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rcu: init rcu_registry_lock after fork 

We were unlocking this lock after fork, which is wrong since
only the thread that holds a mutex is allowed to unlock it.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1440375847-17603-9-git-send-email-cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emilio G. Cota 2015-08-23 20:23:37 -04:00 committed by Paolo Bonzini
parent 12a1ddc160
commit 5243722376
1 changed files with 6 additions and 1 deletions
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7
util/rcu.c
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@ -335,6 +335,11 @@ static void rcu_init_unlock(void)
qemu_mutex_unlock(&rcu_registry_lock); qemu_mutex_unlock(&rcu_registry_lock);
qemu_mutex_unlock(&rcu_sync_lock); qemu_mutex_unlock(&rcu_sync_lock);
} }
static void rcu_init_child(void)
{
qemu_mutex_init(&rcu_registry_lock);
}
#endif #endif
void rcu_after_fork(void) void rcu_after_fork(void)
@ -346,7 +351,7 @@ void rcu_after_fork(void)
static void __attribute__((__constructor__)) rcu_init(void) static void __attribute__((__constructor__)) rcu_init(void)
{ {
#ifdef CONFIG_POSIX #ifdef CONFIG_POSIX
pthread_atfork(rcu_init_lock, rcu_init_unlock, rcu_init_unlock); pthread_atfork(rcu_init_lock, rcu_init_unlock, rcu_init_child);
#endif #endif
rcu_init_complete(); rcu_init_complete();
} }