lldb/test/Shell/Register/Core/Inputs/multithread.cpp

   1 // This program is used to generate a core dump for testing multithreading
   2 // support.
   3
   4 #include <atomic>
   5 #include <chrono>
   6 #include <cstdint>
   7 #include <thread>
   8
   9 std::atomic_int start_counter{3};
  10
  11 void pseudobarrier_wait() {
  12   start_counter--;
  13   while (start_counter > 0);
  14 }
  15
  16 void fcommon(uint32_t a, uint32_t b, uint32_t c, uint32_t d, double fa, double fb, double fc, double fd, bool segv) {
  17   if (segv) {
  18     int *foo = nullptr;
  19     *foo = 0;
  20   }
  21   while (1);
  22 }
  23
  24 void f1() {
  25   volatile uint32_t a = 0x01010101;
  26   volatile uint32_t b = 0x02020202;
  27   volatile uint32_t c = 0x03030303;
  28   volatile uint32_t d = 0x04040404;
  29   volatile double fa = 2.0;
  30   volatile double fb = 4.0;
  31   volatile double fc = 8.0;
  32   volatile double fd = 16.0;
  33
  34   pseudobarrier_wait();
  35   std::this_thread::sleep_for(std::chrono::milliseconds(200));
  36   fcommon(a, b, c, d, fa, fb, fc, fd, true);
  37 }
  38
  39 void f2() {
  40   volatile uint32_t a = 0x11111111;
  41   volatile uint32_t b = 0x12121212;
  42   volatile uint32_t c = 0x13131313;
  43   volatile uint32_t d = 0x14141414;
  44   volatile double fa = 3.0;
  45   volatile double fb = 6.0;
  46   volatile double fc = 9.0;
  47   volatile double fd = 12.0;
  48
  49   pseudobarrier_wait();
  50   fcommon(a, b, c, d, fa, fb, fc, fd, false);
  51 }
  52
  53 void f3() {
  54   volatile uint32_t a = 0x21212121;
  55   volatile uint32_t b = 0x22222222;
  56   volatile uint32_t c = 0x23232323;
  57   volatile uint32_t d = 0x24242424;
  58   volatile double fa = 5.0;
  59   volatile double fb = 10.0;
  60   volatile double fc = 15.0;
  61   volatile double fd = 20.0;
  62
  63   pseudobarrier_wait();
  64   fcommon(a, b, c, d, fa, fb, fc, fd, false);
  65 }
  66
  67 int main() {
  68   std::thread t1{f1};
  69   std::thread t2{f2};
  70   std::thread t3{f3};
  71
  72   t3.join();
  73   t2.join();
  74   t1.join();
  75
  76   return 0;
  77 }