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dmeventd: Allocate new thread only when needed

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This commit is contained in:
Marian Csontos 2015-09-22 12:51:49 +02:00
parent 91cd918ae8
commit ead8c23b98
1 changed files with 23 additions and 23 deletions
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46
daemons/dmeventd/dmeventd.c
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@ -1044,33 +1044,33 @@ static int _register_for_event(struct message_data *message_data)
goto out;
}
/* Preallocate thread status struct to avoid deadlock. */
if (!(thread_new = _alloc_thread_status(message_data, dso_data))) {
stack;
ret = -ENOMEM;
goto out;
}
if (!_fill_device_data(thread_new)) {
stack;
ret = -ENODEV;
goto out;
}
/* If creation of timeout thread fails (as it may), we fail
here completely. The client is responsible for either
retrying later or trying to register without timeout
events. However, if timeout thread cannot be started, it
usually means we are so starved on resources that we are
almost as good as dead already... */
if ((thread_new->events & DM_EVENT_TIMEOUT) &&
(ret = -_register_for_timeout(thread_new)))
goto out;
_lock_mutex();
if (!(thread = _lookup_thread_status(message_data))) {
_unlock_mutex();
/* Preallocate thread status struct to avoid deadlock. */
if (!(thread_new = _alloc_thread_status(message_data, dso_data))) {
stack;
ret = -ENOMEM;
goto out;
}
if (!_fill_device_data(thread_new)) {
stack;
ret = -ENODEV;
goto out;
}
/* If creation of timeout thread fails (as it may), we fail
here completely. The client is responsible for either
retrying later or trying to register without timeout
events. However, if timeout thread cannot be started, it
usually means we are so starved on resources that we are
almost as good as dead already... */
if ((thread_new->events & DM_EVENT_TIMEOUT) &&
(ret = -_register_for_timeout(thread_new)))
goto out;
if (!(ret = _do_register_device(thread_new)))
goto out;