1  #include <dlfcn.h>
       2  #include <pthread.h>
       3  #include <stdio.h>
       4  #include <stdlib.h>
       5  #include <string.h>
       6  #include <gnu/lib-names.h>
       7  
       8  static void *
       9  tf (void *arg)
      10  {
      11    void *h = dlopen (LIBM_SO, RTLD_LAZY);
      12    if (h == NULL)
      13      {
      14        printf ("dlopen failed: %s\n", dlerror ());
      15        exit (1);
      16      }
      17    if (dlsym (h, "sin") == NULL)
      18      {
      19        printf ("dlsym failed: %s\n", dlerror ());
      20        exit (1);
      21      }
      22    if (dlclose (h) != 0)
      23      {
      24        printf ("dlclose failed: %s\n", dlerror ());
      25        exit (1);
      26      }
      27    return NULL;
      28  }
      29  
      30  
      31  static int
      32  do_test (void)
      33  {
      34  #define N 10
      35    pthread_t th[N];
      36    for (int i = 0; i < N; ++i)
      37      {
      38        int e = pthread_create (&th[i], NULL, tf, NULL);
      39        if (e != 0)
      40  	{
      41  	  printf ("pthread_create failed with %d (%s)\n", e, strerror (e));
      42  	  return 1;
      43  	}
      44      }
      45    for (int i = 0; i < N; ++i)
      46      {
      47        void *res;
      48        int e = pthread_join (th[i], &res);
      49        if (e != 0 || res != NULL)
      50  	{
      51  	  puts ("thread failed");
      52  	  return 1;
      53  	}
      54      }
      55    return 0;
      56  }
      57  
      58  #include <support/test-driver.c>