Back to index

glibc  2.9
Defines | Functions
tst-mutex4.c File Reference
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include "../test-skeleton.c"
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Defines

#define TIMEOUT   4
#define TEST_FUNCTION   do_test ()

Functions

static int do_test (void)

Define Documentation

#define TEST_FUNCTION   do_test ()

Definition at line 277 of file tst-mutex4.c.

#define TIMEOUT   4

Definition at line 276 of file tst-mutex4.c.


Function Documentation

static int do_test ( void  ) [static]

Definition at line 32 of file tst-mutex4.c.

{
  size_t ps = sysconf (_SC_PAGESIZE);
  char tmpfname[] = "/tmp/tst-mutex4.XXXXXX";
  char data[ps];
  void *mem;
  int fd;
  pthread_mutex_t *m;
  pthread_mutexattr_t a;
  pid_t pid;
  char *p;
  int err;
  int s;
  pthread_barrier_t *b;
  pthread_barrierattr_t ba;

  fd = mkstemp (tmpfname);
  if (fd == -1)
    {
      printf ("cannot open temporary file: %m\n");
      return 1;
    }

  /* Make sure it is always removed.  */
  unlink (tmpfname);

  /* Create one page of data.  */
  memset (data, '\0', ps);

  /* Write the data to the file.  */
  if (write (fd, data, ps) != (ssize_t) ps)
    {
      puts ("short write");
      return 1;
    }

  mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (mem == MAP_FAILED)
    {
      printf ("mmap failed: %m\n");
      return 1;
    }

  m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t) - 1)
                        & ~(__alignof (pthread_mutex_t) - 1));
  b = (pthread_barrier_t *) (((uintptr_t) (m + 1)
                           + __alignof (pthread_barrier_t) - 1)
                          & ~(__alignof (pthread_barrier_t) - 1));
  p = (char *) (b + 1);

  if (pthread_mutexattr_init (&a) != 0)
    {
      puts ("mutexattr_init failed");
      return 1;
    }

  if (pthread_mutexattr_getpshared (&a, &s) != 0)
    {
      puts ("1st mutexattr_getpshared failed");
      return 1;
    }

  if (s != PTHREAD_PROCESS_PRIVATE)
    {
      puts ("default pshared value wrong");
      return 1;
    }

  if (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
    {
      puts ("mutexattr_setpshared failed");
      return 1;
    }

  if (pthread_mutexattr_getpshared (&a, &s) != 0)
    {
      puts ("2nd mutexattr_getpshared failed");
      return 1;
    }

  if (s != PTHREAD_PROCESS_SHARED)
    {
      puts ("pshared value after setpshared call wrong");
      return 1;
    }

#ifdef ENABLE_PI
  if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
    {
      puts ("pthread_mutexattr_setprotocol failed");
      return 1;
    }
#endif

  if ((err = pthread_mutex_init (m, &a)) != 0)
    {
#ifdef ENABLE_PI
      if (err == ENOTSUP)
       {
         puts ("PI mutexes unsupported");
         return 0;
       }
#endif
      puts ("mutex_init failed");
      return 1;
    }

  if (pthread_mutex_lock (m) != 0)
    {
      puts ("mutex_lock failed");
      return 1;
    }

  if (pthread_mutexattr_destroy (&a) != 0)
    {
      puts ("mutexattr_destroy failed");
      return 1;
    }

  if (pthread_barrierattr_init (&ba) != 0)
    {
      puts ("barrierattr_init failed");
      return 1;
    }

  if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
    {
      puts ("barrierattr_setpshared failed");
      return 1;
    }

  if (pthread_barrier_init (b, &ba, 2) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  if (pthread_barrierattr_destroy (&ba) != 0)
    {
      puts ("barrierattr_destroy failed");
      return 1;
    }

  err = pthread_mutex_trylock (m);
  if (err == 0)
    {
      puts ("mutex_trylock succeeded");
      return 1;
    }
  else if (err != EBUSY)
    {
      puts ("mutex_trylock didn't return EBUSY");
      return 1;
    }

  *p = 0;

  if (pthread_mutex_unlock (m) != 0)
    {
      puts ("parent: 1st mutex_unlock failed");
      return 1;
    }

  puts ("going to fork now");
  pid = fork ();
  if (pid == -1)
    {
      puts ("fork failed");
      return 1;
    }
  else if (pid == 0)
    {
      if (pthread_mutex_lock (m) != 0)
       {
         puts ("child: mutex_lock failed");
         return 1;
       }

      int e = pthread_barrier_wait (b);
      if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
       {
         puts ("child: barrier_wait failed");
         return 1;
       }

      if ((*p)++ != 0)
       {
         puts ("child: *p != 0");
         return 1;
       }

      if (pthread_mutex_unlock (m) != 0)
       {
         puts ("child: mutex_unlock failed");
         return 1;
       }

      puts ("child done");
    }
  else
    {
      int e = pthread_barrier_wait (b);
      if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
       {
         puts ("parent: barrier_wait failed");
         return 1;
       }

      if (pthread_mutex_lock (m) != 0)
       {
         puts ("parent: 2nd mutex_lock failed");
         return 1;
       }

      if (*p != 1)
       {
         puts ("*p != 1");
         return 1;
       }

      if (pthread_mutex_unlock (m) != 0)
       {
         puts ("parent: 2nd mutex_unlock failed");
         return 1;
       }

      if (pthread_mutex_destroy (m) != 0)
       {
         puts ("mutex_destroy failed");
         return 1;
       }

      if (pthread_barrier_destroy (b) != 0)
       {
         puts ("barrier_destroy failed");
         return 1;
       }

      puts ("parent done");
    }

  return 0;
}

Here is the call graph for this function: