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 
12 const long kSmallPage = 4 << 10;
13 const long kLargePage = 2 << 20;
14 const long kStride    = 1 << 10;
15 
16 typedef unsigned long uptr;
17 
main(int argc,const char ** argv)18 int main(int argc, const char **argv) {
19   uptr mem_size = 4 << 20;
20   if (argc > 1)
21     mem_size = (uptr)atoi(argv[1]) << 20;
22   uptr stride = kSmallPage;
23   if (argc > 2)
24     stride = (uptr)atoi(argv[2]) << 10;
25   int niter = 1;
26   if (argc > 3)
27     niter = atoi(argv[3]);
28   int stride2 = 1;
29   if (argc > 4)
30     stride2 = atoi(argv[4]);
31 
32   uptr sz = mem_size + stride2 * kStride + kLargePage;
33   void *p = mmap(0, sz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
34   uptr a = ((uptr)p + kLargePage - 1) & ~(kLargePage - 1);
35   volatile char *mem = (volatile char *)a;
36 
37   for (int i = 0; i < niter; i++) {
38     for (uptr off = 0; off < mem_size; off += stride) {
39       for (uptr off2 = 0; off2 < stride2; off2++)
40         mem[off + off2 * kStride] = 42;
41     }
42   }
43 
44   fprintf(stderr, "DONE\n");
45 }
46 
47 // CHECK: DONE
48 
49