Call _thread_init() from pthread_once() if it has not already been called.

This fixes a segfault in some C++ programs which use exceptions before
main() has been called (i.e. from global constructors).

Reviewed by: deischen

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_once.c b/lib/libpthread/thread/thr_once.c
index ea56d82..d7bb494 100644
--- a/lib/libpthread/thread/thr_once.c
+++ b/lib/libpthread/thread/thr_once.c
@@ -39,6 +39,8 @@ int
 pthread_once(pthread_once_t * once_control, void (*init_routine) (void))
 {
 	if (once_control->state == PTHREAD_NEEDS_INIT) {
+		if (_thread_initial == NULL)
+			_thread_init();
 		pthread_mutex_lock(&(once_control->mutex));
 		if (once_control->state == PTHREAD_NEEDS_INIT) {
 			init_routine();