compiler-rt/test/tsan/map32bit.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
   2 #include "test.h"
   3 #include <stdint.h>
   4 #include <errno.h>
   5 #include <sys/mman.h>
   6
   7 // Test for issue:
   8 // https://github.com/google/sanitizers/issues/412
   9
  10 // MAP_32BIT flag for mmap is supported only for x86_64.
  11 // XFAIL: mips
  12 // XFAIL: aarch64
  13 // XFAIL: powerpc64
  14 // XFAIL: s390x
  15
  16 // MAP_32BIT doesn't exist on OS X and NetBSD.
  17 // UNSUPPORTED: darwin,netbsd
  18
  19 void *Thread(void *ptr) {
  20   *(int*)ptr = 42;
  21   barrier_wait(&barrier);
  22   return 0;
  23 }
  24
  25 int main() {
  26   barrier_init(&barrier, 2);
  27   void *ptr = mmap(0, 128 << 10, PROT_READ|PROT_WRITE,
  28       MAP_32BIT|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  29   fprintf(stderr, "ptr=%p\n", ptr);
  30   if (ptr == MAP_FAILED) {
  31     fprintf(stderr, "mmap failed: %d\n", errno);
  32     return 1;
  33   }
  34   if ((uintptr_t)ptr >= (1ull << 32)) {
  35     fprintf(stderr, "ptr is too high\n");
  36     return 1;
  37   }
  38   pthread_t t;
  39   pthread_create(&t, 0, Thread, ptr);
  40   barrier_wait(&barrier);
  41   *(int*)ptr = 42;
  42   pthread_join(t, 0);
  43   munmap(ptr, 128 << 10);
  44   fprintf(stderr, "DONE\n");
  45 }
  46
  47 // CHECK: WARNING: ThreadSanitizer: data race
  48 // CHECK: DONE