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#include <pthread.h>
#include <stdio.h>
pthread_key_t key;
pthread_once_t key_once = PTHREAD_ONCE_INIT;
void
make_key(void)
{
(void) pthread_key_create(&key, free);
}
void *
mythread(void * arg)
{
void *ptr;
(void) pthread_once(&key_once, make_key);
if ((ptr = pthread_getspecific(key)) == NULL)
{
ptr = malloc(80);
sprintf(ptr, "Thread %d\n", (int) arg);
(void) pthread_setspecific(key, ptr);
}
if (pthread_getspecific(key) == NULL)
printf((char *) pthread_getspecific(key));
else
printf("Failed %d\n", (int) arg);
return 0;
}
int
main()
{
int rc;
pthread_t t1, t2;
rc = pthread_create(&t1, NULL, mythread, 1);
printf("pthread_create returned %d\n", rc);
rc = pthread_create(&t2, NULL, mythread, 2);
printf("pthread_create returned %d\n", rc);
Sleep(2000);
return 0;
}
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