void __pthread_restart_new(pthread_descr th)
{
/* The barrier is proabably not needed, in which case it still documents
our assumptions. The intent is to commit previous writes to shared
memory so the woken thread will have a consistent view. Complementary
read barriers are present to the suspend functions. */
WRITE_MEMORY_BARRIER();
kill(th->p_pid, __pthread_sig_restart);
}
int sem_post(sem_t * sem)
{
pthread_descr self = thread_self();
pthread_descr th;
#if 0 // AW11
struct pthread_request request;
if (THREAD_GETMEM(self, p_in_sighandler) == NULL)
#endif
{
__pthread_lock(&sem->__sem_lock, self);
if (sem->__sem_waiting == NULL) {
if (sem->__sem_value >= SEM_VALUE_MAX) {
/* Overflow */
__set_errno(ERANGE);
__pthread_unlock(&sem->__sem_lock);
return -1;
}
sem->__sem_value++;
__pthread_unlock(&sem->__sem_lock);
} else {
th = dequeue(&sem->__sem_waiting);
__pthread_unlock(&sem->__sem_lock);
th->p_sem_avail = 1;
WRITE_MEMORY_BARRIER();
restart(th);
}
}
#if 0 // AW11
else {
/* If we're in signal handler, delegate post operation to
the thread manager. */
if (__pthread_manager_request < 0) {
if (__pthread_initialize_manager() < 0) {
__set_errno(EAGAIN);
return -1;
}
}
request.req_kind = REQ_POST;
request.req_args.post = sem;
TEMP_FAILURE_RETRY(write_not_cancel(__pthread_manager_request,
(char *) &request, sizeof(request)));
}
#endif
return 0;
}
int __pthread_once(pthread_once_t * once_control, void (*init_routine)(void))
{
/* flag for doing the condition broadcast outside of mutex */
int state_changed;
/* Test without locking first for speed */
if (*once_control == DONE) {
READ_MEMORY_BARRIER();
return 0;
}
/* Lock and test again */
state_changed = 0;
pthread_mutex_lock(&once_masterlock);
/* If this object was left in an IN_PROGRESS state in a parent
process (indicated by stale generation field), reset it to NEVER. */
if ((*once_control & 3) == IN_PROGRESS && (*once_control & ~3) != fork_generation)
*once_control = NEVER;
/* If init_routine is being called from another routine, wait until
it completes. */
while ((*once_control & 3) == IN_PROGRESS) {
pthread_cond_wait(&once_finished, &once_masterlock);
}
/* Here *once_control is stable and either NEVER or DONE. */
if (*once_control == NEVER) {
*once_control = IN_PROGRESS | fork_generation;
pthread_mutex_unlock(&once_masterlock);
pthread_cleanup_push(pthread_once_cancelhandler, once_control);
init_routine();
pthread_cleanup_pop(0);
pthread_mutex_lock(&once_masterlock);
WRITE_MEMORY_BARRIER();
*once_control = DONE;
state_changed = 1;
}
pthread_mutex_unlock(&once_masterlock);
if (state_changed)
pthread_cond_broadcast(&once_finished);
return 0;
}
