src/compiler-rt/test/tsan/map32bit.cc

   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
  15 // MAP_32BIT doesn't exist on OS X.
  16 // UNSUPPORTED: darwin
  17
  18 void *Thread(void *ptr) {
  19   *(int*)ptr = 42;
  20   barrier_wait(&barrier);
  21   return 0;
  22 }
  23
  24 int main() {
  25   barrier_init(&barrier, 2);
  26   void *ptr = mmap(0, 128 << 10, PROT_READ|PROT_WRITE,
  27       MAP_32BIT|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  28   fprintf(stderr, "ptr=%p\n", ptr);
  29   if (ptr == MAP_FAILED) {
  30     fprintf(stderr, "mmap failed: %d\n", errno);
  31     return 1;
  32   }
  33   if ((uintptr_t)ptr >= (1ull << 32)) {
  34     fprintf(stderr, "ptr is too high\n");
  35     return 1;
  36   }
  37   pthread_t t;
  38   pthread_create(&t, 0, Thread, ptr);
  39   barrier_wait(&barrier);
  40   *(int*)ptr = 42;
  41   pthread_join(t, 0);
  42   munmap(ptr, 128 << 10);
  43   fprintf(stderr, "DONE\n");
  44 }
  45
  46 // CHECK: WARNING: ThreadSanitizer: data race
  47 // CHECK: DONE
  48