ptg10805159438 Thread Control Chapter 12
tip->to_wait.tv_sec--;
tip->to_wait.tv_nsec = SECTONSEC - now.tv_nsec +
when->tv_nsec;
}
err = makethread(timeout_helper, (void *)tip);
if (err == 0)
return;
else
free(tip);
}
}
/*
* We get here if (a) when <= now, or (b) malloc fails, or
*(c) we can’t make a thread, so we just call the function now.
*/
(*func)(arg);
}
pthread_mutexattr_t attr;
pthread_mutex_t mutex;
void
retry(void *arg)
{
pthread_mutex_lock(&mutex);
/* perform retry steps ... */
pthread_mutex_unlock(&mutex);
}
int
main(void)
{
int err, condition, arg;
struct timespec when;
if ((err = pthread_mutexattr_init(&attr)) != 0)
err_exit(err, "pthread_mutexattr_init failed");
if ((err = pthread_mutexattr_settype(&attr,
PTHREAD_MUTEX_RECURSIVE)) != 0)
err_exit(err, "can’t set recursive type");
if ((err = pthread_mutex_init(&mutex, &attr)) != 0)
err_exit(err, "can’t create recursive mutex");
/* continue processing ... */
pthread_mutex_lock(&mutex);
/*
*Check the condition under the protection of a lock to
*make the check and the call to timeout atomic.
*/
if (condition) {
/*