49 lines · cpp
1// RUN: %clangxx_tsan %s -o %t2// RUN: %run %t 2>&1 | FileCheck %s3 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;14const long kStride = 1 << 10;15 16typedef unsigned long uptr;17 18int 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: DONE48 49