Page History

#include <threads.h>
#include <stdlib.h>

/* Global key to the thread-specific data. */
tss_t key;
enum { MAX_THREADS = 3 };

int *get_data(void) {
  int *arr = (int *)malloc(2 * sizeof(int));
  if (arr == NULL) {
    return arr;  /* Indicate... ErrorOther functions */
  }
  arr[0] = 10;
  arr[1] = 42;
  return arr;
}

int add_data(void) {
  int *data = get_data();
  if (data == NULL) {
    return -1;	/* Indicate error */
  }

  if (thrd_success != tss_set(key, (void *)data)) {
    /* Handle Error */
  }
  return 0;
}

void print_data(void) {
  /* Get this thread's global data from key. */
  int *data = tss_get(key);

  if (data != NULL) {
   /* Print data. */
  } 
}

int function(void *dummy) {
  if (add_data() != 0) {
    return -1;	/* Indicate error */
  }
  print_data();
  return 0;
}
 
void destructor(void *data) {
  free(data)are unchanged. */
void* destructor(void *data) {
  free(data);
  return 0;
}
 
int main(void) {
  thrd_t thread_id[MAX_THREADS];

  /* Create the key before creating the threads. */
  if (thrd_success != tss_create(&key, destructor)) {
    /* Handle Error */
  }

  /* Create threads that would store specific data. */
  for (i = 0; i < MAX_THREADS; i++) {
    if (thrd_success != thrd_create(&thread_id[i], function, NULL)) {
      /* Handle Error */
    }
  }

  for (int i = 0; i < MAX_THREADS; i++) {
    if (thrd_success != thrd_join(thread_id[i], NULL)) {
      /* Handle Error */
    }
  }

  tss_delete(key);
  return 0;
}