libgo/misc/cgo/testasan/main.go

   1 // Copyright 2013 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package main
   6
   7 /*
   8 #include <sys/mman.h>
   9 #include <pthread.h>
  10 #include <unistd.h>
  11
  12 void ctor(void) __attribute__((constructor));
  13 static void* thread(void*);
  14
  15 void
  16 ctor(void)
  17 {
  18         // occupy memory where Go runtime would normally map heap
  19         mmap((void*)0x00c000000000, 64<<10, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0);
  20
  21         // allocate 4K every 10us
  22         pthread_t t;
  23         pthread_create(&t, 0, thread, 0);
  24 }
  25
  26 static void*
  27 thread(void *p)
  28 {
  29         for(;;) {
  30                 usleep(10000);
  31                 mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  32         }
  33         return 0;
  34 }
  35 */
  36 import "C"
  37
  38 import (
  39         "time"
  40 )
  41
  42 func main() {
  43         // ensure that we can function normally
  44         var v [][]byte
  45         for i := 0; i < 1000; i++ {
  46                 time.Sleep(10 * time.Microsecond)
  47                 v = append(v, make([]byte, 64<<10))
  48         }
  49 }