compiler-rt/test/tsan/dl_iterate_phdr.cpp

   1 // RUN: %clangxx_tsan -O1 %s -DBUILD_SO -fPIC -shared -o %t-so.so
   2 // RUN: %clangxx_tsan -O1 %s %link_libcxx_tsan -o %t && %run %t 2>&1 | FileCheck %s
   3
   4 // dl_iterate_phdr doesn't exist on OS X.
   5 // UNSUPPORTED: darwin
   6
   7 #ifdef BUILD_SO
   8
   9 #include "test.h"
  10
  11 int exported_var = 0;
  12
  13 #else  // BUILD_SO
  14
  15 #include "test.h"
  16 #include <dlfcn.h>
  17 #include <link.h>
  18 #include <string.h>
  19 #include <string>
  20
  21 static int callback(struct dl_phdr_info *info, size_t size, void *data) {
  22   if (info->dlpi_name[0] == '\0')
  23     info->dlpi_name = "/proc/self/exe";
  24   return !strcmp(info->dlpi_name, "non existent module");
  25 }
  26
  27 void *thread(void *unused) {
  28   for (int i = 0; i < 1000; i++) {
  29     barrier_wait(&barrier);
  30     dl_iterate_phdr(callback, 0);
  31   }
  32   return 0;
  33 }
  34
  35 int main(int argc, char *argv[]) {
  36   barrier_init(&barrier, 2);
  37   std::string path = std::string(argv[0]) + std::string("-so.so");
  38   pthread_t th;
  39   pthread_create(&th, 0, thread, 0);
  40   for (int i = 0; i < 1000; i++) {
  41     barrier_wait(&barrier);
  42     void *lib = dlopen(path.c_str(), RTLD_NOW);
  43     if (!lib) {
  44       printf("error in dlopen: %s\n", dlerror());
  45       return 1;
  46     }
  47     dlclose(lib);
  48   }
  49   pthread_join(th, 0);
  50   fprintf(stderr, "DONE\n");
  51   return 0;
  52 }
  53
  54 #endif  // BUILD_SO
  55
  56 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  57 // CHECK: DONE