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Fix: auto-resize hash table destroy deadlock
[urcu.git]
/
src
/
urcu-call-rcu-impl.h
diff --git
a/src/urcu-call-rcu-impl.h
b/src/urcu-call-rcu-impl.h
index 0c252c12133ed4f3fa1cf7edede849455178569d..c264da5f7775c623d0e9ae952ceed38a8be90add 100644
(file)
--- a/
src/urcu-call-rcu-impl.h
+++ b/
src/urcu-call-rcu-impl.h
@@
-102,7
+102,6
@@
static pthread_mutex_t call_rcu_mutex = PTHREAD_MUTEX_INITIALIZER;
static struct call_rcu_data *default_call_rcu_data;
static struct urcu_atfork *registered_rculfhash_atfork;
static struct call_rcu_data *default_call_rcu_data;
static struct urcu_atfork *registered_rculfhash_atfork;
-static unsigned long registered_rculfhash_atfork_refcount;
/*
* If the sched_getcpu() and sysconf(_SC_NPROCESSORS_CONF) calls are
/*
* If the sched_getcpu() and sysconf(_SC_NPROCESSORS_CONF) calls are
@@
-1018,20
+1017,20
@@
void call_rcu_after_fork_child(void)
void urcu_register_rculfhash_atfork(struct urcu_atfork *atfork)
{
void urcu_register_rculfhash_atfork(struct urcu_atfork *atfork)
{
+ if (CMM_LOAD_SHARED(registered_rculfhash_atfork))
+ return;
call_rcu_lock(&call_rcu_mutex);
call_rcu_lock(&call_rcu_mutex);
- if (registered_rculfhash_atfork_refcount++)
- goto end;
- registered_rculfhash_atfork = atfork;
-end:
+ if (!registered_rculfhash_atfork)
+ registered_rculfhash_atfork = atfork;
call_rcu_unlock(&call_rcu_mutex);
}
call_rcu_unlock(&call_rcu_mutex);
}
+/*
+ * This unregistration function is deprecated, meant only for internal
+ * use by rculfhash.
+ */
+__attribute__((noreturn))
void urcu_unregister_rculfhash_atfork(struct urcu_atfork *atfork __attribute__((unused)))
{
void urcu_unregister_rculfhash_atfork(struct urcu_atfork *atfork __attribute__((unused)))
{
- call_rcu_lock(&call_rcu_mutex);
- if (--registered_rculfhash_atfork_refcount)
- goto end;
- registered_rculfhash_atfork = NULL;
-end:
- call_rcu_unlock(&call_rcu_mutex);
+ urcu_die(EPERM);
}
}
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