1// RUN: %clangxx_tsan %s -o %t
2// RUN: %run %t 2>&1 | FileCheck %s
3
4#include <pthread.h>
5#include <stdlib.h>
6#include <stddef.h>
7#include <unistd.h>
8#include <stdio.h>
9#include <time.h>
10#include <sys/mman.h>
11
12const long kSmallPage = 4 << 10;
13const long kLargePage = 2 << 20;
14
15typedef unsigned long uptr;
16
17int main(int argc, const char **argv) {
18  uptr mem_size = 4 << 20;
19  if (argc > 1)
20    mem_size = (uptr)atoi(argv[1]) << 20;
21  uptr stride = kSmallPage;
22  if (argc > 2)
23    stride = (uptr)atoi(argv[2]) << 10;
24  int niter = 1;
25  if (argc > 3)
26    niter = atoi(argv[3]);
27
28  void *p = mmap(0, mem_size + kLargePage, PROT_READ | PROT_WRITE,
29      MAP_ANON | MAP_PRIVATE, -1, 0);
30  uptr a = ((uptr)p + kLargePage - 1) & ~(kLargePage - 1);
31  volatile char *mem = (volatile char *)a;
32
33  for (int i = 0; i < niter; i++) {
34    for (uptr off = 0; off < mem_size; off += stride)
35      mem[off] = 42;
36  }
37
38  fprintf(stderr, "DONE\n");
39}
40
41// CHECK: DONE
42
43