static int engine_list_remove(ENGINE *e)
{
ENGINE *iterator;
if (e == NULL) {
ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* We need to check that e is in our linked list! */
iterator = engine_list_head;
while (iterator && (iterator != e))
iterator = iterator->next;
if (iterator == NULL) {
ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
ENGINE_R_ENGINE_IS_NOT_IN_LIST);
return 0;
}
/* un-link e from the chain. */
if (e->next)
e->next->prev = e->prev;
if (e->prev)
e->prev->next = e->next;
/* Correct our head/tail if necessary. */
if (engine_list_head == e)
engine_list_head = e->next;
if (engine_list_tail == e)
engine_list_tail = e->prev;
engine_free_util(e, 0);
return 1;
}
/*
* Free a functional reference to a engine type. This version is only used
* internally.
*/
int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
{
int to_return = 1;
/*
* Reduce the functional reference count here so if it's the terminating
* case, we can release the lock safely and call the finish() handler
* without risk of a race. We get a race if we leave the count until
* after and something else is calling "finish" at the same time -
* there's a chance that both threads will together take the count from 2
* to 0 without either calling finish().
*/
e->funct_ref--;
engine_ref_debug(e, 1, -1);
if ((e->funct_ref == 0) && e->finish) {
if (unlock_for_handlers)
CRYPTO_THREAD_unlock(global_engine_lock);
to_return = e->finish(e);
if (unlock_for_handlers)
CRYPTO_THREAD_write_lock(global_engine_lock);
if (!to_return)
return 0;
}
REF_ASSERT_ISNT(e->funct_ref < 0);
/* Release the structural reference too */
if (!engine_free_util(e, 0)) {
ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH, ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}
int ENGINE_free(ENGINE *e)
{
return engine_free_util(e, 1);
}
