lib/tsan/output_tests/simple_stack2.cc

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

int Global;

void __attribute__((noinline)) foo1() {
  Global = 42;
}

void __attribute__((noinline)) bar1() {
  volatile int tmp = 42; int tmp2 = tmp; (void)tmp2;
  foo1();
}

void __attribute__((noinline)) foo2() {
  volatile int tmp = Global; int tmp2 = tmp; (void)tmp2;
}

void __attribute__((noinline)) bar2() {
  volatile int tmp = 42; int tmp2 = tmp; (void)tmp2;
  foo2();
}

void *Thread1(void *x) {
  usleep(1000000);
  bar1();
  return NULL;
}

int main() {
  pthread_t t;
  pthread_create(&t, NULL, Thread1, NULL);
  bar2();
  pthread_join(t, NULL);
}

// CHECK:      WARNING: ThreadSanitizer: data race
// CHECK-NEXT:   Write of size 4 at {{.*}} by thread 1:
// CHECK-NEXT:     #0 foo1{{.*}} {{.*}}simple_stack2.cc:8 ({{.*}})
// CHECK-NEXT:     #1 bar1{{.*}} {{.*}}simple_stack2.cc:13 ({{.*}})
// CHECK-NEXT:     #2 Thread1{{.*}} {{.*}}simple_stack2.cc:27 ({{.*}})
// CHECK-NEXT:   Previous read of size 4 at {{.*}} by main thread:
// CHECK-NEXT:     #0 foo2{{.*}} {{.*}}simple_stack2.cc:17 ({{.*}})
// CHECK-NEXT:     #1 bar2{{.*}} {{.*}}simple_stack2.cc:22 ({{.*}})
// CHECK-NEXT:     #2 main{{.*}} {{.*}}simple_stack2.cc:34 ({{.*}})