compiler-rt/test/tsan/deep_stack1.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t -DORDER1 && %deflake %run %t | FileCheck %s
   2 // RUN: %clangxx_tsan -O1 %s -o %t -DORDER2 && %deflake %run %t | FileCheck %s
   3 #include "test.h"
   4
   5 volatile int X;
   6 volatile int N;
   7 void (*volatile F)();
   8
   9 static void foo() {
  10   if (--N == 0)
  11     X = 42;
  12   else
  13     F();
  14 }
  15
  16 void *Thread(void *p) {
  17 #ifdef ORDER1
  18   barrier_wait(&barrier);
  19 #endif
  20   F();
  21 #ifdef ORDER2
  22   barrier_wait(&barrier);
  23 #endif
  24   return 0;
  25 }
  26
  27 static size_t RoundUp(size_t n, size_t to) {
  28   return ((n + to - 1) / to) * to;
  29 }
  30
  31 int main() {
  32   barrier_init(&barrier, 2);
  33   N = 50000;
  34   F = foo;
  35   pthread_t t;
  36   pthread_attr_t a;
  37   pthread_attr_init(&a);
  38   size_t stack_size = N * 256 + (1 << 20);
  39   stack_size = RoundUp(stack_size, 0x10000);  // round the stack size to 64k
  40   int ret = pthread_attr_setstacksize(&a, stack_size);
  41   if (ret) abort();
  42   pthread_create(&t, &a, Thread, 0);
  43 #ifdef ORDER2
  44   barrier_wait(&barrier);
  45 #endif
  46   X = 43;
  47 #ifdef ORDER1
  48   barrier_wait(&barrier);
  49 #endif
  50
  51   pthread_join(t, 0);
  52 }
  53
  54 // CHECK: WARNING: ThreadSanitizer: data race
  55 // CHECK:    #100 foo
  56 // We must output sufficiently large stack (at least 100 frames)
  57