From: Ulrich Drepper <drepper@redhat.com>
Date: Mon, 19 Feb 2001 18:47:27 +0000 (+0000)
Subject: (__pthread_lock): Force lock->__status to be read from memory on every spin.
X-Git-Tag: cvs/glibc-2_2_3~372
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b99a3ee2223e29059b00616365625cc9c55a362e;p=thirdparty%2Fglibc.git

(__pthread_lock): Force lock->__status to be read from memory on every spin.
---

diff --git a/linuxthreads/spinlock.c b/linuxthreads/spinlock.c
index 63f2ed16932..f284b580d25 100644
--- a/linuxthreads/spinlock.c
+++ b/linuxthreads/spinlock.c
@@ -88,6 +88,7 @@ again:
 	  return;
 	}
       }
+      __asm __volatile ("" : "=m" (lock->__status) : "0" (lock->__status));
     }
 
     lock->__spinlock += (spin_count - lock->__spinlock) / 8;