compiler-rt/test/sanitizer_common/TestCases/Posix/create_thread_loop2.cpp

   1 // Simple stress test for of pthread_create. Increase arg to use as benchmark.
   2
   3 // RUN: %clangxx -O3 -pthread %s -o %t && %run %t 10
   4
   5 // Crashes on Android.
   6 // UNSUPPORTED: android
   7
   8 #include <cstdint>
   9 #include <pthread.h>
  10 #include <stdlib.h>
  11
  12 extern "C" const char *__asan_default_options() {
  13   // 32bit asan can allocate just a few FakeStacks.
  14   return sizeof(void *) < 8 ? "detect_stack_use_after_return=0" : "";
  15 }
  16
  17 static void *null_func(void *args) { return nullptr; }
  18
  19 static void *loop(void *args) {
  20   uintptr_t n = (uintptr_t)args;
  21   for (int i = 0; i < n; ++i) {
  22     pthread_t thread;
  23     if (pthread_create(&thread, 0, null_func, nullptr) == 0)
  24       pthread_detach(thread);
  25   }
  26   return nullptr;
  27 }
  28
  29 int main(int argc, char **argv) {
  30   uintptr_t n = atoi(argv[1]);
  31   pthread_t threads[64];
  32   for (auto &thread : threads)
  33     while (pthread_create(&thread, 0, loop, (void *)n) != 0) {
  34     }
  35
  36   for (auto &thread : threads)
  37     pthread_join(thread, nullptr);
  38   return 0;
  39 }