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Fix: Lock FD tracker across fork
[lttng-ust.git]
/
liblttng-ust
/
lttng-ust-comm.c
diff --git
a/liblttng-ust/lttng-ust-comm.c
b/liblttng-ust/lttng-ust-comm.c
index 26c2e2907bcfdd9701dda4c7575432fdd1e33523..8b03125e28646701801cbed5b207e4c3d5fb5801 100644
(file)
--- a/
liblttng-ust/lttng-ust-comm.c
+++ b/
liblttng-ust/lttng-ust-comm.c
@@
-81,6
+81,8
@@
static int initialized;
*
* ust_lock nests within the dynamic loader lock (within glibc) because
* it is taken within the library constructor.
*
* ust_lock nests within the dynamic loader lock (within glibc) because
* it is taken within the library constructor.
+ *
+ * The ust fd tracker lock nests within the ust_mutex.
*/
static pthread_mutex_t ust_mutex = PTHREAD_MUTEX_INITIALIZER;
*/
static pthread_mutex_t ust_mutex = PTHREAD_MUTEX_INITIALIZER;
@@
-2024,6
+2026,7
@@
void ust_before_fork(sigset_t *save_sigset)
ust_lock_nocheck();
rcu_bp_before_fork();
ust_lock_nocheck();
rcu_bp_before_fork();
+ lttng_ust_lock_fd_tracker();
}
static void ust_after_fork_common(sigset_t *restore_sigset)
}
static void ust_after_fork_common(sigset_t *restore_sigset)
@@
-2031,6
+2034,7
@@
static void ust_after_fork_common(sigset_t *restore_sigset)
int ret;
DBG("process %d", getpid());
int ret;
DBG("process %d", getpid());
+ lttng_ust_unlock_fd_tracker();
ust_unlock();
pthread_mutex_unlock(&ust_fork_mutex);
ust_unlock();
pthread_mutex_unlock(&ust_fork_mutex);
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