#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

int mode;

static void *thr_function(void *data)
{
   int i;
   pthread_t *p_thrID = data;
   void *mem;

   if (mode == 'd')
      pthread_detach(*p_thrID);

   for (i = 0; i < 10; ++i) {
      mem = malloc(1024*1024);
      sleep(1);
      free(mem);
   }

}

#define N_THR 10

int main(int argc, char *argv[])
{
   pthread_attr_t thrATTR;
   pthread_t thrID[N_THR];
   int i, n;

   if (argc != 2) {
      printf("Usage:\n ./pth_mem <j|d|cd>\n");
      exit(0);
   }
   mode = argv[1][0];

   pthread_attr_init(&thrATTR);
   pthread_attr_setdetachstate(&thrATTR, PTHREAD_CREATE_DETACHED);
   sleep(5);

   for (n = 0; n < 8; ++n) {
      for (i = 0; i < N_THR; ++i) {
         if (mode == 'c')
            pthread_create(&thrID[i], &thrATTR, thr_function, &thrID[i]);
         else
            pthread_create(&thrID[i], NULL, thr_function, &thrID[i]);
      }
      if (mode == 'j') {
         for (i = 0; i < N_THR; ++i)
            pthread_join(thrID[i], NULL);
         sleep(5);
      } else {
         sleep(15);
      }
   }
   pthread_attr_destroy(&thrATTR);
   return 0;
}