compiler-rt/test/tsan/load_shared_lib.cpp

   1 // Check that if the list of shared libraries changes between the two race
   2 // reports, the second report occurring in a new shared library is still
   3 // symbolized correctly.
   4
   5 // RUN: %clangxx_tsan -O1 %s -DBUILD_SO -fPIC -shared -o %t-so.so
   6 // RUN: %clangxx_tsan -O1 %s %link_libcxx_tsan -o %t -rdynamic && %deflake %run %t | FileCheck %s
   7
   8 #ifdef BUILD_SO
   9
  10 #include "test.h"
  11
  12 int GLOB_SHARED = 0;
  13
  14 extern "C"
  15 void init_so() {
  16   barrier_init(&barrier, 2);
  17 }
  18
  19 extern "C"
  20 void *write_from_so(void *unused) {
  21   if (unused == 0)
  22     barrier_wait(&barrier);
  23   GLOB_SHARED++;
  24   if (unused != 0)
  25     barrier_wait(&barrier);
  26   return NULL;
  27 }
  28
  29 #else  // BUILD_SO
  30
  31 #include "test.h"
  32 #include <dlfcn.h>
  33 #include <string>
  34
  35 int GLOB = 0;
  36
  37 void *write_glob(void *unused) {
  38   if (unused == 0)
  39     barrier_wait(&barrier);
  40   GLOB++;
  41   if (unused != 0)
  42     barrier_wait(&barrier);
  43   return NULL;
  44 }
  45
  46 void race_two_threads(void *(*access_callback)(void *unused)) {
  47   pthread_t t1, t2;
  48   pthread_create(&t1, NULL, access_callback, (void*)1);
  49   pthread_create(&t2, NULL, access_callback, NULL);
  50   pthread_join(t1, NULL);
  51   pthread_join(t2, NULL);
  52 }
  53
  54 int main(int argc, char *argv[]) {
  55   barrier_init(&barrier, 2);
  56   std::string path = std::string(argv[0]) + std::string("-so.so");
  57   race_two_threads(write_glob);
  58   // CHECK: write_glob
  59   void *lib = dlopen(path.c_str(), RTLD_NOW);
  60     if (!lib) {
  61     printf("error in dlopen(): %s\n", dlerror());
  62     return 1;
  63   }
  64   void (*init_so)();
  65   *(void **)&init_so = dlsym(lib, "init_so");
  66   init_so();
  67   void *(*write_from_so)(void *unused);
  68   *(void **)&write_from_so = dlsym(lib, "write_from_so");
  69   race_two_threads(write_from_so);
  70   // CHECK: write_from_so
  71   return 0;
  72 }
  73
  74 #endif  // BUILD_SO