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glibc  2.9
Defines | Functions | Variables
tst-fork1.c File Reference
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>

Go to the source code of this file.

Defines

#define N   5

Functions

static void * thread_function (void *arg)
int main (void)

Variables

static const int t [N] = { 7, 6, 5, 4, 3 }

Define Documentation

#define N   5

Definition at line 65 of file tst-fork1.c.


Function Documentation

int main ( void  )

Definition at line 69 of file tst-fork1.c.

{
  pthread_t th[N];
  int i;
  int result = 0;
  pthread_attr_t at;

  if (pthread_attr_init (&at) != 0)
    {
      puts ("attr_init failed");
      return 1;
    }

  if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
    {
      puts ("attr_setstacksize failed");
      return 1;
    }

  for (i = 0; i < N; ++i)
    if (pthread_create (&th[i], NULL, thread_function,
                     (void *) (intptr_t) t[i]) != 0)
      {
       printf ("creation of thread %d failed\n", i);
       exit (1);
      }

  if (pthread_attr_destroy (&at) != 0)
    {
      puts ("attr_destroy failed");
      return 1;
    }

  for (i = 0; i < N; ++i)
    {
      void *v;
      if (pthread_join (th[i], &v) != 0)
       {
         printf ("join of thread %d failed\n", i);
         result = 1;
       }
      else if (v != NULL)
       {
         printf ("join %d successful, but child failed\n", i);
         result = 1;
       }
      else
       printf ("join %d successful\n", i);
    }

  return result;
}

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static void* thread_function ( void *  arg) [static]

Definition at line 29 of file tst-fork1.c.

{
  int i = (intptr_t) arg;
  int status;
  pid_t pid;
  pid_t pid2;

  pid = fork ();
  switch (pid)
    {
    case 0:
      printf ("%ld for %d\n", (long int) getpid (), i);
      struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 * i };
      nanosleep (&ts, NULL);
      _exit (i);
      break;
    case -1:
      printf ("fork: %m\n");
      return (void *) 1l;
      break;
    }

  pid2 = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
  if (pid2 != pid)
    {
      printf ("waitpid returned %ld, expected %ld\n",
             (long int) pid2, (long int) pid);
      return (void *) 1l;
    }

  printf ("%ld with %d, expected %d\n",
         (long int) pid, WEXITSTATUS (status), i);

  return WEXITSTATUS (status) == i ? NULL : (void *) 1l;
}

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Variable Documentation

const int t[N] = { 7, 6, 5, 4, 3 } [static]

Definition at line 66 of file tst-fork1.c.