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Diffstat (limited to 'nptl/pthread_mutex_unlock.c')
-rw-r--r--nptl/pthread_mutex_unlock.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/nptl/pthread_mutex_unlock.c b/nptl/pthread_mutex_unlock.c
index 95ae9337c8..8064de09c1 100644
--- a/nptl/pthread_mutex_unlock.c
+++ b/nptl/pthread_mutex_unlock.c
@@ -158,6 +158,10 @@ __pthread_mutex_unlock_full (pthread_mutex_t *mutex, int decr)
       THREAD_SETMEM (THREAD_SELF, robust_head.list_op_pending, NULL);
       break;
 
+    /* The PI support requires the Linux futex system call.  If that's not
+       available, pthread_mutex_init should never have allowed the type to
+       be set.  So it will get the default case for an invalid type.  */
+#ifdef __NR_futex
     case PTHREAD_MUTEX_PI_RECURSIVE_NP:
       /* Recursive mutex.  */
       if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid))
@@ -245,6 +249,7 @@ __pthread_mutex_unlock_full (pthread_mutex_t *mutex, int decr)
 
       THREAD_SETMEM (THREAD_SELF, robust_head.list_op_pending, NULL);
       break;
+#endif  /* __NR_futex.  */
 
     case PTHREAD_MUTEX_PP_RECURSIVE_NP:
       /* Recursive mutex.  */