------------------------------------===// 11 /* Usage: 12 clang++ -fno-exceptions -g -fPIC -I. \ 13 sanitizer_common/tests/sanitizer_stoptheworld_testlib.cpp \ 14 sanitizer_common/sanitizer_*.cpp -shared -lpthread -o teststoptheworld.so 15 LD_PRELOAD=`pwd`/teststoptheworld.so /your/app 16 */ 17 18 #include "sanitizer_common/sanitizer_platform.h" 19 #if SANITIZER_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 29 namespace { 30 const uptr kSuspendDuration = 3; 31 const uptr kRunDuration = 3; 32 Callback(const SuspendedThreadsList & suspended_threads_list,void * argument)33void Callback(const SuspendedThreadsList &suspended_threads_list, 34 void *argument) { 35 sleep(kSuspendDuration); 36 } 37 SuspenderThread(void * argument)38void *SuspenderThread(void *argument) { 39 while (true) { 40 sleep(kRunDuration); 41 StopTheWorld(Callback, NULL); 42 } 43 return NULL; 44 } 45 StopTheWorldTestLibConstructor(void)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 // SANITIZER_LINUX 53