linuxthreads/Examples/ex17.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <pthread.h>
   5 #include <unistd.h>
   6 #include <limits.h>
   7 #include <sys/mman.h>
   8
   9 static pthread_mutex_t synch = PTHREAD_MUTEX_INITIALIZER;
  10
  11 static void *
  12 test_thread (void *v_param)
  13 {
  14   pthread_mutex_lock (&synch);
  15   return NULL;
  16 }
  17
  18 #define STACKSIZE 0x100000
  19
  20 int
  21 main (void)
  22 {
  23   pthread_t thread;
  24   pthread_attr_t attr;
  25   int status;
  26   void *stack, *stack2;
  27   size_t stacksize;
  28
  29   pthread_attr_init (&attr);
  30   stack = mmap (NULL, STACKSIZE,
  31                 PROT_READ | PROT_WRITE | PROT_EXEC,
  32                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  33
  34   if (stack == MAP_FAILED)
  35     {
  36       perror ("mmap failed");
  37       return 1;
  38     }
  39
  40   status = pthread_attr_setstack (&attr, stack, STACKSIZE);
  41   if (status != 0)
  42     {
  43       printf ("pthread_attr_setstack failed: %s\n", strerror (status));
  44       return 1;
  45     }
  46
  47   status = pthread_attr_getstack (&attr, &stack2, &stacksize);
  48   if (status != 0)
  49     {
  50       printf ("pthread_attr_getstack failed: %s\n", strerror (status));
  51       return 1;
  52     }
  53
  54   if (stack2 != stack || stacksize != STACKSIZE)
  55     {
  56       printf ("first pthread_attr_getstack returned different stack (%p,%zx)\n"
  57               "than was set by setstack (%p,%x)\n",
  58               stack2, stacksize, stack, STACKSIZE);
  59       return 2;
  60     }
  61
  62   status = pthread_mutex_lock (&synch);
  63   if (status != 0)
  64     {
  65       printf ("cannot get lock: %s\n", strerror (status));
  66       return 1;
  67     }
  68
  69   status = pthread_create (&thread, &attr, test_thread, NULL);
  70   if (status != 0)
  71     {
  72       printf ("pthread_create failed: %s\n", strerror (status));
  73       return 1;
  74     }
  75
  76   status = pthread_getattr_np (thread, &attr);
  77   if (status != 0)
  78     {
  79       printf ("pthread_getattr_np failed: %s\n", strerror (status));
  80       return 1;
  81     }
  82
  83   status = pthread_attr_getstack (&attr, &stack2, &stacksize);
  84   if (status != 0)
  85     {
  86       printf ("pthread_attr_getstack failed: %s\n", strerror (status));
  87       return 1;
  88     }
  89
  90   if (stack2 != stack || stacksize != STACKSIZE)
  91     {
  92       printf ("second pthread_attr_getstack returned different stack (%p,%zx)\n"
  93               "than was set by setstack (%p,%x)\n",
  94               stack2, stacksize, stack, STACKSIZE);
  95       return 3;
  96     }
  97
  98   status = pthread_mutex_unlock (&synch);
  99   if (status != 0)
 100     {
 101       printf ("cannot release lock: %s\n", strerror (status));
 102       return 1;
 103     }
 104
 105   /* pthread_detach (thread); */
 106   if (pthread_join (thread, NULL) != 0)
 107     {
 108       printf ("join failed\n");
 109       return 1;
 110     }
 111   return 0;
 112 }