From 184ee94010786a9e0952aff3af39eba1d72287d3 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@hack.frob.com>
Date: Fri, 17 Oct 2014 14:30:16 -0700
Subject: NPTL: Conditionalize direct futex syscall uses.

---
 nptl/pthread_mutex_trylock.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'nptl/pthread_mutex_trylock.c')

diff --git a/nptl/pthread_mutex_trylock.c b/nptl/pthread_mutex_trylock.c
index 0867b06533..0293d0f629 100644
--- a/nptl/pthread_mutex_trylock.c
+++ b/nptl/pthread_mutex_trylock.c
@@ -191,6 +191,10 @@ __pthread_mutex_trylock (mutex)
 
       return 0;
 
+    /* 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:
     case PTHREAD_MUTEX_PI_ERRORCHECK_NP:
     case PTHREAD_MUTEX_PI_NORMAL_NP:
@@ -319,6 +323,7 @@ __pthread_mutex_trylock (mutex)
 
 	return 0;
       }
+#endif  /* __NR_futex.  */
 
     case PTHREAD_MUTEX_PP_RECURSIVE_NP:
     case PTHREAD_MUTEX_PP_ERRORCHECK_NP:
-- 
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