Example: Setting a thread attribute in a Pthread program

/*
Filename: ATEST10.QCSRC
The output of this example is as follows:
 Enter Testcase - LIBRARY/ATEST10
 Create a default thread attributes object
 Set the detach state thread attribute
 Create a thread using the new attributes
 Destroy thread attributes object
 Join now fails because the detach state attribute was changed
 Entered the thread
 Main completed
*/
#define _MULTI_THREADED
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
#define checkResults(string, val) {             \
 if (val) {                                     \
   printf("Failed with %d at %s", val, string); \
   exit(1);                                     \
 }                                              \
}
 
void *theThread(void *parm)
{
   printf("Entered the thread\n");
   return NULL;
}
 
int main(int argc, char **argv)
{
  pthread_attr_t        attr;
  pthread_t             thread;
  int                   rc=0;
 
  printf("Enter Testcase - %s\n", argv[0]);
 
  printf("Create a default thread attributes object\n");
  rc = pthread_attr_init(&attr);
  checkResults("pthread_attr_init()\n", rc);
 
  printf("Set the detach state thread attribute\n");
  rc = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  checkResults("pthread_attr_setdetachstate()\n", rc);
 
  printf("Create a thread using the new attributes\n");
  rc = pthread_create(&thread, &attr, theThread, NULL);
  checkResults("pthread_create()\n", rc);
 
  printf("Destroy thread attributes object\n");
  rc = pthread_attr_destroy(&attr);
  checkResults("pthread_attr_destroy()\n", rc);
 
  printf("Join now fails because the detach state attribute was changed\n");
  rc = pthread_join(thread, NULL);
  if (rc==0) {
     printf("Unexpected results from pthread_join()\n");
     exit(1);
  }
  sleep(2);
 
  printf("Main completed\n");
  return 0;
}